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Neighbourhood structure estimation of images using hierarchical testing

ELECTRONICS LETTERS 1999年第25期35卷 2188-2189页

作者： Zimeras, S Aykroyd, RG INRIA IRISA F-35042 Rennes France Univ Leeds Dept Stat Leeds LS2 9JT W Yorkshire England

Methods for estimating model parameters using likelihood techniques are examined and a model selection procedure is proposed for classifying the neighbourhood structure of the image. The techniques are investigated us... 详细信息

关键词： image and video coding simulated data model parameters Probability theory, stochastic processes, and statistics image coding Computational complexity image neighbourhood structure neighbourhood structure estimation likelihood techniques computational complexity Probability and statistics hierarchical testing image processing and restoration model selection procedure Computer vision and image processing techniques statistical analysis

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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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Simple binary wavelet filters for efficient VLSI implementation

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ELECTRONICS LETTERS 1999年第7期35卷 555-557页

作者： Rassau, AM Chae, SI Eshraghian, K Univ Reading Dept Cybernet Reading RG6 6AY Berks England Seoul Natl Univ Sch Elect Engn Seoul 151742 South Korea

The performance of simple binary wavelet filters is investigated for VLSI implementations. Several low-complexity fillers were found to be useful for VLSI implementations of very low bit rate wavelet coders when hardw... 详细信息

关键词： Integral transforms in numerical analysis compression performance digital filters VLSI implementation very low bit rate wavelet coders Signal processing theory discrete wavelet transform filtering theory low-complexity filters data compression Digital filters image coding FIR filters hardware complexity minimisation Computer vision and image processing techniques wavelet transforms binary wavelet filters image and video coding Integral transforms VLSI Filtering methods in signal processing circuit complexity Computational complexity DWT computational complexity

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Method for estimating lossless image compression bound

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ELECTRONICS LETTERS 1999年第22期35卷 1931-1932页

作者： Zhang, N Zhang, YJ Lin, QD Lin, XG Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

A practical method for estimating the lossless image compression bound based on high-order conditional entropy analysis is proposed. This analysis can be performed within an ordinary image as opposed to dealing with an enormous training set. Its feasibility and reliability have been verified on a large group of images naturally acquired by various imaging sensors.

关键词： image and video coding data compression high-order conditional entropy analysis image coding lossless image compression bound estimation entropy

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Selective macroblock level switching for model-based coded video

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ELECTRONICS LETTERS 1999年第5期35卷 388-389页

作者： Woods, JC Ramanan, S Pearson, DE Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England

Previous switched model-based coders have employed switching techniques at a high level, switching the entire frame between an H.261 coded image and a model-based image according to a bit-rate/quality metric. The performance of a new scheme, in which the switching takes place in selected regions, is reported. Subjective quality and PSNR are improved, particularly for large rotational or translational motion.

关键词： selective macroblock level switching image and video coding subjective quality improvement translational motion switching PSNR improvement model-based coded video rotational motion video signal processing selected regions motion compensation video coding

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Accurate analytical model for MPEG coded video traffic

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ELECTRONICS LETTERS 1999年第17期35卷 1449-1450页

作者： Liu, H Ansari, N Shi, YQ New Jersey Inst Technol Dept Elect & Comp Engn NJ Ctr Wireless Telecommun Newark NJ 07102 USA

Self-similar processes, modulated according to the MPEG GOP (group of pictures) structure, are proposed to accurately capture both the SRD (short range dependency) and LRD (long range dependency) of MPEG video traffic.

关键词： code standards analytical model modulation least squares approximations image and video coding data compression group of pictures structure telecommunication traffic MPEG coded video traffic long range dependency visual communication self-similar processes LS method Interpolation and function approximation (numerical analysis) short range dependency video coding modelling MPEG GOP structure

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Efficient MPEG-4/H/263 video transcoder for interoperability of heterogeneous multimedia networks

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ELECTRONICS LETTERS 1999年第11期35卷 863-864页

作者： Dogan, S Sadka, AH Kondoz, AM Univ Surrey Ctr Commun Syst Res Guildford GU2 5HX Surrey England

As well as some similarities, there are a number of differences between MPEG-4 and the H.263 bitstream syntax. The inclusion of a video transcoder is proposed to achieve interoperability between the two video standards. This novel transcoding algorithm is proved to give highly improved service quality while reducing the complexity and the time delay of conventional cascaded decoding/re-encoding processes.

关键词： code standards telecommunication standards open systems Multimedia communications image and video coding data compression multimedia communication service quality improvement MPEG-4/H.263 video transcoder H.263 bitstream syntax transcoding algorithm heterogeneous multimedia networks video standards video coding interoperability telecommunication networks MPEG-4 bitstream syntax code convertors

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Data re-ordering technique for lossless LZW continuous-tone image compression

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ELECTRONICS LETTERS 1999年第20期35卷 1716-1717页

作者： Ng, KS Cheng, LM City Univ Hong Kong Dept Elect Engn Hong Kong SAR Peoples R China

A data re-ordering technique is proposed to enhance the compression performance of lossless LZW image compression over continuous-tone images. The proposed scheme incurs few overheads and functions as a preprocessing stage prior to actual compression. The compression performance is increased by an average of 18% for continuous-tone test images compared with the popular GIF compressor.

关键词： lossless LZW continuous-tone image compression image and video coding data compression image coding data re-ordering technique Computer vision and image processing techniques Lempel-Ziv-Welch compression preprocessing stage

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Comparison of perceptually uniform quantisation with average error minimisation in image transform coding

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ELECTRONICS LETTERS 1999年第13期35卷 1067-1068页

作者： Malo, J Ferri, FJ Albert, J Soret, J Univ Valencia E-46100 Valencia Spain

An alternative transform coder design criterion based on restricting the maximum perceptual error of each coefficient is proposed. This perceptually uniform quantisation of the transform domain ensures that the perceptual error will be below a certain limit regardless of the particular input image. The results show that the proposed criterion improves the subjective quality of the conventional average error criterion even if it is weighted with the same perceptual metric.

关键词： maximum perceptual error restriction transform coding image and video coding minimisation image transform coding image coding quantisation (signal) perceptually uniform quantisation transform coder design criterion Signal processing theory average error minimisation coding errors Computer vision and image processing techniques

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Scalable wavelet coding for synthetic/natural hybrid images

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR video TECHNOLOGY 1999年第2期9卷 244-254页

作者： Sodagar, I Lee, HJ Hatrack, P Zhang, YQ Sarnoff Corp Multimedia Technol Lab Princeton NJ 08512 USA

This paper describes the texture representation scheme adopted for MPEG-4 synthetic/natural hybrid coding (SNHC) of texture maps and images. The scheme is based on the concept of muitiscale zerotree wavelet entropy (MZTE) coding technique, which provides many levels of scalability layers in terms of either spatial resolutions or picture quality. MZTE, with three different modes (single-Q, multi-Q, and bilevel), provides much improved compression efficiency and fine-gradual scalabilities, which are ideal for hybrid coding of texture maps and natural images. The MZTE scheme is adopted as the baseline technique for the visual texture coding profile in both the MPEG-4 video group and SNHC group. The test results are presented in comparison with those coded by the baseline JPEG scheme for different types of input images, MZTE was also rated as one of the top five schemes in terms of compression efficiency in the JPEG2000 November 1997 evaluation, among 27 submitted proposals.

关键词： compression image and video coding JPEG-20001 MPEG-4 texture coding wavelet

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