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Academic lineage

Possible advisorsa guess from early papers, not confirmed

  • Subhasis Chaudhuri

    Possible advisor · last author on 5 of their early first-author papers, 1995–1999

    Suggested from co-authorship

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Works245 from public data

TitleCited by
  • Identification of Humans Using Gait

    Amit A. Kale, Aravind Sundaresan, Ambasamudram Narayanan Rajagopalan, Naresh P. Cuntoor, Amit K. Roy–Chowdhury, Volker Krüger, Rama Chellappa

    IEEE Transactions on Image Processing · 2004

    647
  • Spatially-Attentive Patch-Hierarchical Network for Adaptive Motion Deblurring

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2020

    This work proposes an efficient pixel adaptive and feature attentive design for handling large blur variations across different spatial locations and proposes an effective content-aware global-local filtering module that significantly improves performance by considering not only global dependencies but also by dynamically exploiting neighboring pixel information.

    336
  • Depth From Defocus: A Real Aperture Imaging Approach

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    A Partial Derivatives of Various Quantities in CRB, a MAP-MRF approach to Depth Recovery and Restoration using MRF Models.

    265
  • Gait Analysis for Human Identification

    Amit A. Kale, Naresh P. Cuntoor, B. Yegnanarayana, Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    Lecture notes in computer science · 2003

    The dynamic time-warping (DTW) approach is used for matching so that non-linear time normalization may be used to deal with the naturally-occuring changes in walking speed.

    256
  • Gait-based recognition of humans using continuous HMMs

    Amit A. Kale, Ambasamudram Narayanan Rajagopalan, Naresh P. Cuntoor, Volker Krüger

    Proceedings of Fifth IEEE International Conference on Automatic Face Gesture Recognition · 2003

    226
  • Off-line signature verification using DTW

    Piyush Shanker Agram, Ambasamudram Narayanan Rajagopalan

    Pattern Recognition Letters · 2007

    A signature verification system based on Dynamic Time Warping (DTW) that works by extracting the vertical projection feature from signature images and by comparing reference and probe feature templates using elastic matching is proposed.

    209
  • Super-Resolution of Face Images Using Kernel PCA-Based Prior

    Ayan Chakrabarti, Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    IEEE Transactions on Multimedia · 2007

    191
  • Spatially-Adaptive Image Restoration using Distortion-Guided Networks

    Kuldeep Purohit, Maitreya Suin, Ambasamudram Narayanan Rajagopalan, Vishnu Naresh Boddeti

    IEEE/CVF International Conference on Computer Vision (ICCV) · 2021

    The key idea is to exploit the non-uniformity of heavy degradations in spatial-domain and suitably embed this knowledge within distortion-guided modules performing sparse normalization, feature extraction and attention.

    166
  • PIRM Challenge on Perceptual Image Enhancement on Smartphones: Report

    Andrey Ignatov, Radu Timofte, Thang Vu, Tung M. Luu, Trung X. Pham, Cao Van Nguyen, Yongwoo Kim, Jae-Seok Choi, +22 more

    Lecture notes in computer science · 2019

    This paper reviews the first challenge on efficient perceptual image enhancement with the focus on deploying deep learning models on smartphones and proposes solutions that significantly improved baseline results defining the state-of-the-art for image enhancement on smartphones.

    161
  • Region-Adaptive Dense Network for Efficient Motion Deblurring

    Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    AAAI Publications (The Association for the Advancement of Artificial Intelligence (AAAI)) · 2020

    This paper presents a new architecture composed of region adaptive dense deformable modules that implicitly discover the spatially varying shifts responsible for non-uniform blur in the input image and learn to modulate the filters, enabling almost real-time deblurring.

    148
  • Blur-Invariant Deep Learning for Blind-Deblurring

    Nimisha Thekke Madam, Akash Kumar Singh, Ambasamudram Narayanan Rajagopalan

    IEEE International Conference on Computer Vision (ICCV) · 2017

    148
  • Depth estimation and image restoration using defocused stereo pairs

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri, Uma Mudenagudi

    IEEE Transactions on Pattern Analysis and Machine Intelligence · 2004

    148
  • Superresolution of License Plates in Real Traffic Videos

    Kaggere V. Suresh, G. Mahesh Kumar, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Intelligent Transportation Systems · 2007

    131
  • Finding faces in photographs

    Ambasamudram Narayanan Rajagopalan, K. Sunil Kumar, Jayashree Karlekar, R. Manivasakan, M.M. Patil, U.B. Desai, P.G. Poonacha, Syomantak Chaudhuri

    International Conference on Computer Vision · 2002

    112
  • An MRF model-based approach to simultaneous recovery of depth and restoration from defocused images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    IEEE Transactions on Pattern Analysis and Machine Intelligence · 1999

    The performance of the proposed MAP-Markov random field based scheme for recovering the depth and the focused image of a scene from two defocused images is found to be better than that of the existing window-based depth from defocus technique.

    106
  • AIM 2020 Challenge on Efficient Super-Resolution: Methods and Results

    Kai Zhang, Martin Danelljan, Yawei Li, Radu Timofte, Jie Liu, Jie Tang, Gangshan Wu, Yu Michael Zhu, +22 more

    Institutional Research Information System (University of Udine) · 2020

    The AIM 2020 challenge on efficient single image super-resolution was to super-resolve an input image with a magnification factor x4 based on a set of prior examples of low and corresponding high resolution images with focus on the proposed solutions and results.

    101
  • Bringing Alive Blurred Moments

    Kuldeep Purohit, Anshul Shah, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2019

    This work first learns motion representation from sharp videos in an unsupervised manner through training of a convolutional recurrent video autoencoder network that performs a surrogate task of video reconstruction that outperforms competing methods across all factors: accuracy, speed, and compactness.

    92
  • Human Face Detection in Cluttered Color Images Using Skin Color, Edge Information.

    K. Sandeep, Ambasamudram Narayanan Rajagopalan

    Indian Conference on Computer Vision, Graphics and Image Processing · 2002

    A fast algorithm for detecting human faces in color images using color histogram for skin (in the HSV space) in conjunction with edge information to quickly locate faces in a given image is proposed.

    80
  • Non-uniform Motion Deblurring for Bilayer Scenes

    Paramanand Chandramouli, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2013

    75
  • Higher order statistical learning for vehicle detection in images

    Ambasamudram Narayanan Rajagopalan, Philippe Burlina, Rama Chellappa

    IEEE International Conference on Computer Vision (ICCV) · 1999

    74
  • Unrolling the Shutter: CNN to Correct Motion Distortions

    Vijay Rengarajan, Yogesh Balaji, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2017

    73
  • Non-blind Deblurring: Handling Kernel Uncertainty with CNNs

    Subeesh Vasu, Venkatesh Reddy Maligireddy, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2018

    69
  • NTIRE 2019 Image Dehazing Challenge Report

    Codruta Orniana Ancuti, Cosmin Ancuți, Radu Timofte, Luc Van Gool, Lei Zhang, Ming–Hsuan Yang, Tiantong Guo, Xuelu Li, +22 more

    IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2019

    68
  • Face Recognition Across Non-Uniform Motion Blur, Illumination, and Pose

    Abhijith Punnappurath, Ambasamudram Narayanan Rajagopalan, Sima Taheri, Rama Chellappa, Guna S. Seetharaman

    IEEE Transactions on Image Processing · 2015

    68
  • A variational approach to recovering depth from defocused images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    IEEE Transactions on Pattern Analysis and Machine Intelligence · 1997

    A smoothness constraint is imposed on the estimates of the blur parameter, and a variational approach to the DFD problem is developed using the space-frequency representation (SFR) framework.

