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Improved hiding data in images by optimal moderately-significant-bit replacement

ELECTRONICS LETTERS 2001年第16期37卷 1017-1018页

作者： Chan, CK Cheng, LM City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

An improved data hiding technique by optimal moderately-significant-bit replacement is presented, which can significantly reduce the computational cost and enhance the visual quality of the resulting stego-image.

关键词： computational cost data hiding technique image and video coding visual quality enhancement image coding stego-image optimal moderately-significant-bit replacement data encapsulation local pixel adjustment Computer vision and image processing techniques image enhancement

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Signal-dependent wavelet transform and application to lossless image compression

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ELECTRONICS LETTERS 2002年第4期38卷 170-172页

作者： Yoo, H Joeng, J Hanyang Univ Dept Elect Commun Engn Seoul 133791 South Korea

A signal-dependent wavelet transform based on the lifting scheme is proposed. The transform can be made reversible (i.e. an integer-to-integer transform). The reversible transform. followed by arithmetic coding, is applied to lossless image compression. Simulation results indicate that the proposed method is superior to the S + P method.

关键词： wavelet transforms arithmetic coding simulation lifting scheme data compression image and video coding arithmetic codes reversible transform signal-dependent wavelet transform Integral transforms image coding S+P method integer-to-integer transform lossless image compression Computer vision and image processing techniques image recognition

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Lossless image compression using ordered binary-decision diagrams

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ELECTRONICS LETTERS 2001年第3期37卷 162-163页

作者： Mateu-Villarroya, P Prades-Nebot, J Univ Politecn Valencia Dept Comun ETSITV Valencia 46022 Spain

A lossless compression algorithm for images based on ordered binary-decision diagrams (OBDDs) is presented. The algorithm finds an OBDD which represents the image exactly and then codes the OBDD efficiently. The resul... 详细信息

关键词： OBDD binary decision diagrams image and video coding data compression image coding Signal processing theory lossless compression algorithm Combinatorial mathematics lossless image compression Computer vision and image processing techniques ordered BDD ordered binary-decision diagrams

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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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Wavelet coding method using small block DCT

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ELECTRONICS LETTERS 2001年第10期37卷 627-629页

作者： Wang, J Zhang, WJ Yu, SY Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

A novel wavelet image compression method is introduced. The method applies the small block discrete cosine transform to certain parts of the wavelet coefficients before quantisation and coding. Experiments show that t... 详细信息

关键词： wavelet transforms wavelet image compression method image and video coding small block discrete cosine transform data compression Integral transforms in numerical analysis wavelet coding method image coding wavelet coefficients quantisation (signal) quantisation complexity discrete cosine transforms Signal processing theory small block DCT Computer vision and image processing techniques

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

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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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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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Rate control algorithm using SOFM-based neural classifier

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ELECTRONICS LETTERS 2000年第12期36卷 1041-1042页

作者： Park, GH Lee, YJ Yonsei Univ Dept Comp Sci Wonju 220710 Kwangwon South Korea

A neural-net based rate control algorithm for MPEG encoders is introduced. It is based on the global rate-distortion model constructed by a self-organising feature map. The performances of the proposed algorithm are better than those for MPEG-4 VM5+ frame-based rate control, based on the criteria of the average number of bits per Frame and PSNR.

关键词： rate distortion theory Neural nets global rate-distortion model Pattern recognition code standards MPEG encoders data compression rate control algorithm SOFM-based neural classifier self-organising feature map telecommunication computing image and video coding pattern classification neural-net based rate control algorithm Neural computing techniques self-organising feature maps video signal processing video coding image sequences Communications computing

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Wavelet image coding based on significance extraction using morphological operations

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IEE PROCEEDINGS-VISION image AND SIGNAL PROCESSING 1999年第4期146卷 206-210页

作者： Zhong, JM Leung, CH Tang, YY Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

An algorithm is proposed for improving Servetto et al.'s method of morphological representation of wavelet data (MRWD), which is among the most efficient wavelet-based image compression algorithms. In MRWD, morphological dilation is used to capture and encode the arbitrarily shaped clusters of significant coefficients within each subband and high compression is achieved. But there are still several deficiencies for rectification in MRWD. An efficient image compression algorithm is proposed, in which, for each subband, morphological dilation is first used to extract and encode the clustered significant coefficients, and the remaining space is encoded in an efficient way. Instead of encoding the large number of zeros one by one, only the small number of remaining significant coefficients and their positional information are encoded. Experimental results show that this improvement is very effective, especially for images with large and relatively smooth regions.

关键词： efficient image compression algorithm Combinatorial mathematics data compression transform coding positional information feature extraction significance extraction image representation Computer vision and image processing techniques wavelet image coding image coding wavelet-based image compression algorithms morphological representation Integral transforms in numerical analysis image and video coding wavelet data morphological dilation morphological operations mathematical morphology clustered significant coefficients wavelet transforms experimental results subband

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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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