Prof. Kannan Ramchandran Profile

Prof. Kannan Ramchandran

at Univ of California Berkeley

SPIE Involvement:

Author

Publications (30)

Proceedings Article | 22 September 2017 Open Access

Speeding up sparse signal recovery using sparse-graph codes (Conference Presentation)

Kannan Ramchandran

Proceedings Volume 10394, 1039402 (2017) https://doi.org/10.1117/12.2281055

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Proceedings Article | 24 September 2011 Paper

A distributed multichannel demand-adaptive P2P VoD system with optimized caching and neighbor-selection

Hao Zhang, Minghua Chen, Abhay Parekh, Kannan Ramchandran

Proceedings Volume 8135, 81350X (2011) https://doi.org/10.1117/12.896617

KEYWORDS: Video, Computer simulations, Clocks, Algorithms, Distributed computing, Internet, Switching, Switches, Detection and tracking algorithms, Lithium

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Proceedings Article | 2 September 2009 Paper

Remote video file synchronization for heterogeneous mobile clients

Hao Zhang, Chuohao Yeo, Kannan Ramchandran

Proceedings Volume 7443, 74430F (2009) https://doi.org/10.1117/12.829649

KEYWORDS: Video, Distortion, Video compression, Video coding, Binary data, Video processing, Image compression, Quantization, Semantic video, Visualization

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Proceedings Article | 28 January 2008 Paper

A rate-efficient approach for establishing visual correspondences via distributed source coding

Chuohao Yeo, Parvez Ahammad, Kannan Ramchandran

Proceedings Volume 6822, 68221R (2008) https://doi.org/10.1117/12.766552

KEYWORDS: Cameras, Visualization, Calibration, Image compression, Sensors, Error control coding, Principal component analysis, Data compression, Image processing, Computer programming

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Proceedings Article | 29 January 2007 Paper

Achieving H.264-like compression efficiency with distributed video coding

Simone Milani, Jiajun Wang, Kannan Ramchandran

Proceedings Volume 6508, 65082Z (2007) https://doi.org/10.1117/12.696471

KEYWORDS: Computer programming, Video coding, Video, Data modeling, Video compression, Quantization, Binary data, Motion estimation, Data compression, Motion models

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Proceedings Article | 29 January 2007 Paper

Robust distributed multi-view video compression for wireless camera networks

Chuohao Yeo, Kannan Ramchandran

Proceedings Volume 6508, 65080P (2007) https://doi.org/10.1117/12.705421

KEYWORDS: Cameras, Prisms, Video compression, Video, Computer programming, Video surveillance, Image compression, Telecommunications, Imaging systems, Sensors

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Proceedings Article | 13 November 2003 Paper

Estimation error bounds for frame denoising

Alyson Fletcher, Kannan Ramchandran

Proceedings Volume 5207, (2003) https://doi.org/10.1117/12.507260

KEYWORDS: Denoising, Error analysis, Signal to noise ratio, Distortion, Interference (communication), Associative arrays, Computer programming, Signal processing, Structural design, Wavelets

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Proceedings Article | 13 November 2003 Paper

Iterative projective wavelet methods for denoising

Alyson Fletcher, Vivek Goyal, Kannan Ramchandran

Proceedings Volume 5207, (2003) https://doi.org/10.1117/12.507250

KEYWORDS: Wavelets, Denoising, Wavelet transforms, Interference (communication), Signal to noise ratio, Digital filtering, Signal processing, Electrical engineering, Electronic filtering, Filtering (signal processing)

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Proceedings Article | 29 April 2002 Paper

Turbo-coded trellis-based constructions for data hiding

Jim Chou, Kannan Ramchandran, S. Sandeep Pradhan

Proceedings Volume 4675, (2002) https://doi.org/10.1117/12.465298

KEYWORDS: Forward error correction, Data hiding, Computer programming, Quantization, Signal to noise ratio, Digital watermarking, Distortion, Data compression, Composites, Bridges

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Proceedings Article | 4 December 2000 Paper

Graphical statistical modeling of wavelet coefficients and its applications

Igor Kozintsev, Shu Xiao, Kannan Ramchandran

Proceedings Volume 4119, (2000) https://doi.org/10.1117/12.408671

KEYWORDS: Wavelets, Denoising, Stochastic processes, Data modeling, Image processing, Statistical analysis, Silicon, Image compression, Performance modeling, Expectation maximization algorithms

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Proceedings Article | 17 August 2000 Paper

Information-theoretic bounds on target recognition performance

Avinash Jain, Pierre Moulin, Michael Miller, Kannan Ramchandran

Proceedings Volume 4050, (2000) https://doi.org/10.1117/12.395580

KEYWORDS: Sensors, Target recognition, Iron, Signal to noise ratio, Image sensors, Image compression, Target detection, Detection and tracking algorithms, Data modeling, Statistical analysis

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Proceedings Article | 19 April 2000 Paper