    67
  • Analyzing Perception-Distortion Tradeoff Using Enhanced Perceptual Super-Resolution Network

    Subeesh Vasu, Nimisha Thekke Madam, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2019

    The proposed network, called enhanced perceptual super-resolution network (EPSR), is trained with a combination of mean squared error loss, perceptual loss, and adversarial loss and achieves the state-of-the-art trade-off between distortion and perceptual quality while the existing methods perform well in either of these measures alone.

    63
  • Unsupervised Class-Specific Deblurring

    Nimisha Thekke Madam, Sunil Kumar, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2018

    An end-to-end deblurring network designed specifically for a class of data that learns a strong prior on the clean image domain using adversarial loss and maps the blurred image to its clean equivalent and imposes a scale-space gradient error with an additional gradient module.

    63
  • From Bows to Arrows: Rolling Shutter Rectification of Urban Scenes

    Vijay Rengarajan, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2016

    62
  • Depth From Motion and Optical Blur With an Unscented Kalman Filter

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2011

    59
  • Resolution Enhancement of PMD Range Maps

    Ambasamudram Narayanan Rajagopalan, Arnav V. Bhavsar, Frank Wallhoff, Gerhard Rigoll

    Lecture notes in computer science · 2008

    This work follows a Bayesian framework by modeling the original HR range as a Markov random field (MRF) and proposes the use of an edge-adaptive MRF prior to handle discontinuities.

    59
  • AIM 2019 Challenge on Image Demoireing: Methods and Results

    Shanxin Yuan, Radu Timofte, Greg Slabaugh, Aleš Leonardis, Bolun Zheng, Xin Ye, Xiang Tian, Yaowu Chen, +20 more

    2019 IEEE/CVF International Conference on Computer Vision Workshop (ICCVW) · 2019

    This paper reviews the first-ever image demoireing challenge that was part of the Advances in Image Manipulation (AIM) workshop, held in conjunction with ICCV 2019, and focuses on the proposed solutions and their results.

    57
  • Resolution Enhancement in Multi-Image Stereo

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Pattern Analysis and Machine Intelligence · 2010

    55
  • Vehicle detection and tracking in video

    Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    Proceedings - International Conference on Image Processing · 2002

    53
  • Space-Variant Approaches to Recovery of Depth from Defocused Images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    Computer Vision and Image Understanding · 1997

    The first approach proposed here models the DFD system as a block shift-variant one and incorporates the interaction of blur among neighboring subimages in an attempt to improve the estimate of the depth.

    53
  • AIM 2020 Challenge on Rendering Realistic Bokeh

    Andrey Ignatov, Radu Timofte, Ming Qian, Congyu Qiao, Jiamin Lin, Zhenyu Guo, Chenghua Li, Cong Leng, +22 more

    Lecture notes in computer science · 2020

    The proposed solutions significantly improved the baseline results, defining the state-of-the-art for practical bokeh effect rendering problem.

    52
  • Combined face and gait recognition using alpha matte preprocessing

    Martin Rudolf Hofmann, Stephan M. Schmidt, Ambasamudram Narayanan Rajagopalan, Gerhard Rigoll

    2012 5th IAPR International Conference on Biometrics (ICB) · 2012

    52
  • Self-supervised Monocular Underwater Depth Recovery, Image Restoration, and a Real-sea Video Dataset

    Nisha Varghese, Ashish Kumar, Ambasamudram Narayanan Rajagopalan

    IEEE/CVF International Conference on Computer Vision (ICCV) · 2023

    50
  • Gated Spatio-Temporal Attention-Guided Video Deblurring

    Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2021

    50
  • AIM 2020: Scene Relighting and Illumination Estimation Challenge

    Majed El Helou, Ruofan Zhou, Sabine E. Susstrunk, Radu Timofte, Mahmoud Afifi, Michael S. Brown, Kele Xu, Hengxing Cai, +22 more

    Lecture notes in computer science · 2020

    The novel VIDIT dataset used in the AIM 2020 challenge and the different proposed solutions and final evaluation results over the 3 challenge tracks are presented.

    50
  • An Efficient Framework for Dense Video Captioning

    Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    Proceedings of the AAAI Conference on Artificial Intelligence · 2020

    This paper proposes a deep reinforcement-based approach which enables an agent to describe multiple events in a video by watching a portion of the frames, and reduces the computational cost by processing fewer frames while maintaining accuracy.

    50
  • Optimal selection of camera parameters for recovery of depth from defocused images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2002

    49
  • NTIRE 2019 Challenge on Video Super-Resolution: Methods and Results

    Seungjun Nah, Radu Timofte, Shuhang Gu, Sungyong Baik, Seokil Hong, Gyeongsik Moon, Sanghyun Son, Kyoung Mu Lee, +22 more

    IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2019

    45
  • Occlusion-Aware Rolling Shutter Rectification of 3D Scenes

    Subeesh Vasu, Mahesh Mohan M.R., Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2018

    45
  • Harnessing Motion Blur to Unveil Splicing

    M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    IEEE Transactions on Information Forensics and Security · 2014

    44
  • Distillation-guided Image Inpainting

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    IEEE/CVF International Conference on Computer Vision (ICCV) · 2021

    43
  • Range map superresolution-inpainting, and reconstruction from sparse data

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    Computer Vision and Image Understanding · 2012

    This work uses multiple relatively-shifted LR range images, where the motion between the LR images serves as a cue for super-resolution, and exploits a cue from segmentation of an optical image of the same scene, which constrains pixels in the same color segment to have similar range values.

    43
  • Improving Shape From Focus Using Defocus Cue

    K. Pradeep, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2007

    43
  • AIM 2019 Challenge on Bokeh Effect Synthesis: Methods and Results

    Andrey Ignatov, Jagruti Patel, Radu Timofte, Bolun Zheng, Xin Ye, Li Huang, Xiang Tian, Saikat Dutta, +22 more

    2019 IEEE/CVF International Conference on Computer Vision Workshop (ICCVW) · 2019

    41
  • NTIRE 2019 Challenge on Video Deblurring: Methods and Results

    Seungjun Nah, Radu Timofte, Sungyong Baik, Seokil Hong, Gyeongsik Moon, Sanghyun Son, Kyoung Mu Lee, Xintao Wang, +22 more

    IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2019

    38
  • NTIRE 2025 Challenge on Day and Night Raindrop Removal for Dual-Focused Images: Methods and Results

    Xin Li, Yeying Jin, Xin Jin, Zongwei Wu, Bing Li, Yufei Wang, Wenhan Yang, Yu Li, +22 more

    IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2025

    This paper reviews the NTIRE 2025 Challenge on Day and Night Raindrop Removal for Dual-Focused Images to establish a new and powerful benchmark for the task of removing raindrops under varying lighting and focus conditions.

    37
  • Robust and computationally efficient superresolution algorithm

    Kaggere V. Suresh, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2007

    The proposed method not only preserves edges but also lends robustness to errors in the estimates of motion and blur parameters and uses theoretically the neighborhood structure for the posterior distribution in the presence of warping, blurring, and downsampling operations to effectively reduce the overall computations.

    37
  • Depth-Guided Dense Dynamic Filtering Network for Bokeh Effect Rendering

    Kuldeep Purohit, Maitreya Suin, Praveen Kandula, Ambasamudram Narayanan Rajagopalan

    2019 IEEE/CVF International Conference on Computer Vision Workshop (ICCVW) · 2019

    34
  • A Recursive Filter for Despeckling SAR Images

    G. R. K. S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    IEEE Transactions on Image Processing · 2008

    33
  • Motion-free superresolution and the role of relative blur

    Ambasamudram Narayanan Rajagopalan, V. Phani Kiran

    Journal of the Optical Society of America A · 2003

    This work examines the theory of motion-free superresolution and derives analytical expressions in the discrete Fourier transform domain for obtaining a superresolved image from its blurred and downsampled versions and addresses the effect of relative blurring among the defocused observations on the quality of the reconstructed image.

