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International Conference on Multimedia Signal Processing and Communication Technologies (IMPACT)

作者： Khan, Mohd Ayyub Moinuddin, Athar Ali Khan, Ekram Aligarh Muslim Univ Dept Elect Engn Aligarh Uttar Pradesh India

ISBN: (纸本)9781479912025

The wavelet-based video coders are excellent in providing the fine granular scalability (FGS), i.e. progressive bitstream, which can be used to multicast the video transmission to different users requiring different bit-rate, resolution and frame rate, from single coded bitstream. However, transmission of these bitstreams over erroneous channel is a challenging task. In this paper, application layer unequal error protection (UEP) using RS codes to embedded video bitstream transmitted over Additive White Gaussian Noise (AWGN) channel is investigated. The UEP of embedded bitstream exploits the non-uniform importance of the bits, in the reconstruction of the video. The bitstream is partitioned into two substreams namely, high priority (HP) and low priority (LP), depending upon their importance and sensitivity to channel errors. Then FEC based error protection is provided to them according to their priority. The results show that, under poor channel conditions, the UEP scheme improves the quality of the reconstructed video over EEP scheme for AWGN channel.

关键词： error protection bit stream AWGN channels video transmission video coder application layer videotapes Frame Rate

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On an Implementation of HEVC video Decoders with DSP Technology

On an Implementation of HEVC Video Decoders with DSP Technol...

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Pescador, F. Garrido, M. J. Juarez, E. Sanz, C. Univ Politecn Madrid Elect & Microelect Design Grp GDEM E-28040 Madrid Spain

ISBN: (纸本)9781467313636

High Efficiency video coder (HEVC) will become a new MPEG International Standard by the end of 2012. HEVC is targeted to provide the same quality as H.264 at about a half of the bit-rate and will replace soon to its predecessor in multimedia consumer applications. In this paper, a preliminary implementation of an HEVC video decoder based on a DSP is presented and compared with a formerly developed H.264 DSP-based decoder.

关键词： video Decoder Desmoplakin Gene Digital signal processing Bit rate video coder Moving Pictures Experts Group

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Adaptive rate controlling for reliable video communication over wireless packet networks

Adaptive rate controlling for reliable video communication o...

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International Conference on Image Processing

作者： Rajugopal, GR Hafez, RHM Carleton Univ Ottawa Canada

ISBN: (纸本)0818681837

This paper investigates the adaptive dynamic rate controlled video transmission for robust video communication under packet wireless environment. The video coder comprises of wavelet transform (WT), multi-resolution motion estimation (MRME) and robust zero tree coder The robust zero tree coder is a modification of the basic coder proposed by Shapiro to adopt coefficient level partitioning so as to slice out erroneous parts at the receiver and use the rest effectively. The adaptive dynamic rate controlling is required to adapt the video communication to the channel conditions so as to provide higher channel protection when the channel is severe and, improve the source rate and provide better performance when the conditions are favorable. The system evaluation is carried our under narrowband and broadband channel conditions. Both objective and subjective results are shown at 64 Kbps.

关键词： video communications Packet switched networks rate control source rate ENcoder waterway protection video coder rate adaptive system evaluation video transmission Narrowband wireless

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video CODING USING A SELF-ADAPTIVE REDUNDANT DICTIONARY CONSISTING OF SPATIAL AND TEMPORAL PREDICTION CANDIDATES

VIDEO CODING USING A SELF-ADAPTIVE REDUNDANT DICTIONARY CONS...

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IEEE International Conference on Multimedia and Expo Workshops (ICMEW)

作者： Xue, Yuanyi Wang, Yao NYU Polytech Sch Engn Dept Elect & Comp Engn New York NY 10003 USA

ISBN: (纸本)9781479947614

All standard video coders are based on the prediction plus transform representation of an image block, which predicts the current block using various intra-and inter-prediction modes and then represents the prediction error using a fixed orthonormal transform. We propose to directly represent a mean-removed block using a redundant dictionary consisting of all possible inter-prediction candidates with integer motion vectors (mean-removed). In general the dictionary may also contain some intra-prediction candidates and some pre-designed fixed dictionary atoms. However, simulation results reported in this papers are obtained by using the inter-prediction candidates only. We determine the coefficients by minimizing the L0 norm of the coefficients subject to a constraint on the sparse approximation error. We show that using such a self-adaptive dictionary can lead to a very sparse representation, with significantly fewer non-zero coefficients than using the DCT transform on the prediction error. We further propose a modified orthogonal matching pursuit (OMP) algorithm which othonormalizes each new chosen atom with respect to all previously chosen and orthonormalized atoms. Each image block is represented by the quantized coefficients corresponding to the othonormalized atoms, to overcome the inefficiency associated with using non-orthonormal atoms. Each image block is represented by its mean, which is predictively coded, the indices of the chosen atoms, and the quantized coefficients. Each variable is coded based on its unconditional distribution. Simulation results show that the proposed coder can achieve significant gain over the H.264 coder (implemented using x264) and achieve similar performance comparing to the HEVC reference encoder (HM).

