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Oblivious robust watermarking method by image pre-processing

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

关键词： message authentication watermark embedding Integral transforms in numerical analysis image and video coding copy protection oblivious watermarking method image coding digital watermark transform coefficients robust watermarking method discrete cosine transforms Computer vision and image processing techniques image pre-processing DCT coefficients

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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-DWT core and hence leads to lower power consumption at the expense of a slight reduction in the quality of reconstructed images and a slight increase in the chip area. This scheme is particularly useful in applications such as wireless Internet and laptop computers, in which picture quality can be traded-off for reduced power consumption.

关键词： processor scheduling DWT-based image coders 2D discrete wavelet transform core Integral transforms in numerical analysis 2D-DWT core mobile radio chip area data scheduling scheme application specific integrated circuits image processing equipment reconstructed image quality Internet power reduction Multiprocessing systems wireless Internet applications Semiconductor integrated circuits memory data scheduling scheme image coding laptop computers power consumption ASIC implementation Pattern recognition and computer vision equipment Computer vision and image processing techniques image reconstruction discrete wavelet transforms picture quality overall switching activity image and video coding image recognition Signal processing and conditioning equipment and techniques

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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 operations are developed for accurate tamper detection. As a result, malicious tamper and the tampered regions can be detected, while toleration towards high quality lossy image compression is achieved.

关键词： Integral transforms in numerical analysis image authentication image fragile watermarking discrete wavelet transform message authentication data compression watermarking multi-resolution tamper detection mathematical morphology operations image coding Data security Computer vision and image processing techniques malicious tamper tampered regions discrete wavelet transforms transform coding image and video coding lossy image compression visual perception image resolution human visual system

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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. This algorithm hides data into one (or more) middle bit-plane(s) of the integer wavelet transform coefficients in the middle and high frequency subbands. It can embed much more data compared with the existing distortionless data hiding techniques and satisfy the imperceptibility requirement. The image histogram modification is used to prevent greyscales from possible overflowing. Experimental results have demonstrated the validity of the algorithm.

关键词： wavelet transforms transform coding image and video coding Integral transforms in numerical analysis stego-image inversion integer wavelet transform image coding feature extraction data encapsulation distortionless image data hiding algorithm image histogram modification integer wavelet transform coefficients high frequency subbands middle frequency subbands Data security Computer vision and image processing techniques invertible data hiding

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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 external memory for the fixed domain pool and uses only local data communication. Since large domain blocks consist of small domain blocks, the calculations of distortion for all kinds of domain block are performed using only the domain pool, which is extracted from the smallest range blocks of the neighbouring processors. This architecture has a fast comparison module which can compute the distortions between a range block and the eight isometric transformations of domain blocks by one full rotation around the centre.

关键词： Pattern recognition and computer vision equipment smallest range blocks fractals Combinatorial mathematics fast comparison module VLSI architecture VLSI isometric transformations File organisation local data communication flexible-size fractal image coding Graphics techniques Semiconductor integrated circuits Computer vision and image processing techniques large domain blocks image coding quadtrees quadtree partitioning Signal processing and conditioning equipment and techniques distortion image processing equipment image and video coding neighbouring processors small domain blocks quadtree based fractal image coding Signal processing theory

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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 structure, a significant map of coefficients is encoded. The E-TCQ is then used to refine the amplitude of the method. It is shown that this method gives good performance, with very little increase in computational complexity and storage memory.

关键词： significant map of coefficients encoding hierarchical quadtree structure image and video coding quadtrees image coding quantisation (signal) embedded trellis-coded quantiser trellis codes SPIHT algorithm progressive image-coding algorithm set partitioning in hierarchical tree algorithm Computer vision and image processing techniques computational complexity

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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.

关键词： trees (mathematics) set theory Combinatorial mathematics image and video coding image coding pre-processing Computational complexity computational complexity lossy image coding set partitioning Computer vision and image processing techniques hierarchical trees SPIHT

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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

关键词： image and video coding chaotic binary sequence data compression permuted domain chaos binary sequences copy protection image coding compression ratio PSNR watermark Computer vision and image processing techniques

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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

关键词： block codes noise Integral transforms in numerical analysis speech coding Gauss-Markov sources noisy channels Codes probability speech compression constrained VQ codebook design image coding genetic algorithms Hadamard transforms image compression image and video coding Optimisation techniques vector quantisation channel transition probabilities Speech and audio coding constrained vector quantisation block code selection Hadamard transform

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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 of zero trees. The simulation results show that the proposed video coder is more efficient compared to SPIHT based video coders, particularly at very low bit rates.

关键词： trees (mathematics) set partitioning in hierarchical trees VSPIHT algorithm image and video coding video coder virtual SPIHT video signal processing very low bit rate video coding virtual zero-tree concept Combinatorial mathematics video coding decoding

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