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Perceptual adaptive quantisation scheme for H.263 video coder

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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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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coding of arbitrarily shaped video objects based on SPIHT

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ELECTRONICS LETTERS 2000年第13期36卷 1105-1106页

作者： Yuan, YF Chan, CW Nanyang Technol Univ Sch Elect & Elect Engn Informat Engn Div Singapore 639798 Singapore

A new coding algorithm is proposed for encoding arbitrarily shaped video objects. This algorithm employs an object-based discrete wavelet transform to decompose the video object. The decomposed pyramid is entropy encoded with a modified set partitioning in hierarchical trees (SPIHT) algorithm called partial-SPIHT (P-SPIHT). which only encodes the coefficients belonging to the decomposed video objects. The performance of this algorithm shows that it is a competitive candidate for the standardisation of video object coding.

关键词： coding algorithm discrete wavelet transforms trees (mathematics) object-based discrete wavelet transform Integral transforms in numerical analysis image and video coding P-SPIHT arbitrarily shaped video objects video signal processing partial-SPIHT hierarchical trees modified set partitioning Combinatorial mathematics video coding decomposed pyramid standardisation

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image watermarking using Hadamard transforms

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ELECTRONICS LETTERS 2000年第3期36卷 211-213页

作者： Falkowski, BJ Lim, LS Nanyang Technol Univ Singapore 639798 Singapore

A novel method based on the multi-resolution transform and complex Hadamard transform to embed watermarks in grey scale digital images is proposed. The results show that the presented scheme is robust to JPEG compress... 详细信息

关键词： dithering distortion data compression Codes optical noise multi-resolution transform JPEG compression robust schemes image watermarking image coding robust control Hadamard transforms grey scale digital images complex Hadamard transform Computer vision and image processing techniques image processing and restoration Resolution of optical images image and video coding watermarking effects image resolution image resizing cropping robust

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Factorisation for subclass of symmetric-antisymmetric multifilter banks and its application to image coding

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ELECTRONICS LETTERS 2000年第6期36卷 516-518页

作者： Gao, XQ Gan, L Zou, CR Southeast Univ Dept Radio Engn Nanjing 210096 Peoples R China

A complete and minimal factorisation is proposed for an important subclass of symmetric-antisymmetric multiwavelet filter banks (SAMFBs). Based on this factorisation, optimal SAMFBs are designed for image coding under an optimisation criterion. Experimental results show that the SAMFBs significantly outperform the traditional 9-7 wavelet in terms of coding efficiency, especially for hard-to-compress images.

关键词： optimisation symmetric-antisymmetric multifilter banks coding efficiency filtering theory image and video coding data compression hard-to-compress images Filtering methods in signal processing Optimisation techniques optimisation criterion image coding minimal factorisation zerotree image coder multiwavelet filter banks Signal processing theory image coding application Computer vision and image processing techniques

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Fractal image compression with simple classification scheme in frequency domain

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ELECTRONICS LETTERS 2000年第8期36卷 716-717页

作者： Jeng, JH Shyu, JR I Shou Univ Dept Informat Engn Kaohsiung 84008 Taiwan

In fractal image compression, the mean squared error (MSE) computations of the eight orientations of the domain blocks can be reduced into two groups of inner products in the frequency domain. A very simple classification scheme is presented for reducing the two groups of computations into one, which makes the encoder up to 4.7 times faster.

关键词： image and video coding data compression fractals encoder image coding frequency domain classification inner product fractal image compression mean squared error computation image classification mean square error methods

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Wavelet based image adaptive watermarking scheme

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ELECTRONICS LETTERS 2000年第4期36卷 312-313页

作者： Kaewkamnerd, N Rao, KR Univ Texas Dept Elect Engn Arlington TX 76019 USA

An image adaptive watermark casting method based on the wavelet transform is proposed. To increase the robustness and perceptual invisibility, the algorithm is combined with the quantisation model based on the human visual system. The number of factors that affect the noise sensitivity of the human eye are taken into consideration. Experimental results demonstrate the robustness of the algorithm to high compression environments.

关键词： wavelet transforms image and video coding Integral transforms in numerical analysis data compression perceptual invisibility image coding quantisation model quantisation (signal) compression environments robustness noise sensitivity adaptive watermarking scheme human visual system Computer vision and image processing techniques wavelet transform

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Moving video object segmentation using statistical hypothesis testing

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ELECTRONICS LETTERS 2000年第2期36卷 128-129页

作者： Kim, M Kim, J Elect & Telecommun Res Inst Yusong Gu Taejon 305350 South Korea

Object-based coding is one of the distinct features of the MPEG-4 standard. Hence, video object segmentation is an indispensable process for MPEG-4 coding. A method of localising moving objects for video object segmentation is introduced which utilises a statistical hypothesis test without the need for true statistical parameters to be known a priori.

关键词： statistical hypothesis testing MPEG-4 coding image and video coding image segmentation normal distribution MPEG-4 standard video signal processing moving video object segmentation video coding Other topics in statistics statistical analysis

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Rate-optimised motion estimation

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ELECTRONICS LETTERS 2000年第14期36卷 1196-1197页

作者： Choi, SY Chae, SI Shim, YS Commun Technol Ctr Inst Adv Engn Yongin 449860 Kyonggi Do South Korea Seoul Natl Univ Dept Elect Engn Seoul 151742 South Korea

The authors propose a motion estimation (ME) algorithm fcr determining a motion vector which minimises the estimated total number of bits allocated to the motion vector and to the residual discrete cosine transform coefficients. This rate-optimised ME algorithm contributes to an improved reconstructed image quality and a reduced number of coding bits per frame.

关键词： motion vector Signal processing theory residual discrete cosine transform coefficients image quality motion estimation algorithm Codes estimated total number optimisation image coding reduced number rate-optimised motion estimation Computer vision and image processing techniques image processing and restoration motion estimation image and video coding Optimisation techniques vector quantisation rate-optimised ME algorithm discrete cosine transforms image sequences coding bits

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Moving object segmentation in DCT-based compressed video

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ELECTRONICS LETTERS 2000年第21期36卷 1769-1770页

作者： Ji, S Park, HW Korea Adv Inst Sci & Technol Dept Elect Engn Yusong Gu Taejon 305701 South Korea

A block-based automatic segmentation algorithm has been developed for detecting and tracking moving objects in DCT-based compressed video. The proposed algorithm segments moving objects with block resolution using the... 详细信息

关键词： moving object segmentation block resolution image and video coding Integral transforms in numerical analysis data compression image segmentation stochastic behaviour image blocks video signal processing DCT-based compressed video object recognition discrete cosine transforms video coding block-based automatic segmentation algorithm image recognition

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