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MPEG-4-based error resilient coding with closed-loop interaction among peripheral and centralised processing modules

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ELECTRONICS LETTERS 2006年第24期42卷 1387-1389页

作者： Sacchil, C. Conci, N. Prisciandaro, L. De Natale, F. Univ Trent Dept Informat & Telecommun Technol DIT I-38050 Trento Italy Create Net Int Res Ctr I-38100 Trento Italy

Proposed is a novel MPEG-4-based video coding the resilience of which is implemented by exploiting region-of-interest scalability together with a closed-loop interaction between a central processing system, devoted to object detection and tracking, and the video coding embedded at sensor level. Results in terms of processing reliability, achieved in a formal way, prove the usefulness of the proposed approach in the context of scene monitoring applications.

关键词： image and video coding object tracking MPEG-4-based video coding centralised processing modules MPEG-4-based error resilient coding video signal processing scene monitoring peripheral processing modules video coding central processing system object detection

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Error-resilient SPIHT image coding

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ELECTRONICS LETTERS 2000年第3期36卷 208-210页

作者： Yang, SH Cheng, TC Natl Taipei Unniv Technol Inst Comp Commun & Control Taipei Taiwan

The authors develop an efficient error-resilient scheme for the set partitioning in hierarchical trees (SPIHT) technique, one of the most successful image compression algorithms. By partitioning the coded data sequence and adding appropriate side information, the proposed algorithm provides significantly better PSNR performance over noisy channels with a minimal increase in the coding complexity.

关键词： set partitioning in hierarchical trees image and video coding data compression coding complexity image coding error-resilient SPIHT image coding Codes appropriate side information Physics and chemistry computing physics computing error-resilient scheme coded data sequence partitioning noisy channels PSNR performance optical noise Computer vision and image processing techniques image processing and restoration image recognition

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Spatial coefficient partitioning for lossless wavelet image coding

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IEE PROCEEDINGS-VISION image AND SIGNAL PROCESSING 2002年第6期149卷 365-369页

作者： Cheung, KW Po, LM City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

In pyramidal wavelet representation, an image is decomposed into multiresolution and multifrequency subbands with sets of tree-structured coefficients, Le. a spatial orientation tree which consists of coefficients at different resolutions and different orientations but associated with the same spatial location. The magnitudes of the coefficients in these trees measure the signal activity level of the corresponding spatial areas. A novel coefficient partitioning algorithm is introduced for splitting the coefficients into two sets using a spatial orientation tree data structure. By splitting the coefficients, the overall theoretical entropy is reduced due to the different probability distributions for the two coefficient sets. In the spatial domain, it is equivalent to identifying smooth regions of the image. A lossless coder based on this spatial coefficient partitioning has a better coding performance than other wavelet-based lossless image coders such as S + P and JPEG-2000.

关键词： lossless coder spatial orientation tree data structure spatial coefficient partitioning File organisation transform coding multiresolution subbands multifrequency subbands tree-structured coefficients lossless wavelet image coding Computer vision and image processing techniques smooth regions image coding pyramidal wavelet representation tree data structures spatial domain probability distributions image and video coding entropy signal activity level wavelet transforms coefficient sets spatial location

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Data hiding tools for multiple description video coding

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ELECTRONICS LETTERS 2009年第2期45卷 98-99页

作者： Conci, N. Carli, M. Boato, G. Queen Mary Univ London Dept Elect Engn London E1 4NS England Univ Roma Tre Dept Appl Elect I-00146 Rome Italy Univ Trent Dept Informat Engn & Comp Sci I-38100 Trento Italy

One of the major constraints in multiple description coding is the introduction of a variable amount of overhead, which is necessary to achieve a good perceived quality in case one or more descriptors are lost during transmission. In this reported work, data hiding techniques are exploited to optimise the trade-off between redundancy and quality in a two-descriptors scenario.

关键词： image and video coding data hiding tool data encapsulation video signal processing multiple description video coding video coding

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Progressive image coding using set partitioning in hierarchical tree algorithm and embedded trellis-coded quantiser

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ELECTRONICS LETTERS 2001年第9期37卷 561-563页

作者： Hu, MY Tang, TB Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

A progressive image-coding algorithm that uses a combination of the set partitioning in hierarchical tree (SPIHT) algorithm and an embedded trellis-coded quantiser (E-TCQ) is proposed. Using the hierarchical quadtree structure, a significant map of coefficients is encoded. The E-TCQ is then used to refine the amplitude of the method. It is shown that this method gives good performance, with very little increase in computational complexity and storage memory.

