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Technique for designing biorthogonal wavelet filters with an application to image compression

ELECTRONICS LETTERS 1999年第18期35卷 1530-1532页

作者： Zhao, Y Swamy, MNS Concordia Univ Dept Elect & Comp Engn Ctr Signal Proc & Commun Montreal PQ H3G 1M8 Canada

A technique for designing new symmetric biorthogonal wavelets from a given symmetric regular filter is presented. The main idea is to find a symmetric complementary filter of a given regular filter such that it has the least mean square (LMS) amplitude deviation from the ideal halfband lowpass filter. New biorthogonal wavelet filter pairs can be obtained via factoring the product of the complementary polynomial and the given binomial. By pplying these new symmetric biorthogonal wavelet filters to the compression of some complicated images an improved result in reducing artefacts may be achieved.

关键词： wavelet transforms halfband low-pass filter Integral transforms image and video coding data compression design image coding LMS complementary filter binomial polynomial symmetric biorthogonal wavelet filter Filters and other networks image compression low-pass filters least mean squares methods

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Optimal vertex adjustment method using a Viterbi algorithm for vertex-based shape coding

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ELECTRONICS LETTERS 1999年第9期35卷 706-707页

作者： Lee, JH Chung, JW Kim, JK Korea Adv Inst Sci & Technol Dept Elect Engn Taejon 305701 South Korea Hyundai Elect Ind Co Ltd Informat & Telecommun R&D Ctr Seoul 137070 South Korea

An optimal vertex adjustment method is presented for vertex-based shape coding. The method optimally shifts the vertices, selected by a conventional vertex selection method, within the window that satisfies the allowable maximum distortion using a Viterbi algorithm. Experimental results show that the proposed method reduces the approximation distortion of the contour by similar to 30% for the same rate over a wide range of distortion, compared with the conventional method.

关键词： vertex selection method approximation distortion reduction image and video coding Viterbi decoding vertex-based shape coding Viterbi algorithm image coding vectors Computer vision and image processing techniques optimal vertex adjustment method

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Bandwidth renegotiation scheme for VBR video services

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ELECTRONICS LETTERS 1999年第18期35卷 1509-1510页

作者： Casilari, E Sandoval, F Univ Malaga Dept Tecnol Elect ETSI Telecomun E-29071 Malaga Spain

The authors show how the existence of long term variability in variable bit rate (VBR) video traffic imposes the need for bandwidth renegotiation. In particular. two simple scenarios with a fixed renegotiation interval are considered. Using a real MPEG trace the renegotiation scheme is evaluated to prove its benefits in tens of bandwidth gain and quality of sen;ice. The problem of renegotiation demonstrates the need for modelling long term variability in VER traffic.

关键词： VBR video services image and video coding renegotiation scheme evaluation telecommunication traffic MPEG trace visual communication variable bit rate video traffic VBR encoding bandwidth gain bandwidth renegotiation scheme long term variability video coding quality of service

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Visual communication at limited colour display capability

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ELECTRONICS LETTERS 2002年第25期38卷 1657-1659页

作者： Lu, Y Gao, W Wu, F Harbin Inst Technol Dept Comp Sci Harbin 150001 Peoples R China Chinese Acad Sci Inst Comp Technol Beijing 100080 Peoples R China Microsoft Res Asia Beijing 100080 Peoples R China

A novel scheme for visual communication by means of mobile devices with limited colour display capability is proposed. A colour quantisation technique is first proposed based on the perception of the human visual system on skin colour. An efficient coding scheme is then developed to compress colour quantised video at very low bit rate.

关键词： colour display very low bit rate image and video coding skin colour image colour analysis mobile handsets visual communication mobile devices colour displays quantisation (signal) colour quantisation perception colour quantised video compression efficient coding video signal processing visual perception Display equipment and systems video coding human visual system

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VQ-based digital image watermarking method

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ELECTRONICS LETTERS 2000年第14期36卷 1201-1202页

作者： Lu, ZM Pan, JS Sun, SH Harbin Inst Technol Dept Automat Test & Control Harbin 150006 Peoples R China Natl Kaohsiung Inst Technol Dept Elect Engn Kaohsiung 80782 Taiwan

A vector-quantisation (VQ)-based watermarking method is presented which utilises the codebook expansion technique. This method is efficient, provides enhanced security and the watermarked image is robust against the effects of VQ compression. Moreover, the watermark extraction can be performed without the original image. Experimental results are presented which demonstrate the effectiveness of this algorithm.