Wireless image transmission using multiple-description-based concatenated codes

Daniel Sachs, Anand Raghavan, Kannan Ramchandran

Proceedings Volume 3974, (2000) https://doi.org/10.1117/12.382963

KEYWORDS: Receivers, Error control coding, Image compression, Image transmission, Forward error correction, Image quality, Computer programming, Distortion, Internet, Signal to noise ratio

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Proceedings Article | 19 April 2000 Paper

Robust optimization solution to the data hiding problem using distributed source coding principles

Jim Chou, S. Sandeep Pradhan, Laurent El Ghaoui, Kannan Ramchandran

Proceedings Volume 3974, (2000) https://doi.org/10.1117/12.382959

KEYWORDS: Computer programming, Digital watermarking, Data compression, Distortion, Data hiding, Forward error correction, Distance measurement, Image compression, Interference (communication), Receivers

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Proceedings Article | 19 April 2000 Paper

Stochastic wavelet-based image modeling using factor graphs and its application to denoising

Shu Xiao, Igor Kozintsev, Kannan Ramchandran

Proceedings Volume 3974, (2000) https://doi.org/10.1117/12.382988

KEYWORDS: Wavelets, Expectation maximization algorithms, Image denoising, Denoising, Image compression, Image processing, Performance modeling, Statistical analysis, Stochastic processes, Image restoration

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Proceedings Article | 19 April 2000 Paper

Efficient image denoising using side information

S. Sandeep Pradhan, Kannan Ramchandran

Proceedings Volume 3974, (2000) https://doi.org/10.1117/12.383027

KEYWORDS: Computer programming, Wavelets, Data compression, Denoising, Image compression, Distortion, Data modeling, Digital imaging, Image transmission, Image denoising

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Proceedings Article | 27 December 1999 Paper

Optimal network proxy caching for image-rich contents

Xuguang Yang, Kannan Ramchandran

Proceedings Volume 3969, (1999) https://doi.org/10.1117/12.373526

KEYWORDS: Image transmission, Image resolution, Computing systems, Internet, Barium, Databases, Distributed computing, Computer networks, Optimization (mathematics), Computer programming

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Proceedings Article | 9 January 1998 Paper

Optimized linear-phase filter banks for wavelet image coding

Xuguang Yang, Kannan Ramchandran

Proceedings Volume 3309, (1998) https://doi.org/10.1117/12.298409

KEYWORDS: Linear filtering, Image filtering, Transform theory, Electronic filtering, Wavelets, Reconstruction algorithms, Optical filters, Image compression, Wavelet transforms, Optimization (mathematics)

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Proceedings Article | 30 October 1997 Paper

Comparative study of DCT and wavelet-based coding

Zixiang Xiong, Michael Orchard, Kannan Ramchandran

Proceedings Volume 3164, (1997) https://doi.org/10.1117/12.279559

KEYWORDS: Wavelet transforms, Image compression, Video coding, Wavelets

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Proceedings Article | 4 April 1997 Paper

Wavelet-based approach to inverse halftoning

Zixiang Xiong, Michael Orchard, Kannan Ramchandran

Proceedings Volume 3018, (1997) https://doi.org/10.1117/12.271578

KEYWORDS: Wavelets, Image compression, Halftones, Diffusion, Gaussian filters, Wavelet transforms, Image filtering, Filtering (signal processing), Edge detection, Image processing

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Proceedings Article | 10 January 1997 Paper

Efficient arithmetic coding for wavelet image compression

Zixiang Xiong, Kannan Ramchandran, Michael Orchard

Proceedings Volume 3024, (1997) https://doi.org/10.1117/12.263230

KEYWORDS: Binary data, Wavelets, Image compression, Data modeling, Promethium, Associative arrays, Performance modeling, Curium, Data compression, Transform theory

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Proceedings Article | 10 January 1997 Paper

Efficient arithmetic coding for wavelet image compression

Zixiang Xiong, Kannan Ramchandran, Michael Orchard

Proceedings Volume 3024, (1997) https://doi.org/10.1117/12.263294

KEYWORDS: Binary data, Wavelets, Image compression, Promethium, Data modeling, Associative arrays, Information operations, Data compression, Curium, Performance modeling

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Proceedings Article | 10 January 1997 Paper

Region-based video coding using backward motion-field segmentation

Xuguang Yang, Kannan Ramchandran

Proceedings Volume 3024, (1997) https://doi.org/10.1117/12.263287

KEYWORDS: Image segmentation, Video, Video coding, Motion estimation, Video compression, Quantization, Image compression, Motion models, Computer programming, Information operations

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Proceedings Article | 10 January 1997 Paper

Wavelet image coding using rate-distortion optimized backward adaptive classification

Scott LoPresto, Kannan Ramchandran, Michael Orchard

Proceedings Volume 3024, (1997) https://doi.org/10.1117/12.263182

KEYWORDS: Wavelets, Image compression, Data modeling, Quantization, Distortion, Image processing, Modeling, Computer programming, Image classification, Switching