关键词： Dictionaries Discrete cosine transforms Encoding Matching pursuit algorithms Quantization (signal) Vectors Dictionaries as Topic image patch Matching pursuit algorithms discrete cosine transforms Error of prediction video coding Atoms ENcoder self-adaptive video coder

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Multiple description video coding using motion-compensated algorithm 5

Multiple description video coding using motion-compensated a...

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5th IEEE Workshop on Multimedia Signal Processing (MMSP 2002)

作者： Franchi, N Fumagalli, M Lancini, R Politecn Milan CEFRIEL I-20133 Milan Italy

ISBN: (纸本)0780377133

This paper proposes a multiple description (MD) video coder, which uses motion-compensated predictions. We suggested a new algorithm of MD named Polyphase DownSampling that describes Intra and Inter frames. Results show that by using the coder scheme and the error environment like those suggested by 161 our MD algorithm improves the performance of the system both in coding efficiency and error-resilience. Moreover our MD coding approach allows the introduction of a multi level scalability. This last topic is the direction follows in the further research.

关键词： video coder multiple descriptions motion-compensated prediction H.263+

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JPEG2000-Compatible Scalable Scheme for Wavelet-Based video Coding

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EURASIP JOURNAL ON IMAGE AND video PROCESSING 2007年第unknown期2007卷 030852-030852页

作者： Andre, Thomas Cagnazzo, Marco Antonini, Marc Barlaud, Michel Univ Nice Sophia Antipolis CNRS UMR 6070 I3S Lab F-06903 Sophia Antipolis France

We present a simple yet efficient scalable scheme for wavelet-based video coders, able to provide on-demand spatial, temporal, and SNR scalability, and fully compatible with the still-image coding standard JPEG2000. Whereas hybrid video coders must undergo significant changes in order to support scalability, our coder only requires a specific wavelet filter for temporal analysis, as well as an adapted bit allocation procedure based on models of rate-distortion curves. Our study shows that scalably encoded sequences have the same or almost the same quality than nonscalably encoded ones, without a significant increase in complexity. A full compatibility with Motion JPEG2000, which tends to be a serious candidate for the compression of high-definition video sequences, is ensured. Copyright (C) 2007 Thomas Andre et al.

关键词： Pattern Recognition Computer Vision video Sequence video coder Temporal Analysis

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A SALIENCY-BASED RATE CONTROL FOR PEOPLE DETECTION IN video

A SALIENCY-BASED RATE CONTROL FOR PEOPLE DETECTION IN VIDEO

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Simone Milani Riccardo Bernardini Roberto Rinaldo DIEGM - University of Udine

ISBN: (纸本)9781479903573

Most of latest-generation multimedia systems are equipped with increasingly-effective object detection algorithms (e.g., intelligent video surveillance systems, augmented reality applications, sharing platforms for multimedia data, etc.). Unfortunately, images and video are usually available in compressed formats, which makes object detection more difficult because of the additional distortion noise. In this paper we show that it is possible to mitigate this problem by introducing a rate allocation algorithm that preserves important details for object identification algorithms. We propose a saliency map that identifies crucial elements for detectors. Then, we map saliency values to the value of the quantization parameter to be used by the video coder. Experimental results on HEVC coder show that the proposed rate control algorithm improves the accuracy with respect to the standard strategy.

