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检索条件"主题词=Image and video coding"
281 条 记 录,以下是161-170 订阅
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Oblivious robust watermarking method by image pre-processing
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ELECTRONICS LETTERS 2002年 第14期38卷 702-704页
作者: Agung, IW Sweeney, P Univ Surrey CCSR Guildford GU2 7XH Surrey England
A method of image watermarking which requires no original image for detection is introduced. The proposed scheme pre-processes the original image and embeds the watermark in some parts of the transform coefficients. I... 详细信息
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Data scheduling scheme for power reduction in DWT-based image coders
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ELECTRONICS LETTERS 2002年 第9期38卷 408-409页
作者: Seth, K Srinivasan, S Indian Inst Technol Dept Elect Engn Madras 600036 Tamil Nadu India
A new memory data scheduling scheme is used for designing a two-dimensional discrete wavelet transform (2D-DWT) core for ASIC implementation. This scheme reduces by 20 to 30% the overall switching activity in the 2D-D... 详细信息
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image fragile watermarking based on fusion of multi-resolution tamper detection
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ELECTRONICS LETTERS 2002年 第24期38卷 1512-1513页
作者: Hu, JQ Huang, JW Huang, DR Shi, YQ Sun Yat Sen Univ Sch Informat Sci & Technol Guangzhou 510275 Peoples R China New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA
A new discrete wavelet transform-based image fragile watermarking scheme exploiting the features of the human visual system is presented. Fusion of multi-resolution tamper detections, and mathematical morphology opera... 详细信息
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Distortionless data hiding based on integer wavelet transform
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ELECTRONICS LETTERS 2002年 第25期38卷 1646-1648页
作者: Xuan, GR Zhu, J Chen, JD Shi, YQ Ni, ZC Su, W Tongji Univ Dept Comp Sci Shanghai Peoples R China New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA
A novel distortionless image data hiding algorithm based on integer wavelet transform that can invert the stego-image into the original image without any distortion after the hidden data are extracted is proposed. Thi... 详细信息
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VLSI architecture for quadtree-based fractal image coding
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IEE PROCEEDINGS-COMPUTERS AND DIGITAL TECHNIQUES 2001年 第4-5期148卷 141-146页
作者: Lee, S Omachi, S Aso, H Tohoku Univ Grad Sch Engn Dept Elect & Commun Engn Aoba Ku Sendai Miyagi 9808579 Japan
A VLSI architecture for flexible-size fractal image coding is proposed. The main features of this architecture are that it is capable of performing fractal image coding based on quadtree partitioning without the exter... 详细信息
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Progressive image coding using set partitioning in hierarchical tree algorithm and embedded trellis-coded quantiser
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ELECTRONICS LETTERS 2001年 第9期37卷 561-563页
作者: Hu, MY Tang, TB Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore
A progressive image-coding algorithm that uses a combination of the set partitioning in hierarchical tree (SPIHT) algorithm and an embedded trellis-coded quantiser (E-TCQ) is proposed. Using the hierarchical quadtree ... 详细信息
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Pre-processing of SPIHT for lossy image coding
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ELECTRONICS LETTERS 2001年 第11期37卷 687-688页
作者: Zhu, J Lawson, S Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England
A simple but efficient pre-processing step for SPIHT (set partitioning in hierarchical trees) image coding is proposed. It reduces the computational complexity and increases the performance for lossy image coding.
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Watermark embedded in permuted domain
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ELECTRONICS LETTERS 2001年 第2期37卷 80-81页
作者: Yen, JC Natl Lien Ho Inst Technol Dept Elect Engn Maioli Taiwan
A scheme is proposed in which a watermark is transformed and then used to modify the third, fourth, or fifth bit of the pixels in a permuted image according to a chaotic binary sequence. The PSNR is larger than 44dB a... 详细信息
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Constrained VQ codebook design for noisy channels
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ELECTRONICS LETTERS 2001年 第10期37卷 662-664页
作者: Chang, WW Hsu, HI Natl Chiao Tung Univ Dept Commun Engn Hsinchu Taiwan
A codebook design approach for constrained vector quantisation using the Hadamard transform of channel transition probabilities is proposed. It is examined for quantisation of Gauss-Markov sources over channels with m... 详细信息
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Very low bit rate video coding using virtual SPIHT
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ELECTRONICS LETTERS 2001年 第1期37卷 40-42页
作者: Khan, E Ghanbari, M Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England
A virtual SPIHT (VSPIHT) technique that is based on the SPIHT and virtual zero-tree concepts is proposed. It combines virtually generated zero trees on the top of SPIHT's zero trees to reduce the effective number ... 详细信息
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