关键词： watermark extraction image and video coding data compression VQ compression image coding VQ-based digital image watermarking method Codes codebook expansion technique robust vectors vector-quantisation based watermarking method image processing and restoration security enhanced security Computer vision and image processing techniques

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Region coding using improved B-spline surface approximation

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ELECTRONICS LETTERS 2000年第2期36卷 129-130页

作者： Pan, JH Liao, QM Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

A new arbitrary region coding algorithm using a B-spline surface is presented. Pixels in the coded region are regarded as valid image data, and the parameters of the B-spline surface are calculated under certain optimisation criteria. Instead of the traditional least squares error (LSE) criterion, a least squares weighted error (LSWE) criterion is used as the approximation criterion. Simulation results show that the LSWE approach is much better for region coding than the LSE approach.

关键词： optimisation least squares approximations approximation criterion image and video coding Optimisation techniques image coding least squares weighted error criterion LSWE criterion Interpolation and function approximation (numerical analysis) B-spline surface approximation region coding algorithm optimisation criteria splines (mathematics) Signal processing theory Computer vision and image processing techniques

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Fast motion detection in compressed domain for video surveillance

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ELECTRONICS LETTERS 2002年第9期38卷 409-411页

作者： Pons, J Prades-Nebot, J Albiol, A Molina, J Univ Politecn Valencia Dept Informat Sistemas & Comp Valencia 46022 Spain Univ Politecn Valencia Dept Commun Valencia 46022 Spain

A fast algorithm to detect motion in the compressed domain for video surveillance is presented. The algorithm partially decompresses the video bit stream and performs motion detection from its quantised discrete cosine transform coefficients, Its very low computational cost makes this algorithm very useful when real-time motion detection has to be performed simultaneously in several video bit streams.

关键词： quantised discrete cosine transform coefficients Integral transforms in numerical analysis quantisation (signal) video surveillance real-time motion detection data compression fast motion detection motion detection computational cost Computer vision and image processing techniques surveillance motion estimation image and video coding video bit stream partially video bit stream decompression video signal processing compressed domain discrete cosine transforms video coding image sequences image recognition

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Improved embedded zerotree wavelet coder

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ELECTRONICS LETTERS 1999年第9期35卷 705-706页

作者： Kang, ES Tanaka, T Ko, SJ Korea Univ Dept Elect Engn Seoul 136701 South Korea Tokyo Inst Technol Grad Sch Sci & Engn Dept Elect & Elect Engn Tokyo 1528552 Japan

An improved embedded zerotree wavelet (IEZW) is presented, which can significantly reduce the scanning and symbol redundancy of the existing EZW.

关键词： wavelet transforms image and video coding Integral transforms in numerical analysis bit allocation scheme image coding symbol redundancy reduction redundancy scanning reduction Computer vision and image processing techniques embedded zerotree wavelet coder

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MPEG-4 video object-based rate allocation with variable temporal rates

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ELECTRONICS LETTERS 2002年第19期38卷 1088-1090页

作者： Lee, JW Vetro, A Wang, Y Ho, YS K JIST Puk Gu Kwangju South Korea MERL Murray Hill NJ USA Polytech Univ Brooklyn NY 11201 USA

In object-based coding, bit allocation is performed at the object level and temporal rates of different objects may vary. The proposed algorithm deals with these two issues when coding multiple video objects (MVOs). The proposed algorithm is able to successfully achieve the target bit rate, effectively code arbitrarily shaped MVOs with different temporal rates, and maintain a stable buffer level.

关键词： bit allocation variable temporal rates MPEG-4 video coding rate distortion theory image and video coding rate-distortion encoding multiple video objects video signal processing video coding object-based rate allocation

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image watermarking scheme using visual model and BN distribution

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ELECTRONICS LETTERS 1999年第3期35卷 212-214页

作者： Kim, SW Suthaharan, S Lee, HK Rao, KR Monash Univ Fac Informat Technol Churchill Vic 3842 Australia KAIST Dept Comp Sci Taejon South Korea Univ Texas Dept Elect Engn Arlington TX 76019 USA

A watermarking scheme for digital images that is based on the characteristics of the human visual system is presented. The watermarking scheme inserts a perceptually invisible watermark in the discrete cosine transform domain. It is shown that the proposed scheme provides better results than two other popular schemes in terms of both transparency and robustness.

关键词： perceptually invisible watermark Integral transforms image and video coding Integral transforms in numerical analysis copyright BN distribution image coding DCT domain digital images discrete cosine transform domain visual model image watermarking scheme discrete cosine transforms copyright protection Computer vision and image processing techniques

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