    33
  • AIM 2019 Challenge on Image Extreme Super-Resolution: Methods and Results

    Shuhang Gu, Martin Danelljan, Radu Timofte, Muhammad Haris, Kazutoshi Akita, Greg Shakhnarovic, Norimichi Ukita, Pablo Navarrete Michelini, +22 more

    2019 IEEE/CVF International Conference on Computer Vision Workshop (ICCVW) · 2019

    32
  • Background learning for robust face recognition with PCA in the presence of clutter

    Ambasamudram Narayanan Rajagopalan, Rama Chellappa, Nathan Koterba

    IEEE Transactions on Image Processing · 2005

    32
  • From Local to Global: Edge Profiles to Camera Motion in Blurred Images

    Subeesh Vasu, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2017

    31
  • Shape-From-Focus by Tensor Voting

    R Hariharan, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2012

    31
  • Localize to Binauralize: Audio Spatialization from Visual Sound Source Localization

    Kranthi Kumar Rachavarapu, Aakanksha Aakanksha, Vignesh Sundaresha, Ambasamudram Narayanan Rajagopalan

    IEEE/CVF International Conference on Computer Vision (ICCV) · 2021

    30
  • Geometric inpainting of 3D structures

    Pratyush Sahay, Ambasamudram Narayanan Rajagopalan

    IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2015

    30
  • Learning Based Single Image Blur Detection and Segmentation

    Kuldeep Purohit, Anshul Shah, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2018

    29
  • Inferring Image Transformation and Structure from Motion-Blurred Images

    Paramanand Chandramouli, Ambasamudram Narayanan Rajagopalan

    British Machine Vision Conference (BMVC) · 2010

    A technique to estimate the scene depth with the knowledge of the estimated image transformations from observations that are blurred due to unconstrained camera motion is proposed.

    29
  • Deskewing of Underwater Images

    Karthik Seemakurthy, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2015

    28
  • Optimal recovery of depth from defocused images using an MRF model

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    International Conference on Computer Vision · 2002

    28
  • Illumination-Adaptive Unpaired Low-Light Enhancement

    Praveen Kandula, Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Circuits and Systems for Video Technology · 2023

    27
  • Non-Uniform Deblurring in HDR Image Reconstruction

    C. S. Vijay, Paramanand Chandramouli, Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    IEEE Transactions on Image Processing · 2013

    27
  • Dealing With Parallax in Shape-From-Focus

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2010

    27
  • A block shift-variant blur model for recovering depth from defocused images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    Proceedings - International Conference on Image Processing · 2002

    27
  • A BLOCK SHIFT-VARIANT BLUR MODEL FOR RECOVERING DEPTH

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    Proceedings., International Conference on Image Processing · 1995

    27
  • Degradation Aware Approach to Image Restoration Using Knowledge Distillation

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    IEEE Journal of Selected Topics in Signal Processing · 2020

    25
  • Image estimation in film-grain noise

    S. Ibrahim Sadhar, Ambasamudram Narayanan Rajagopalan

    IEEE Signal Processing Letters · 2005

    23
  • Image Registration and Change Detection under Rolling Shutter Motion Blur

    Vijay Rengarajan, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind, Guna S. Seetharaman

    IEEE Transactions on Pattern Analysis and Machine Intelligence · 2016

    22
  • Improving Robustness of Semantic Segmentation to Motion-Blur Using Class-Centric Augmentation

    Aakanksha Aakanksha, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2023

    21
  • Fast Motion-Deblurring of IR Images

    Nisha Varghese, Mahesh Mohan M. R., Ambasamudram Narayanan Rajagopalan

    IEEE Signal Processing Letters · 2022

    21
  • Mixed-dense connection networks for image and video super-resolution

    Kuldeep Purohit, Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    Neurocomputing · 2019

    A deep architecture for single image super-resolution (SISR) is proposed, built using efficient convolutional units the authors refer to as mixed-dense connection blocks (MDCB), which combines the strengths of both residual and dense connection strategies, while overcoming their limitations.

    20
  • Depth inpainting by tensor voting

    Mandar Kulkarni, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2013

    This paper proposes a fast and reliable algorithm for depth map inpainting using the tensor voting (TV) framework, and align the depth maps of the training set with the target (defective) depth map and evaluates the goodness of depth estimates among candidate values using 3D TV.

    19
  • Deep Dynamic Scene Deblurring for Unconstrained Dual-Lens Cameras

    Mahesh Mohan M. R., G. K. Nithin, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2021

    18
  • Multilevel weighted enhancement for underwater image dehazing

    Kuldeep Purohit, Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2019

    An approach for single-image dehazing by multilevel weighted enhancement of the image that reveals that their linear combination along with the coarsest information can successfully restore the image.

    18
  • Shape from Sharp and Motion-Blurred Image Pair

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    International Journal of Computer Vision · 2013

    This work develops a technique to estimate the transformation spread function (TSF) which symbolizes the camera shake and recovers the complete depth map of the scene within a regularization framework using an unblurred–blurred image pair.

    17
  • Towards Unrestrained Depth Inference with Coherent Occlusion Filling

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    International Journal of Computer Vision · 2011

    This work proposes a depth estimation framework using calibrated images captured under general camera motion and lens parameter variations that seeks to generalize the constrained areas of stereo and shape from defocus (SFD)/focus (SFF) by handling, in tandem, various effects such as focus variation, zoom, parallax and stereo occlusions, all under one roof.

    17
  • Resolution enhancement for binocular stereo

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2008

    17
  • Face recognition using multiple facial features

    Ambasamudram Narayanan Rajagopalan, K. Srinivasa Rao, Y. Anoop Kumar

    Pattern Recognition Letters · 2006

    A face recognition method that fuses information acquired from global and local features of the face for improving performance is proposed and validated on FERET and AR databases.

    17
  • A recursive algorithm for maximum likelihood-based identification of blur from multiple observations

    Ambasamudram Narayanan Rajagopalan, S. Chaudhuri

    IEEE Transactions on Image Processing · 1998

    A maximum likelihood-based method is proposed for blur identification from multiple observations of a scene when the relations among the blurring functions are known and the estimate of blur obtained is very good.

    17
  • NTIRE 2019 Challenge on Image Colorization: Report

    Shuhang Gu, Radu Timofte, Richard Zhang, Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan, Athi Narayanan S., Jameer Babu Pinjari, +16 more

    IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2019

    16
  • MRF model-based identification of shift-variant point spread function for a class of imaging systems

    Ambasamudram Narayanan Rajagopalan, S. Chaudhuri

    Signal Processing · 1999

    The proposed MAP-MRF based scheme for identifying a class of shift-variant imaging systems whose point spread function can be parameterized by a single blur parameter is proposed and the estimates of the SV blur are found to be better than that of the window-based blur identification technique.

    16
  • Performance Analysis of Maximum Likelihood Estimator for Recovery of Depth from Defocused Images and Optimal Selection of Camera Parameters

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    International Journal of Computer Vision · 1998

    A criterion for optimal selection of camera parameters to obtain an improved estimate of the depth is proposed and is based on the Cramer-Rao bound of the variance of the error in the estimate of blur.

    16
  • Boosting Positive Segments for Weakly-Supervised Audio-Visual Video Parsing

    Kranthi Kumar Rachavarapu, Ambasamudram Narayanan Rajagopalan

    IEEE/CVF International Conference on Computer Vision (ICCV) · 2023

    15
  • Going Unconstrained with Rolling Shutter Deblurring

    Mahesh Mohan M.R., Ambasamudram Narayanan Rajagopalan, Gunasekaran S. Seetharaman

    IEEE International Conference on Computer Vision (ICCV) · 2017

    15
  • Simultaneous depth recovery and image restoration from defocused images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2003

    15
  • Local Proximity for Enhanced Visibility in Haze

    Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2019

    14
  • Rolling Shutter Super-Resolution

    Abhijith Punnappurath, Vijay Rengarajan, Ambasamudram Narayanan Rajagopalan

    IEEE International Conference on Computer Vision (ICCV) · 2015

    14
  • Shape extraction of low‐textured objects in video microscopy

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    Journal of Microscopy · 2011

    This paper exploits spatial dependencies by modeling the shape of the object with a discontinuity‐adaptive Markov random field wherein the focus measure profile is used to judiciously control the degree of smoothness.

