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检索条件"主题词=Image and video coding"
281 条 记 录,以下是221-230 订阅
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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 b... 详细信息
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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 e... 详细信息
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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 optim... 详细信息
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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
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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 zer... 详细信息
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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.
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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 whic... 详细信息
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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 ... 详细信息
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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 dec... 详细信息
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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
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