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Rate control algorithm using SOFM-based neural classifier

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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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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Segmentation approach using local image statistics

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ELECTRONICS LETTERS 2000年第14期36卷 1199-1201页

作者： Mendonça, AP da Silva, EAB COPPE IME BR-2290270 Rio De Janeiro Brazil UFRJ EEDEL COPPE PEE BR-21945970 Rio De Janeiro Brazil

An efficient segmentation technique is described that uses local application of the K-means method with feature vectors based on image statistics. it requires little computational effort and works well for different c... 详细信息

关键词： K-means method image segmentation feature vectors Signal processing theory image segmentation approach data compression computer vision image statistics Codes computational effort Probability theory, stochastic processes, and statistics image coding Computer vision and image processing techniques image processing and restoration image compression image and video coding Probability and statistics local image statistics statistical analysis

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Efficient significance map coding using block-based zerotree and quadtree

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ELECTRONICS LETTERS 2000年第13期36卷 1110-1111页

作者： Kim, HJ Lee, CW Seoul Natl Univ Sch Elect Engn Inst New Media & Commun Seoul 151742 South Korea

Far wavelet-based image coding, it is important to efficiently code the significance map for each bit plane. The proposed algorithm provides an effective method for coding the significance map by using block-based zerotree and quadtree decomposition, and demonstrates good R-D performance especially at low bit rates and for images with rich texture.

关键词： wavelet transforms significance map coding transform coding rate distortion theory image and video coding quadtrees Integral transforms wavelet-based image coding image coding rate-distortion performance bit plane block-based zerotree decomposition R-D performance image texture rich texture images Computer vision and image processing techniques block-based quadtree decomposition

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Direct 3D lossless image compression based on region growing

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ELECTRONICS LETTERS 2000年第3期36卷 207-208页

作者： Wu, D Tan, EC Nanyang Technol Univ Sch Appl Sci Singapore 639798 Singapore

A segmentation-based 3D lossless compression method that exploits the dependencies in all three dimensions of volumetric images is proposed.

关键词： image and video coding segmentation-based 3D lossless compression method data compression image segmentation region growing image coding Codes volumetric images direct 3D lossless image compression image processing and restoration image recognition Computer vision and image processing techniques

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Perceptually weighted optical flow for motion-based segmentation in MPEG-4 paradigm

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ELECTRONICS LETTERS 2000年第20期36卷 1693-1694页

作者： Malo, J Gutierrez, J Epifanio, I Ferri, FJ Univ Valencia Dept Opt Valencia 46100 Spain Univ Valencia Dept Informat Valencia 46100 Spain

In the MPEG-4 paradigm, the sequence must be described in terms of meaningful objects. This meaningful, high-level, representation should emerge from low-level primitives such as optical flow and prediction error which are the basic elements of previous-generation video coders. The accuracy of the high-level models strongly depends on the robustness of the primitives used. It is shown how perceptual weighting in optical flow computation gives rise to better motion estimates which consistently improve motion-based segmentation compared to equivalent unweighted motion estimates.

关键词： motion estimation MPEG-4 paradigm image and video coding image segmentation prediction error low-level primitives perceptually weighted optical flow video signal processing high-level representation robustness video coders video coding image sequences motion-based segmentation

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Temporal concealment of video transmission errors using grid-deformation motion model

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ELECTRONICS LETTERS 2000年第12期36卷 1019-1021页

作者： Atzori, L De Natale, FGB Perra, C Univ Cagliari DIEE I-09123 Cagliari Italy Univ Trent DICA I-38050 Trent Italy

A novel temporal concealment technique that uses a grid-deformation motion model is proposed. A triangular mesh is superimposed on the damaged area, grid nodes are displaced according to a temporal prediction, and an affine transform is applied to interpolate the missing area. Experimental results show significant improvements compared to previously proposed approaches.

关键词： interpolation image and video coding video transmission errors grid-deformation motion model mesh generation affine transform triangular mesh video signal processing Interpolation and function approximation (numerical analysis) Finite element analysis video coding temporal concealment decoding grid nodes

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Digital image watermarking based on multiresolution decomposition

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ELECTRONICS LETTERS 2000年第13期36卷 1108-1110页

作者： Niu, XM Lu, ZM Sun, SH Harbin Inst Technol Dept Automat Test & Control Harbin 150001 Peoples R China

A multiresolution watermarking method with grey-level watermarking is presented. Both the watermark and the original image are decomposed into three-level multiresolution structures using different mechanisms. The decomposed watermark information is further coded by error correction coding. Each level of watermark information is embedded into the corresponding level of the transformed image. Experimental results show that the proposed algorithm is robust against common image manipulations.

关键词： discrete wavelet transforms industrial property grey-level watermarking Integral transforms in numerical analysis image manipulations error correction codes digital image watermarking three-level multiresolution structures image and video coding image coding video signal processing transformed image multiresolution decomposition error correction coding DWT image sequences

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Motion adaptive intra refresh for MPEG-4

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ELECTRONICS LETTERS 2000年第23期36卷 1924-1925页

作者： Worrall, ST Sadka, AH Kondoz, AM Sweeney, P Univ Surrey Ctr Commun Syst Res Surrey GU2 7XH England

The sensitivity to error of a video bitstream often changes as the amount of motion within a scene changes. Taking this into account, a scheme that attempts to optimise error robustness by varying the amount of adapti... 详细信息

关键词： code standards motion estimation image and video coding data compression MPEG-4 adaptive intra refresh blocks error sensitivity video signal processing video bitstream error robustness optimisation Signal processing theory motion adaptive intra refresh coding errors video coding adaptive signal processing

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