    13
  • Restoration of scanned photographic images

    S. Ibrahim Sadhar, Ambasamudram Narayanan Rajagopalan

    Signal Processing · 2005

    Based on the one-dimensional particle filter, a new approach is proposed for restoration under space-invariant as well as space-variant blurring conditions by propagating the samples of the probability distribution through an appropriate state model.

    13
  • Higher-order spectral analysis of human motion

    Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    Proceedings - International Conference on Image Processing · 2002

    13
  • Weakly-Supervised Audio-Visual Video Parsing with Prototype-Based Pseudo-Labeling

    Kranthi Kumar Rachavarapu, Kalyan Ramakrishnan, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2024

    12
  • Unconstrained Motion Deblurring for Dual-Lens Cameras

    Mahesh Mohan M.R., Sharath Girish, Ambasamudram Narayanan Rajagopalan

    IEEE/CVF International Conference on Computer Vision (ICCV) · 2019

    12
  • Joint image and depth completion in shape-from-focus: Taking a cue from parallax

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2010

    The interesting possibility of exploiting motion parallax cue in the images captured in Shape-from-focus with a practical camera to jointly inpaint the focused image and depth map is demonstrated.

    12
  • Scale-Recurrent Multi-residual Dense Network for Image Super-Resolution

    Kuldeep Purohit, Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2019

    A scale recurrent SR architecture built upon units containing series of dense connections within a residual block (Residual Dense Blocks) that allow extraction of abundant local features from the image while being parametrically more efficient as compared to current state-of-the-art approaches.

    11
  • Generating high quality pan-shots from motion blurred videos

    Nimisha Thekke Madam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    Computer Vision and Image Understanding · 2018

    A method to generate a pan photo from a video captured using a hand-held camera that first segments out the moving object by motion compensation of the background and then estimates the inter-frame velocity and relative depth of the object.

    11
  • A Model-Based Approach to Shape from Focus.

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    International Conference on Computer Vision Theory and Applications · 2008

    A lithographic silver halide photographic light-sensitive material is described which scarcely exhibits colored fringe and black pepper, forms halftone dots of good quality whether a fresh or an exhausted developer is used for processing thereof.

    11
  • Recursive framework for joint inpainting and de-noising of photographic films

    G. R. K. S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    Journal of the Optical Society of America A · 2010

    A recursive image recovery scheme based on the unscented Kalman filter (UKF) to simultaneously inpaint identified damaged portions in an image and suppress film-grain noise is presented.

    10
  • Importance Sampling Kalman Filter for Image Estimation

    G. R. K. S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    IEEE Signal Processing Letters · 2007

    10
  • Divide and Conquer for Full-Resolution Light Field Deblurring

    Mahesh Mohan M. R., Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2018

    9
  • Efficient Change Detection for Very Large Motion Blurred Images

    Vijay Rengarajan, Abhijith Punnappurath, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2014

    9
  • Inpainting Large Missing Regions in Range Images

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2010

    9
  • Discontinuity-Adaptive Shape from Focus Using a Non-convex Prior

    Krishnamurthy Ramnath, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2009

    A new SFF method that can provide rich structure information given limited number of observations and pose the shape estimation as a minimization problem within a Maximum A Posteriori - Markov Random Field framework.

    9
  • Background learning for robust face recognition

    Ramayan Singh, Ambasamudram Narayanan Rajagopalan

    Object recognition supported by user interaction for service robots · 2003

    9
  • Quantitative analysis of error bounds in the recovery of depth from defocused images

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri, Rama Chellappa

    Journal of the Optical Society of America A · 2000

    A new theorem is proposed that proves that the Cramér-Rao bound on the variance of the error in the estimate of blur decreases with an increase in the number of observations, and one can indeed get better estimates of depth from multiple defocused images compared with those using only a single image.

    9
  • Real-Time Large-Motion Deblurring for Gimbal-Based Imaging Systems

    Nisha Varghese, Ambasamudram Narayanan Rajagopalan, Zahir Ahmed Ansari

    IEEE Journal of Selected Topics in Signal Processing · 2024

    8
  • Hybrid Transformer Based Feature Fusion for Self-Supervised Monocular Depth Estimation

    Snehal Singh Tomar, Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2023

    8
  • Spatially-Adaptive Residual Networks for Efficient Image and Video Deblurring

    Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv.org · 2019

    Extensive qualitative and quantitative comparisons with prior art on benchmark dynamic scene deblurring datasets clearly demonstrate the superiority of the proposed networks via a reduction in model-size and significant improvements in accuracy and speed, enabling almost real-timedeblurring.

    8
  • Underwater Microscopic Shape from Focus

    S. Karthik, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2014

    8
  • Inferring Plane Orientation from a Single Motion Blurred Image

    M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2014

    8
  • Blind Super-resolution of Faces for Surveillance

    T. M. Nimisha, Ambasamudram Narayanan Rajagopalan

    Advances in computer vision and pattern recognition · 2021

    7
  • Deep end-to-end rolling shutter rectification

    Praveen Kandula, T. Lokesh Kumar, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2020

    The end-to-end formulation in this model does not constrain the estimated motion to ground truth motion parameters, thereby successfully rectifying the RS images with complex real-life camera motion.

    7
  • Robust Super-Resolution of Real Faces Using Smooth Features

    Saurabh Goswami, Aakanksha Aakanksha, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2020

    A two module super-resolution network where the feature extractor module extracts robust features from the LR image, and the SR module generates an HR estimate using only these robust features.

    7
  • DEPTH INPAINTING WITH TENSOR VOTING USING LOCAL GEOMETRY

    Mandar Kulkarni, Ambasamudram Narayanan Rajagopalan, Gerhard Rigoll

    International Conference on Computer Vision Theory and Applications · 2012

    This paper proposes a fast and simple algorithm for range map inpainting using Tensor Voting (TV) framework and uses 3D tensor voting for estimating different plane equations and pass depth estimates from all possible local planes that pass through a missing region.

    7
  • HDR Imaging under Non-uniform Blurring

    C. S. Vijay, Paramanand Chandramouli, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2012

    A technique to obtain the high dynamic range (HDR) irradiance of a scene from a set of differently exposed images captured using a hand-held camera and a transformation spread function (TSF) that represents space-variant blurring as a weighted average of differently transformed versions of the latent image.

    7
  • Natural Matting for Degraded Pictures

    Sahana M. Prabhu, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2011

    7
  • Inpainting in Multi-image Stereo

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2010

    This work proposes a new method for inpainting both image and depth of a scene using multiple stereo images and establishes the approaches in the belief propagation (BP) framework which also uses the segmentation cue for estimation/inpainting of depth maps.

    7
  • Depth estimation with a practical camera

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    British Machine Vision Conference (BMVC) · 2009

    This work proposes a framework for depth estimation from a set of calibrated images, captured under general camera motion and parameter variation, and uses the vital cue from color image segmentation to constrain the estimation process.

    7
  • Importance Sampling-Based Unscented Kalman Filter for Film-Grain Noise Removal

    G. R. K. S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    IEEE Multimedia · 2008

    7
  • Extension of the shape from focus method for reconstruction of high-resolution images

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2007

    This work proposes an extension to the traditional SFF method to optimally estimate a high-resolution image of the 3D object, given the low-resolution observations and the depth map derived from traditional S FF, and uses the observation stack to achieve significant improvement in resolution.

