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Predictive vector quantisation for image compression

ELECTRONICS LETTERS 1998年第24期34卷 2325-2326页

作者： Tsai, JC Hsieh, CH Chinese Army Acad Dept Elect Engn Kaohsiung 830 Taiwan I Shou Univ Dept Informat Engn Kaohsiung 840 Taiwan

A new vector quantisation algorithm is presented which fully exploits the interblock correlation of an image. For an input block, a predicted block from the previously encoded data is searched. If the prediction is good enough, only a Bag code is sent to the receiver. The algorithm results in a significant reduction in bit rate with better picture quality, as compared to the conventional full-search VQ.

关键词： predictive algorithm picture quality image and video coding flag code vector quantisation image coding prediction theory image compression bit rate data encoding interblock correlation

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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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Pel-recursive motion estimation algorithm

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ELECTRONICS LETTERS 2001年第21期37卷 1285-1286页

作者： Gharavi, H Reza-Alikhani, H US Dept Commerce Natl Inst Stand & Technol Gaithersburg MD 20899 USA Loughborough Univ Technol Loughborough LE11 3TU Leics England

A new pel-recursive motion estimation algorithm for video coding applications is presented. The derivation of the algorithm is based on recursive least-squares estimation that minimises the mean-square prediction error. A comparison with the modified steepest-descent gradient estimation technique algorithm shows significant improvement in terms of mean-square prediction error performance.

关键词： recursive least-squares estimation motion estimation image and video coding pel-recursive motion estimation algorithm modified steepest-descent gradient estimation algorithm mean-square prediction error Interpolation and function approximation (numerical analysis) video coding recursive estimation image recognition least mean squares methods

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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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Object boundary padding technique for improving MPEG-4 video compression efficiency

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ELECTRONICS LETTERS 1999年第17期35卷 1453-1455页

作者： Edirisinghe, EA Jiang, J Grecos, C Univ Loughborough Dept Comp Sci Loughborough Leics England Univ Glamorgan Sch Comp Pontypridd CF37 1DL M Glam Wales

In MPEG-4. the boundary macro-blocks of reference video objects are padded by replicating the boundary samples towards the exterior. The authors propose the introduction of a linear extrapolation based pre-padding step to minimise prediction errors. Experimental results indicate that gains of up to 7% can be achieved for boundary macro-block coding by this proposed technique.

关键词： code standards boundary macro-blocks linear extrapolation pre-padding step data compression boundary macro-block coding prediction errors minimisation image and video coding MPEG-4 video compression object boundary padding technique video signal processing reference video objects Interpolation and function approximation (numerical analysis) extrapolation coding errors video coding compression efficiency improvement

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Fast algorithm for computing modulated lapped transform

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ELECTRONICS LETTERS 2001年第12期37卷 796-797页

作者： Jing, CY Tai, HM Snap On Diagnost Lincolnshire IL 60069 USA Univ Tulsa Dept Elect Engn Tulsa OK 74104 USA

A fast algorithm for computing the modulated lapped transform (MLT) is proposed. This method is based on the combination of a fast MLT via a type-IV discrete cosine transform (DCT-IV) algorithm and a fast DFT:based DCT-IV algorithm. II is achieved by defining a new data-shuffling scheme. The proposed algorithm is very suitable for efficient programmable logic device (PLD) implementation.

关键词： data-shuffling scheme fast algorithm Integral transforms in numerical analysis programmable logic device implementation Signal processing theory cosine modulated filter bank transforms filtering theory data compression discrete Fourier transforms fast DFT-based DCT-IV algorithm modulated lapped transform audio coding image coding PLD implementation suitability image and video coding Filtering methods in signal processing Computational complexity type-IV DCT algorithm Speech and audio coding discrete cosine transform algorithm discrete cosine transforms computational complexity

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Efficient block-based coding of noisy images by combining pre-filtering and DCT

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ELECTRONICS LETTERS 1999年第20期35卷 1717-1719页

作者： Kim, SD Jang, SK Kim, MJ Ra, JB Korea Adv Inst Sci & Technol Dept Elect Engn Yusong Gu Taejon 305701 South Korea

An efficient block-based coding scheme for noisy images is proposed. Unlike a conventional encoder where pre-filtering, discrete cosine transforms (DCT), quantisation, and variable length coding (VLC) are cascaded, the proposed image coder has only a modified DCT and a VLC, and performs pre-filtering and quantisation simultaneously in the modified DCT operation.

关键词： block-based coding VLC discrete cosine transforms pre-filtering Integral transforms in numerical analysis image and video coding DCT noisy images image coding Codes quantisation (signal) variable length coding quantisation Signal processing theory variable length codes Computer vision and image processing techniques image recognition block codes

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Motion-compensated compression of 3D animation models

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ELECTRONICS LETTERS 2001年第24期37卷 1445-1446页

作者： Ahn, JH Kim, CS Kuo, CCJ Ho, YS K JIST Puk Gu Kwangju 500712 South Korea Univ So Calif Los Angeles CA 90089 USA

A new algorithm is proposed to compress animated 3D mesh models. First, an input mesh model is partitioned into segments, and each segment is motion compensated from that of the previous time instance. Then. the motion residuals are effectively compressed by using a transform coding method. It is shown that the proposed algorithm yields a much higher compression ratio than the MPEG-4 codec.

关键词： 3D animation models image segmentation Signal processing theory Graphics techniques data compression animated 3D mesh models mesh segmentation inter-mesh coding compression algorithm image coding prediction theory motion-compensated compression motion compensation input mesh model partitioning transform coding method Computer vision and image processing techniques transform coding image and video coding computer animation motion-compensated prediction

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Leaky-bucket based rate control algorithm for C_VBR video encoding

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ELECTRONICS LETTERS 1999年第18期35卷 1529-1530页

作者： Bai, JF Liao, QM Lin, XG Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

A rate control algorithm is presented for constrained variable bit rate (C_VBR) encoding to make the compressed video stream more friendly to the user network interface (UNI) than in free VER coding. Experiments show that the algorithm would not only meet the delay constraint and traffic contract of VER transfer so as to avoid the cell loss over UNI, bur also benefit the statistical multiplexing by reducing the burstiness of the MPEG encoded stream.

关键词： leaky bucket image and video coding rate control algorithm statistical multiplexing C VBR video encoding traffic contract video coding constrained variable bit rate encoding user network interface delay constraint

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