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We introduce a new image compression framework that combines compression efficiency with speed, and is based on an independent infinite mixture model which accurately captures the space-frequency characterization of the wavelet image representation. Specifically, we model individual image wavelet coefficients as being drawn from an independent generalized Gaussian distribution (GGD) field of zero mean and unknown spatially-varying variances. Based on this model, we develop a powerful estimation-quantization (EQ) framework that consists of: (i) first finding the maximum- likelihood estimate of the individual spatially-varying coefficient field variances based on causal and quantized spatial neighborhood contexts; and (ii) then applying an off-line rate-distortion (R-D) optimized quantization/entropy coding strategy, implemented as a fast lookup table, that is optimally matched to the derived variance estimates. A distinctive feature of our framework is the dynamic partitioning of wavelet data into subsets representing coefficients that are 'predictable' and 'unpredictable' respectively from their quantized causal contexts. The statistical parameters of the 'unpredictable' set in each subband, obtained through a fast, R-D based, simple thresholding first-pass operation, represent the negligible parametric side-information for use in the forward adaptation mode. The combination of the powerful infinite mixture model, the dynamic switching between forward and backward adaptation modes, and the theoretical soundness and speed of the EQ framework lead to a novel, high-performing, and fast image coder that is extremely competitive with the best published coders in the literature across all classes of images and target bit rates of interest, in both compression efficiency and processing speed. For example, our coder exceeds the objective performance of the best zerotree-based wavelet coder at all bit rates for all tested images at a fraction of its complexity. At mow to medium bit rates our preliminary results appear to exceed all reported results in the wavelet image coding literature to the best of our knowledge.

Proceedings Article | 14 November 1996 Paper

Joint thresholding and quantizer selection for block-transform-based image coding with applications to baseline JPEG

Matthew Crouse, Kannan Ramchandran

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258244

KEYWORDS: Image compression, Computer programming, Quantization, Optimization (mathematics), Distortion, Wavelets, Image quality, Image storage, Spatial frequencies, Image quality standards

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Proceedings Article | 14 November 1996 Paper

Space-frequency methods in image compression

Zixiang Xiong, Kannan Ramchandran, Michael Orchard

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258242

KEYWORDS: Quantization, Wavelets, Image compression, Distortion, Algorithm development, Rubidium, Optimization (mathematics), Binary data, Wavelet transforms, Computer programming

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Proceedings Article | 14 November 1996 Paper

Space-frequency quantization for wavelet image coding

Zixiang Xiong, Kannan Ramchandran, Michael Orchard

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258247

KEYWORDS: Wavelets, Quantization, Image compression, Wavelet transforms, Joint transforms, Rubidium, Computer programming, Image filtering, Distortion, Optimization (mathematics)

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Proceedings Article | 27 February 1996 Paper

Motion-based representation of video sequences using variable block sizes

Johanna Gisladottir, Kannan Ramchandran, Michael Orchard

Proceedings Volume 2727, (1996) https://doi.org/10.1117/12.233251

KEYWORDS: Distortion, Motion models, Video, Image compression, Video coding, Motion estimation, Quantization, Computer programming, Video compression, Error analysis

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Proceedings Article | 17 April 1995 Paper

Forward-adaptive quantization with optimal overhead cost for image and video coding with applications to MPEG video coders

Antonio Ortega, Kannan Ramchandran

Proceedings Volume 2419, (1995) https://doi.org/10.1117/12.206352

KEYWORDS: Quantization, Image compression, Video, Computer programming, Video coding, Distortion, Optimization (mathematics), Video compression, Video processing, Image processing

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Proceedings Article | 6 April 1995 Paper

Wavelet-based image coding using a novel morphological framework

Michael Orchard, Kannan Ramchandran

Proceedings Volume 2491, (1995) https://doi.org/10.1117/12.205385

KEYWORDS: Wavelets, Quantization, Image compression, Wavelet transforms, Distortion, Computer simulations, Algorithm development, Computer programming, Signal to noise ratio, Linear filtering

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Proceedings Article | 6 April 1995 Paper

Efficient algorithm to find a jointly optimal time-frequency segmentation using time-varying filter banks

Cormac Herley, Zixiang Xiong, Kannan Ramchandran

Proceedings Volume 2491, (1995) https://doi.org/10.1117/12.205393

KEYWORDS: Time-frequency analysis, Electronic filtering, Image segmentation, Wavelets, Algorithm development, Evolutionary algorithms, Binary data, Image compression, Image filtering, Adaptive optics

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Showing 5 of 30 publications

Conference Committee Involvement (5)

Visual Communications and Image Processing 2007

30 January 2007 | San Jose, CA, United States

Visual Communications and Image Processing 2006

17 January 2006 | San Jose, California, United States

Image and Video Communications and Processing 2005

18 January 2005 | San Jose, California, United States

Visual Communications and Image Processing 2004

20 January 2004 | San Jose, California, United States

Image and Video Communications and Processing 2003

21 January 2003 | Santa Clara, CA, United States

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