    7
  • A Discontinuity Adaptive Method for Super-Resolution of License Plates

    Kaggere V. Suresh, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2006

    A super-resolution algorithm tailored to enhance license plate numbers of moving vehicles in real traffic videos is proposed and a discontinuity adaptive regularizer is proposed to preserve edges in the reconstructed number plate for better readability.

    7
  • Improving Shape from Focus Using Defocus Information

    K. Pradeep, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2006

    7
  • Image recovery under nonlinear and non-Gaussian degradations

    S. Ibrahim Sadhar, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2005

    A new two-dimensional recursive filter for recovering degraded images is proposed that is based on particle-filter theory and validated by demonstrating its effectiveness in recovering images degraded by film-grain noise.

    7
  • Human Identification Using Gait

    Amit A. Kale, Ambasamudram Narayanan Rajagopalan, Naresh P. Cuntoor, Volker Krüger

    International Conference on Automatic Face and Gesture Recognition · 2002

    7
  • Higher-order-statistics-based detection of vehicles in still images

    Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    Journal of the Optical Society of America A · 2001

    When tested on real aerial images, the method gives good results, even for complicated scenes, while the false alarms are very few, and can serve as an important step toward building an automated traffic monitoring system.

    7
  • Locating Human Faces in a Cluttered Scene

    Ambasamudram Narayanan Rajagopalan, K. Sunil Kumar, Jayashree Karlekar, R. Manivasakan, M.M. Patil, U.B. Desai, P.G. Poonacha, Syomantak Chaudhuri

    Graphical Models · 2000

    Two new schemes for finding human faces in a photograph using a distribution-based model approach and a hidden Markov model (HMM) based approach to the face-finding problem are presented.

    7
  • DynaMoDe-NeRF: Motion-aware Deblurring Neural Radiance Field for Dynamic Scenes

    Ashish Kumar, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2025

    6
  • Motion blur for motion segmentation

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2013

    6
  • Real Aperture Axial Stereo: Solving for Correspondences in Blur

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2009

    This work proposes an algorithm which fuses the twin cues of defocus and parallax for recovering 3D structure and shows that in real-aperture axial stereo, both blur and pixel motion are tightly coupled to the underlying shape of the object.

    6
  • Harnessing defocus blur to recover high-resolution information in shape-from-focus technique

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    IET Computer Vision · 2008

    The authors propose to exploit the defocus information in the stack of LR images to obtain a super-resolved image as well as a high-resolution (HR) depth map of the underlying 3D object.

    6
  • Range Map with Missing Data - Joint Resolution Enhancement and Inpainting

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    2008 Sixth Indian Conference on Computer Vision, Graphics & Image Processing · 2008

    6
  • Robust space-variant super-resolution

    Kaggere V. Suresh, Ambasamudram Narayanan Rajagopalan

    IET International Conference on Visual Information Engineering (VIE) · 2006

    This paper uses a maximum a posteriori-Markov random field (MAP-MRF) based approach for recovering the high-resolution image and shows that modeling by MRF lends robustness to errors in estimation of motion and blur parameters.

    6
  • Image restoration using the particle filter: handling non-causality

    J.K. Prasanna, Ambasamudram Narayanan Rajagopalan

    IEE Proceedings - Vision Image and Signal Processing · 2006

    A recursive-state estimation scheme for image restoration using the particle filter with a novel choice for the state vector and a concurrent block estimation technique to incorporate full-plane regions of support for the image model as well as the blur.

    6
  • Depth Recovery from Defocused Images

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    In machine vision, most of the research on recovering scene structure is based on a pinhole camera model, but practical camera systems (and also the human eye) are not pinhole cameras but consist of real aperture lenses.

    6
  • Camera Shutter-Independent Registration and Rectification

    Subeesh Vasu, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    IEEE Transactions on Image Processing · 2017

    5
  • Color restoration in turbid medium

    Nimisha Thekke Madam, Karthik Seemakurthy, Ambasamudram Narayanan Rajagopalan, Narayanaswamy Vedachalam, Ramesh Raju

    Indian Conference on Computer Vision, Graphics and Image Processing · 2016

    This work proposes a color modulation scheme that is applied prior to color mapping to accommodate the same mapping function for different depths as well and results are given on several images to validate the efficacy of the proposed methodology.

    5
  • Unscented transformation for depth from motion-blur in videos

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    2009 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops · 2010

    5
  • Inpainting in Shape from Focus: Taking a Cue from Motion Parallax

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    British Machine Vision Conference (BMVC) · 2009

    This paper investigates the effect of motion parallax in SFF and demonstrates the interesting possibility of how it can be judiciously used to jointly inpaint image and depth profiles.

    5
  • Maximum likelihood estimation of blur from multiple observations

    Ambasamudram Narayanan Rajagopalan, Subhasis Chaudhuri

    IEEE International Conference on Acoustics Speech and Signal Processing · 2002

    5
  • Distortion Disentanglement and Knowledge Distillation for Satellite Image Restoration

    Praveen Kandula, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Geoscience and Remote Sensing · 2022

    4
  • Unpaired Image Denoising

    Priyatham Kattakinda, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2020

    First, a flow-based generative model is used to learn a prior from clean images, which is then used to train a denoising network without the need for any clean targets.

    4
  • Efficient Motion Deblurring with Feature Transformation and Spatial Attention

    Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2019

    4
  • Multi-Image Blind Super-Resolution of 3D Scenes

    Abhijith Punnappurath, Thekke Madam Nimisha, Ambasamudram Narayanan Rajagopalan

    IEEE Transactions on Image Processing · 2017

    4
  • Deskewing by space-variant deblurring

    Karthik Seemakurthy, Subeesh Vasu, Ambasamudram Narayanan Rajagopalan

    British Machine Vision Conference (BMVC) · 2016

    The notion of virtual depth map is introduced which is assigned to a planar scene when observed through a dynamic water surface and transform the deskewing problem into one of space-variant deblurring from a single image within an alternating minimization framework.

    4
  • Deep Decoupling of Defocus and Motion Blur for Dynamic Segmentation

    Abhijith Punnappurath, Yogesh Balaji, Mahesh Mohan, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2016

    A deep convolutional neural network is developed to predict the probabilistic distribution of the composite kernel which is the convolution of motion blur and defocus kernels at each pixel, which enables jointly handling defocus and motion blur to resolve depth-motion ambiguity.

    4
  • Multi-Shot Deblurring for 3D Scenes

    Madakannu Arun, Ambasamudram Narayanan Rajagopalan, Gunasekaran S. Seetharaman

    2015 IEEE International Conference on Computer Vision Workshop (ICCVW) · 2015

    4
  • Restoration of foggy and motion-blurred road scenes

    Thangamani Veeramani, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Proceedings - International Conference on Image Processing · 2013

    4
  • Image matching with higher-order geometric features

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2010

    A geometric matching technique in which line segments and elliptical arcs are used as edge features and the use of these higher-order features renders feature representation efficient.

    4
  • Unscented Kalman Filter for Image Estimation in Film-Grain Noise

    G. R. K. S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    Proceedings - International Conference on Image Processing · 2007

    4
  • High Resolution Image Reconstruction in Shape from Focus

    Rajiv R. Sahay, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2007

    4
  • Gait-Based Human Identification Using Appearance Matching

    Amit A. Kale, Naresh P. Cuntoor, B. Yegnanarayana, Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    Springer eBooks · 2006

    In this chapter, an appearance-based approach for recognizing human gait is presented and dynamic time-warping (DTW), which is a nonlinear time-normalization technique, is used to deal with naturally occurring changes in the walking speeds of individuals.