关键词： Denoising Object detection Adaptive filtering Saliency map HOG Object detection adaptive filters videotapes Noise reduction video coder Allocation Algorithm MULTI-MEDIA SYSTEM

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Reduced-rank condensed filter dictionaries for inter-picture prediction

Reduced-rank condensed filter dictionaries for inter-picture...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： S. Li O. G. Guleryuz S. Yea U.C. Santa Barbara Santa Barbara CA USA

ISBN: (纸本)9781467369985

We consider the motion-compensated temporal prediction loop at the heart of modern video coders. Rather than using motion-compensated reference frame blocks directly as predictors, we incorporate their spatially-filtered versions into the prediction loop. We design adaptive filters that are geared toward successful prediction over sophisticated temporal evolutions involving lighting changes, focus changes, structured noise, and so on. The spatially and temporally varying nature of such video evolutions requires the learning and transmission of many filters, necessitating parameter reduction for compression and related applications. Unlike earlier work that tries to limit parameters by using a small set of general filters, or by restricting to symmetric filters, etc., we propose a novel parametrization of filters in terms of a set of base-filter kernels and modulation weights. Given a filter dictionary of K-tap filters, our work can be seen as providing a reduced-rank, prediction-optimal approximation of this dictionary that represents its filters with K' << K parameters.

关键词： HEVC VP9 inter-picture prediction low rank decompositions prediction filter Predictive filter Filters Dictionaries as Topic High efficiency video coding video coder structured noise adaptive filters REFERENCE FRAMES trees (mathematics)

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P2P SCALABLE video STREAMING USING DATA PRIORITY AND FEC-BASED NONCOOPERATIVEMULTIPLE DESCRIPTION

P2P SCALABLE VIDEO STREAMING USING DATA PRIORITY AND FEC-BAS...

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European Signal Processing Conference

作者： Marco Gaggio Simone Milani Livio Lima Pierangelo Migliorati Giancarlo Calvagno University of Padova Dept. of Information Engineering University of Brescia Dept. of Information Engineering

ISBN: (纸本)9781467310680

Recent years have assisted the proliferation of peer-to-peer (P2P) communications in streaming audio/visual contents over widely-distributed networks. This widespreading has also fostered the need for efficient video coding and transmission strategies. The paper present an MD coding and packet classification strategy that improves a traditional Multiple Description scheme basde on a scalable video coder and FEC codes via effective Unequal Error Protection and QoS classification. The proposed strategy uses a low-complexity packet prioritization strategy based on dependencies between video coding units to estimate the distortion associated to their loss. These data will be then used to tune the protection level of video packets and optimize the classification via Game Theory based approach. The paper compares the performance of the different configurations of the proposed approach with some state-of-the-art solutions (like srTCM) showing a quality improvement up to 6 dB.

关键词： P2P video Multiple description SVC Game theory Classification Cross-layer protection level video coder video coding videotapes Quality Improvement transmission strategies P2RY4 gene peer to peer file sharing error protection Game theory FEC Regimen Packet

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video CODING USING A SELF-ADAPTIVE REDUNDANT DICTIONARY CONSISTING OF SPATIAL AND TEMPORAL PREDICTION CANDIDATES

VIDEO CODING USING A SELF-ADAPTIVE REDUNDANT DICTIONARY CONS...

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IEEE International Conference on Multimedia and Expo

作者： Yuanyi Xue Yao Wang Department of Electrical and Computer Engineering Polytechnic School of Engineering New York University

ISBN: (纸本)9781479947607

All standard video coders are based on the prediction plus transform representation of an image block, which predicts the current block using various intra- and inter-prediction modes and then represents the prediction error using a fixed orthonormal transform. We propose to directly represent a mean-removed block using a redundant dictionary consisting of all possible inter-prediction candidates with integer motion vectors (mean-removed). In general the dictionary may also contain some intra-prediction candidates and some pre-designed fixed dictionary atoms. However, simulation results reported in this papers are obtained by using the inter-prediction candidates only. We determine the coefficients by minimizing the L0 norm of the coefficients subject to a constraint on the sparse approximation error. We show that using such a self-adaptive dictionary can lead to a very sparse representation, with significantly fewer non-zero coefficients than using the DCT transform on the prediction error. We further propose a modified orthogonal matching pursuit (OMP) algorithm which othonormalizes each new chosen atom with respect to all previously chosen and orthonormalized atoms. Each image block is represented by the quantized coefficients corresponding to the othonormalized atoms, to overcome the inefficiency associated with using non-orthonormal atoms. Each image block is represented by its mean, which is predictively coded, the indices of the chosen atoms, and the quantized coefficients. Each variable is coded based on its unconditional distribution. Simulation results show that the proposed coder can achieve significant gain over the H.264 coder (implemented using ×264) and achieve similar performance comparing to the HEVC reference encoder (HM).

关键词： image patch Error of prediction Dictionaries as Topic Atoms ENcoder video coder Political Candidates videotapes Approximation error sparse representation Coefficients Simulation results

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