关键词： significant map of coefficients encoding hierarchical quadtree structure image and video coding quadtrees image coding quantisation (signal) embedded trellis-coded quantiser trellis codes SPIHT algorithm progressive image-coding algorithm set partitioning in hierarchical tree algorithm Computer vision and image processing techniques computational complexity

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Picture complexity based rate allocation algorithm for transcoded video over ABR networks

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ELECTRONICS LETTERS 2000年第6期36卷 521-522页

作者： Rosdiana, E Ghanbari, M Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England

A novel method for distributing the available bandwidth among the contending ABR video sources is introduced. By allocating channel bandwidth to the sources based on the video complexity, it is possible to optimise th... 详细信息

关键词： ATM service ATM network broadband networks telecommunication congestion control Communication switching digital communication visual communication available bandwidth distribution video complexity Telecommunication applications picture complexity based rate allocation algorithm available bit rate services bandwidth allocation transcoded video ABR networks channel bandwidth allocation picture quality image and video coding asynchronous transfer mode network utilisation optimisation ABR video sources video coding

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Motion estimation algorithm with low complexity for video compression

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ELECTRONICS LETTERS 2000年第18期36卷 1533-1535页

作者： Kang, HS Hyundai Elect Co Ltd Adv Tech Lab Mobile Telecom Terminal R&D CtrSeocho Ku Seoul 137070 South Korea

The author presents a new motion estimation method which reduces the computational complexity in video compression. This is achieved by skipping the motion estimation operation for macro-blocks, where it is determined... 详细信息

关键词： motion estimation image and video coding data compression computational complexity reduction Computational complexity low complexity algorithm video signal processing video compression video coding computational complexity motion estimation algorithm

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Perceptual adaptive quantisation scheme for H.263 video coder

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ELECTRONICS LETTERS 2000年第17期36卷 1454-1456页

作者： Jia, ZK Cui, HJ Tang, K Tsing Hua Univ Dept Elect Engn State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China

The authors propose an efficient perceptual adaptive quantisation scheme that uses Q-N (quantisation step - number of output bits) mapping tables and fuzzy perceptual classifiers. Using this adaptive quantisation sche... 详细信息

关键词： fuzzy systems adaptive quantisation scheme stable perceptual quality image and video coding perceptual adaptive quantisation scheme H.263 video coder quantisation step-number quantisation (signal) Codes fuzzy perceptual classifiers output bits constant output bit rate video signal processing visual effects image classification video coding Computer vision and image processing techniques mapping tables

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Measuring blocking artefacts using harmonic analysis

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ELECTRONICS LETTERS 1999年第16期35卷 1322-1323页

作者： Tan, KT Ghanbari, M Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England

A novel method for estimating blockiness in MPEG-coded pictures is introduced. By measuring the harmonics generated by blocking artefacts in the frequency domain, an accurate and offset-insensitive estimation of block... 详细信息

关键词： image and video coding data compression frequency domain blocking artefact MPEG coding blockiness harmonic analysis video coding frequency-domain analysis picture processing

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Open-loop rate control for JPEC-LS near lossless image compression

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ELECTRONICS LETTERS 1999年第6期35卷 465-466页

作者： Jiang, J Reddy, M Univ Glamorgan Sch Comp Pontypridd CF37 1DL M Glam Wales

A low cost rate control scheme is presented to achieve an open-loop rare control for JPEG-LS near lossless coding mode, the forthcoming new standard for lossless image compression. The scheme is implemented by further exploitation of the local texture analysis, designed in JPEG-LS, to indicate the compressibility indirectly. Hence, the information loss level may be controlled automatically and can be adaptive to the local texture. Consequently, a similar compression ratio is maintained for different images.

关键词： telecommunication standards image and video coding standard data compression local texture analysis image coding open-loop rate control compressibility Codes JPEC-LS near lossless image compression compression ratio Signal processing theory image texture Computer vision and image processing techniques information loss level

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