    4
  • A Probabilistic Fusion Methodology for Face Recognition

    K. Srinivasa Rao, Ambasamudram Narayanan Rajagopalan

    EURASIP Journal on Advances in Signal Processing · 2005

    4
  • Image clustering using higher-order statistics

    Ambasamudram Narayanan Rajagopalan

    Electronics Letters · 2002

    A more general higher-order statistics-based closeness measure derived from a series expansion for a multivariate probability density function in terms of the Gaussian function and the Hermite polynomials is proposed for clustering.

    4
  • Sea-Ing in Low-Light

    Nisha Varghese, Ambasamudram Narayanan Rajagopalan

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings - IEEE Computer Society Conference on Computer Vision and Pattern Recognition/Proceedings · 2025

    3
  • PNeRV: A Polynomial Neural Representation for Videos

    Sonam Gupta, Snehal Singh Tomar, Grigorios G. Chrysos, Sukhendu Das, Ambasamudram Narayanan Rajagopalan

    arXiv · 2024

    Polynomial Neural Representation for Videos (PNeRV), a parameter-wise efficient, patch-wise INR for videos that preserves spatiotemporal continuity, and a custom Hierarchical Patch-wise Spatial Sampling Scheme that ensures spatial continuity while retaining parameter efficiency.

    3
  • Motion Deblurring with an Adaptive Network

    Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv · 2019

    3
  • Semi-Supervised Learning of Camera Motion from A Blurred Image

    Nimisha Thekke Madam, Vijay Rengarajan, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2018

    3
  • Mosaicing deep underwater imagery

    Kuldeep Purohit, Subeesh Vasu, Ambasamudram Narayanan Rajagopalan, V. Bala Naga Jyothi, Ramesh Raju

    Indian Conference on Computer Vision, Graphics and Image Processing · 2016

    This work proposes a framework that restores deep UW images captured by Remotely Operated Vehicles in accordance with a suitably derived degradation model and harnesses the scene geometry information present in each image to aid in constructing a mosaic that is free from artifacts such as local blurring, ghosting, double contouring and visible seams.

    3
  • Tapping motion blur for robust normal estimation of planar scenes

    Subeesh Vasu, Ambasamudram Narayanan Rajagopalan, Gunasekaran S. Seetharaman

    Proceedings - International Conference on Image Processing · 2015

    3
  • Blind restoration of aerial imagery degraded by spatially varying motion blur

    Abhijith Punnappurath, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2014

    This paper develops a methodology for blind restoration of spatially varying blur induced by camera motion caused by instabilities of the moving platform and proposes a scheme to estimate the original focused image affected by arbitrarily-shaped blur kernels.

    3
  • Registration and occlusion detection in motion blur

    Abhijith Punnappurath, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Proceedings - International Conference on Image Processing · 2013

    3
  • Harnessing motion blur to uncover splicing

    M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2013

    3
  • Unified multiframe super-resolution of matte, foreground, and background

    Sahana M. Prabhu, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2013

    This paper proposes a multiframe approach to increase the spatial resolution of the matte, foreground, and background and shows that joint estimation is advantageous, as super-resolved edge information helps in obtaining a sharp matte, while the matte in turn aids in resolving fine details.

    3
  • Tensor Voting Based Foreground Object Extraction

    Mandar Kulkarni, Ambasamudram Narayanan Rajagopalan

    National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics (NCVPRIPG) · 2011

    3
  • Super-Resolution using Motion and Defocus Cues

    Kaggere V. Suresh, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2007

    3
  • A New Extension of Kalman Filter to Non-Gaussian Priors

    G. R. K. S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    Lecture notes in computer science · 2006

    This paper proposes a sampling-based Kalman Filter (KF) for the image estimation problem that compute the mean and covariance of the prior (possibly non-Gaussian) by importance sampling and shows that the estimates obtained are superior to the traditional Kalman filter that uses the auto-regressive state model.

    3
  • Motion-Free Superresolution.

    P. K. Vajapeyazula, Ambasamudram Narayanan Rajagopalan

    Indian Conference on Computer Vision, Graphics & Image Processing · 2002

    The theory of motion-free superresolution is examined by formulating the problem in the Discrete Time Fourier Transform (DTFT) and the DFT domain and provides some new insights into how aliasing and blurring can effect exact reconstruction of the superresolved image.

    3
  • Data clustering using hierarchical deterministic annealing and higher order statistics [image processing]

    Ambasamudram Narayanan Rajagopalan, A. Jain, U.B. Desai

    IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing · 1999

    Experimental results clearly demonstrate the improvement in the performance of the HDA algorithm when the interdependency among the clusters and the HOS of the data points are also utilized for the purpose of clustering.

    3
  • Single Noisy Image Super Resolution by Minimizing Nuclear Norm in Virtual Sparse Domain

    Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    Communications in computer and information science · 2018

    The approach minimizes nuclear norm in a virtual sparse domain to explore the inherent low-rank structure of visual data, and is further augmented with coarse-to-fine information by adaptively re-aligning the data along the principal components of a dictionary invirtual sparse domain.

    2
  • Recognizing blurred, nonfrontal, illumination, and expression variant partially occluded faces

    Abhijith Punnappurath, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2016

    The focus of this paper is on the problem of recognizing faces across space-varying motion blur, changes in pose, illumination, and expression, as well as partial occlusion, when only a single image per subject is available in the gallery.

    2
  • Hand-held low-light photography with exposure bracketing

    Madakannu Arun, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2016

    2
  • Splicing localization in motion blurred 3D scenes

    Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Image Processing · 2016

    2
  • HDR Recovery Under Rolling Shutter Distortions

    Sheetal B. Gupta, Ambasamudram Narayanan Rajagopalan, Gunasekaran S. Seetharaman

    2015 IEEE International Conference on Computer Vision Workshop (ICCVW) · 2015

    2
  • Illumination robust change detection with CMOS imaging sensors

    Vijay Rengarajan, Sheetal B. Gupta, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2015

    An optimization problem where each row of the distorted image is approximated as a weighted sum of the corresponding rows in warped versions of the reference image due to camera motion within the exposure period to account for geometric as well as photometric differences is formulated.

    2
  • Depth Estimation and Inpainting with an Unconstrained Camera

    Arnav V. Bhavsar, Ambasamudram Narayanan Rajagopalan

    British Machine Vision Conference (BMVC) · 2010

    This work proposes a depth estimation approach by elegantly coupling the motion and defocus cues, and uses the belief propagation method in the estimation approach, which also handles occlusions and using the color image segmentation cue.

    2
  • Efficient geometric matching with higher-order features

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2008

    2
  • Edge-preserving unscented Kalman filter for speckle reduction

    G.R.K.S. Subrahmanyam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind, Gerhard Rigoll

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2008

    2
  • An efficient representation of digital curves with line segments and elliptical arcs

    C. Paramanand, Ambasamudram Narayanan Rajagopalan

    IET International Conference on Visual Information Engineering (VIE) · 2006

    A new method to measure the curvature at a point on the curve, which is based on calculating the rate of change of tangential angle with respect to the curve length is proposed.

    2
  • Super-resolution in the presence of space-variant blur

    Kaggere V. Suresh, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2006

    2
  • Robust Face Recognition by Fusion.

    K. Srinivasa Rao Karri, Lilesh S. Ghadi, Y. Anoop Kumar, Ambasamudram Narayanan Rajagopalan

    Indian Conference on Computer Vision, Graphics and Image Processing · 2004

    A novel probabilistic framework that combines information acquired from different facial features for robust face recognition is proposed and the match with the highest score is used to establish the identity of the person.

    2
  • Data clustering using higher order statistics

    Ambasamudram Narayanan Rajagopalan, Mohammed Yeasin, S. Chauldhuri

    IEEE Region 10 Conference (TENCON) · 2002

    2
  • Identification of shift-variant point spread function for a class of imaging systems

    Ambasamudram Narayanan Rajagopalan, S. Chaudhuri

    IEEE Region 10 Conference (TENCON) · 2002

    2
  • Passive Methods for Depth Recovery

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    The apparatus available to support depth estimation in machine vision can extend beyond the cues of human vision, and in difficult circumstances, a combination of these cues may be required to obtain reliable depth information.

    2
  • S2DNet: A self-supervised deraining network using monocular videos

    Aman Kumar, Aditya Mohan, Ambasamudram Narayanan Rajagopalan

    Computer Vision and Image Understanding · 2025

    1
  • Ball Trajectory and Spin Analysis From Asynchronous Videos

    Aakanksha Aakanksha, Ashish Kumar, Ambasamudram Narayanan Rajagopalan

    IEEE Sensors Letters · 2025

    1
  • Semi-Supervised Implicit Augmentation for Data-Scarce VQA

    Bhargav Dodla, Kartik Hegde, Ambasamudram Narayanan Rajagopalan

    The 2nd AAAI Workshop on Artificial Intelligence with Biased or Scarce Data (AIBSD) · 2024

    SemIAug is introduced, a model and dataset agnostic strategy specially designed to address the challenges faced by limited data availability in the domain-specific VQA datasets and improves the VQA performance on data-scarce datasets without the need for additional data or labels.

    1
  • Unsupervised network for low-light enhancement

    Praveen Kandula, Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    arXiv · 2023

    An unsupervised low-light enhancement network using contextguided illumination-adaptive norm (CIN) and a region- Adaptive single input multiple output (SIMO) model that can generate multiple enhanced images from a single lowlight image.

    1
  • Latents2Semantics: Leveraging the Latent Space of Generative Models for Localized Style Manipulation of Face Images

    Snehal Singh Tomar, Ambasamudram Narayanan Rajagopalan

    arXiv · 2023

    The Latents2Semantics Autoencoder (L2SAE), a Generative Autoencoder model that facilitates highly localized editing of style attributes of several Regions of Interest (ROIs) in face images, is introduced, allowing for structure-preserving style editing of the chosen ROIs.

    1
  • Robust Unpaired Single Image Super-Resolution of Faces

    Saurabh Goswami, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    1
  • Latents2Segments: Disentangling the Latent Space of Generative Models for Semantic Segmentation of Face Images

    Snehal Singh Tomar, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    The endeavour in this work is to do away with the priors and complex pre-processing operations required by SOTA multi-class face segmentation models by reframing this operation as a downstream task post infusion of disentanglement with respect to facial semantic regions of interest (ROIs) in the latent space of a Generative Autoencoder model.

    1
  • Unfolding a blurred image

    Kuldeep Purohit, Anshul Shah, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    1
  • Multi-planar geometry and latent image recovery from a single motion-blurred image

    Kuldeep Purohit, Subeesh Vasu, M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan

    Machine Vision and Applications · 2021

    This work proposes a novel approach to estimate the normal of a planar surface from a single motion-blurred image of a multi-planar 3D scene and develops an algorithm for automatic recovery of the number of planes, the parameters corresponding to each plane, and camera motion from asingle motion- Blurred image.

    1
  • Unsupervised Domain-Specific Deblurring using Scale-Specific Attention

    Praveen Kandula, Ambasamudram Narayanan Rajagopalan

    arXiv · 2021

    1
  • Planar Geometry and Latest Scene Recovery from a Single Motion Blurred Image

    Kuldeep Purohit, Subeesh Vasu, M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan

    arXiv · 2019

    An approach for estimation of normal of a planar scene from a single motion blurred observation and a first-of-its-kind approach to recover the planar geometry and latent image of the scene by adopting an alternating minimization framework built on the findings.

    1
  • A Methodology to Reconstruct Large Damaged Regions in Heritage Structures

    Ambasamudram Narayanan Rajagopalan, Pratyush Sahay, Subeesh Vasu

    Springer eBooks · 2017

    This chapter discusses geometric reconstruction of large damaged regions (or holes) in 3D digital models and uses two methodologies to effectively harness the geometric prior: a non-iterative framework based on tensor voting when multiple self-similar examples are available and a dictionary learning-based method when only a singleSelf-similar example is available.

    1
  • Rolling shutter super-resolution in burst mode

    Vijay Rengarajan, Abhijith Punnappurath, Ambasamudram Narayanan Rajagopalan, Gunasekaran S. Seetharaman

    Proceedings - International Conference on Image Processing · 2016

    1
  • Framework for Processing Videos in the Presence of Spatially Varying Motion Blur

    Ambasamudram Narayanan Rajagopalan

    2016

    It must be emphasized that motion blur can also serve as a vital cue for camera motion estimation, depth recovery, super-resolution, and image forensics.

    1
  • Change detection in underwater imagery

    Karthik Seemakurthy, Ambasamudram Narayanan Rajagopalan

    Journal of the Optical Society of America A · 2016

    This work proposes a distort-difference pipeline that employs an alternating minimization framework to perform change detection in the presence of geometric distortions (skew) as well as photometric degradations (blur and global illumination variations).

    1
  • Seamless change detection and mosaicing for aerial imagery

    Nimisha Thekke Madam, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2015

    1
  • Camouflaging Motion Blur

    M. Purnachandra Rao, Sahana M. Prabhu, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Indian Conference on Computer Vision, Graphics and Image Processing · 2014

    This work applies a suitably derived blurring model to smear a target object and naturally blend it into the motion blurred background by using alpha matting to raise the interesting issue of camouaging motion blur with special relevance to non-uniformly blurred images.

    1
  • Lost But Found? Harnessing the Internet for Photometric Completion

    Pratyush Sahay, Ambasamudram Narayanan Rajagopalan

    IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) · 2013

    1
  • Matte Super-Resolution for Compositing

    Sahana M. Prabhu, Ambasamudram Narayanan Rajagopalan

    Lecture notes in computer science · 2010

    This paper treats super-resolution of the matte and foreground in a combined framework, incorporating the matting equation in the image degradation model, and uses a discontinuityadaptive smoothness prior to include observed data in the solution.

    1
  • Restoration of images degraded by sensor non-linearity

    S. Ibrahim Sadhar, Ambasamudram Narayanan Rajagopalan

    European Signal Processing Conference · 2004

    1
  • Robust Face Recognition in the Presence of Clutter

    Ambasamudram Narayanan Rajagopalan, Rama Chellappa, Nathan Koterba

    Lecture notes in computer science · 2003

    A new method within the framework of principal component analysis to robustly recognize faces in the presence of clutter is proposed and a suitable classifier is derived to distinguish non-face patterns from faces.

    1
  • MRF Model-Based Identification of Shift-Variant PSF

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    The problem addressed by Pentland Pen87 is a special case of the more general DFD problem in which the depth must be recovered given two defocused images of a scene, and effectively boils down to identifying a space-variant Gaussian defocusing process, given the input focused image and the degraded output image.

    1
  • ENet-GP: Unified Document Image Restoration

    Sujal Burad, Aakanksha, Ambasamudram Narayanan Rajagopalan, Sumit Shekar

    arXiv · 2026

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  • Guided Augmentation for Monocular Depth Estimation in Cell Microscopy

    Abhishek Viswanathan, Ambasamudram Narayanan Rajagopalan, Nikhil Yelamarthy, Ankit Rai, Pradeep Ramachandran

    Lecture notes in computer science · 2025

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  • Spatially-Attentive Patch-Hierarchical Network with Adaptive Sampling for Motion Deblurring

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv · 2024

    A pixel adaptive and feature attentive design for handling large blur variations across different spatial locations and process each test image adaptively and introduces a pixel-adaptive non-uniform sampling strategy that implicitly discovers the difficult-to-restore regions present in the image and performs fine-grained refinement in a progressive manner.

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  • Zero shot framework for satellite image restoration

    Praveen Kandula, Ambasamudram Narayanan Rajagopalan

    arXiv · 2023

    A mechanism to disentangle distortion is proposed and the use of knowledge distillation to train a restoration network using the generated image pairs and ablation studies show that the proposed mechanism successfully disentangles distortion.

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  • Unsupervised haze removal from underwater images

    Praveen Kandula, Ambasamudram Narayanan Rajagopalan

    arXiv · 2023

    This work proposes a new method to remove haze from underwater images using unpaired data using a Haze Disentanglement Network (HDN) and shows that the results of this method outperform prior art both visually and quantitatively.

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  • Exploring the Effectiveness of Mask-Guided Feature Modulation as a Mechanism for Localized Style Editing of Real Images (Student Abstract)

    Snehal Singh Tomar, Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    Proceedings of the AAAI Conference on Artificial Intelligence · 2023

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  • Exploring the Effectiveness of Mask-Guided Feature Modulation as a Mechanism for Localized Style Editing of Real Images

    Snehal Singh Tomar, Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    The SemanticStyle Autoencoder (SSAE), a deep Generative Autoen coder model that leverages semantic mask-guided latent space manipulation for highly localized photorealistic style editing of real images is presented.

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  • Image Superresolution using Scale-Recurrent Dense Network

    Kuldeep Purohit, Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

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  • Image Restoration using Feature-guidance

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    –
  • Adaptive Single Image Deblurring

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    –
  • Real-time multiple point target detection and tracking in infrared imagery✱

    Nisha Varghese, Ambasamudram Narayanan Rajagopalan

    Proceedings of the Thirteenth Indian Conference on Computer Vision, Graphics and Image Processing · 2022

    This work addresses the problem of real-time detection and tracking of multiple point targets in diverse background conditions by applying a ’top-hat’ operator as the first stage of the detection algorithm and followed by a systematic thresholding scheme to yield a good balance between MD and FA.

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  • Deep Networks for Image and Video Super-Resolution

    Kuldeep Purohit, Srimanta Mandal, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

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  • Adaptive Image Inpainting

    Maitreya Suin, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

    –
  • Dynamic Scene Video Deblurring using Non-Local Attention

    Maitreya Suin, Ambasamudram Narayanan Rajagopalan

    arXiv · 2022

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  • Deep network for rolling shutter rectification

    K Praveen, Lokesh Kumar T, Ambasamudram Narayanan Rajagopalan

    arXiv · 2021

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  • Mitigating Channel-wise Noise for Single Image Super Resolution

    Srimanta Mandal, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    arXiv · 2021

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  • IR Motion Deblurring

    Varghese, Nisha, Mahesh Mohan M. R., Ambasamudram Narayanan Rajagopalan

    arXiv · 2021

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  • Super-Resolution of Real-World Faces

    Saurabh Goswami, Aakanksha Aakanksha, Ambasamudram Narayanan Rajagopalan

    arXiv · 2020

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  • Planar Geometry and Image Recovery from Motion-Blur

    Kuldeep Purohit, Subeesh Vasu, M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan

    arXiv · 2019

    –
  • Color Image Super Resolution in Real Noise

    Srimanta Mandal, Kuldeep Purohit, Ambasamudram Narayanan Rajagopalan

    Indian Conference on Computer Vision, Graphics and Image Processing · 2018

    This paper proposes to super-resolve noisy color images by considering the color channels jointly through regularization term that involves projection onto PCA basis, which is constructed using similar patches extracted across different scales of the input image.

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  • Registration of Large Motion Blurred CMOS Images

    Ambasamudram Narayanan Rajagopalan

    2017

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  • Dictionary Replacement for Single Image Restoration of 3D Scenes.

    NimishaT M, Arun Mathamkode, Ambasamudram Narayanan Rajagopalan

    British Machine Vision Conference (BMVC) · 2016

    This paper addresses the problem of jointly estimating the latent image and the depth/blur map from a single space-variantly blurred image using dictionary learning using a multi-label MRF and solves it using graph-cut.

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  • 弓矢に向けて:都市シーンのローリングシャッタ整流【Powered by NICT】

    Vijay Rengarajan, Ambasamudram Narayanan Rajagopalan, R Aravind

    IEEE Conference Proceedings · 2016

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  • Cueing motion blur for registration of inclined planar scenes

    Arun Asokan Nair, M. Purnachandra Rao, Ambasamudram Narayanan Rajagopalan, Guna S. Seetharaman

    Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2015

    This work extends the state-of-the-art by cueing motion blur itself to infer plane inclination by matching extremities of blur kernels computed at different locations in the image by showing that it is possible to find the orientation.

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  • Layered Depth Inference from Flow in Underwater Imagery

    Karthik Seemakurthy, Ambasamudram Narayanan Rajagopalan

    Indian Conference on Computer Vision, Graphics and Image Processing · 2014

    Under reasonable assumptions, it is established that the motion blur induced by commonly observed uid flows can serve as a valuable cue for inferring the underlying depth layers of the scene.

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  • Preface

    Ambasamudram Narayanan Rajagopalan, Rama Chellappa

    Cambridge University Press eBooks · 2014

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  • Motion Estimation and Classification in Compressive Sensing from Dynamic Measurements

    Vijay Rengarajan, Ambasamudram Narayanan Rajagopalan, Rangarajan Aravind

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2014

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  • HDR imaging in the presence of motion blur

    C. S. Vijay, C. Paramanand, Ambasamudram Narayanan Rajagopalan

    Cambridge University Press eBooks · 2014

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  • Editorial introduction to the special issue

    Sharat Chandran, P. J. Narayanan, Ambasamudram Narayanan Rajagopalan

    The Visual Computer · 2011

    Extended versions of six papers that were first presented at the Seventh Indian Conference on Computer Vision, Graphics, and Image Processing (ICVGIP) are brought to you, in this special issue.

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  • Recursive Video Matting and Denoising

    Sahana M. Prabhu, Ambasamudram Narayanan Rajagopalan

    Proceedings - International Conference on Pattern Recognition/Proceedings/International Conference on Pattern Recognition · 2010

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  • Space-Variant Filtering Models for Recovering Depth

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    A new approach to time-variant filtering is suggested, based upon the generation of the time-frequency representation (TFR) of a signal, multiplication of that representation by a function H(w,t), which can be regarded as theTime-varying transfer function, and obtaining a filtered output by an inverse operation, assuming that the inverse exists.

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  • Conclusions

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

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  • ML Estimation of Depth and Optimal Camera Settings

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    In Section 2.2.3, it was pointed out that the recovery of depth from defocused images, in its generality, is equivalent to the problem of space-variant blur identification.

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  • Recursive Computation of Depth from Multiple Images

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    In this chapter, it was theoretically proved that the use of additional observations, if available, can lead to improved estimates of the depth of a scene.

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  • Mathematical Background

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

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  • Depth Recovery with a Block Shift-Variant Blur Model

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    This work has shown that splitting an image into independent subimages introduces an error in the estimate of blur due to improper selection of boundary, which can be reduced by choosing a larger size for the subimage.

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  • Simultaneous Depth Recovery and Image Restoration

    Subhasis Chaudhuri, Ambasamudram Narayanan Rajagopalan

    Springer eBooks · 1999

    This work proposes a multiple model-based extended Kalman filter for restoration of spatially varying blurred images and proposes the use of projections onto convex sets for space-varying image restoration.

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Publication data from OpenAlex, with missing venues and authors filled in from Crossref; citation counts are the higher of OpenAlex and Semantic Scholar, last synced 2026-10-15. One-sentence summaries under some papers are written by Semantic Scholar’s model. Citation counts may be lower than on Google Scholar, which indexes more sources.

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