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Object-based watermarking scheme robust to object manipulations

ELECTRONICS LETTERS 2002年第25期38卷 1656-1657页

作者： Guo, J Shi, PF Shanghai Jiao Tong Univ Inst Image Proc & Pattern Recognit Shanghai 200030 Peoples R China

A new video watermarking scheme is proposed to resist object manipulations. Shape-adaptive DCT and a visual mask were combined to embed the shuffled watermark into the arbitrarily-shaped object. Inertia ellipse was employed to achieve fast self-synchronising watermark detection. Experiments show that the algorithm is robust to geometrical attacks.

关键词： Integral transforms in numerical analysis object searching shuffled watermark embedding shape-adaptive DCT fast self-synchronising watermark detection geometrical attacks data compression video watermarking watermarking object indexing visual mask inertia ellipse object-based watermarking transform coding image and video coding object manipulation robustness video signal processing discrete cosine transforms video coding MPEG-4

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Low-complexity overlapped block motion estimation using pattern-based pixel matching

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ELECTRONICS LETTERS 1999年第2期35卷 137-138页

作者： Lee, SH Kim, JK Korea Adv Inst Sci & Technol Dept Elect Engn Yusong Gu Taejon 305701 South Korea

A novel motion estimation method is presented which significantly reduces the computational complexity of overlapped block motion estimation (OBME). To eliminate the computationally intensive multiplications of OBME, the proposed method uses a predetermined pattern in selecting matched pixels within a window support. Simulation results show that the proposed method achieves about the same prediction performance as the conventional approach.

关键词： motion estimation window support pattern-based pixel matching image and video coding matched pixels prediction performance predetermined pattern Computational complexity video signal processing overlapped block motion estimation video coding image matching computational complexity

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Still image compression based on 2D discrete wavelet transform

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ELECTRONICS LETTERS 1999年第22期35卷 1934-1935页

作者： Tan, RHG Zhang, JF Morgan, R Greenwood, A Liverpool John Moores Univ Sch Engn Liverpool L3 3AF Merseyside England

The objective of this Letter is to develop new techniques for enhancing the compression of still images. The features of the proposed algorithm include: (i) zero mapping, which exploits the inherent self-similarity of wavelet coefficients at different scales, (ii) adaptive scanning, and (iii) data packing. Our algorithm outperforms both JPEG and the embedded zerotree wavelet (EZW) algorithm.

关键词： still image compression discrete wavelet transforms image and video coding inherent self-similarity data compression adaptive scanning Integral transforms in numerical analysis 2D discrete wavelet transform image coding data packing wavelet coefficients zero mapping Computer vision and image processing techniques

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Improved hiding data in images by optimal moderately-significant-bit replacement

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ELECTRONICS LETTERS 2001年第16期37卷 1017-1018页

作者： Chan, CK Cheng, LM City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

An improved data hiding technique by optimal moderately-significant-bit replacement is presented, which can significantly reduce the computational cost and enhance the visual quality of the resulting stego-image.

关键词： computational cost data hiding technique image and video coding visual quality enhancement image coding stego-image optimal moderately-significant-bit replacement data encapsulation local pixel adjustment Computer vision and image processing techniques image enhancement

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Signal-dependent wavelet transform and application to lossless image compression

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ELECTRONICS LETTERS 2002年第4期38卷 170-172页

作者： Yoo, H Joeng, J Hanyang Univ Dept Elect Commun Engn Seoul 133791 South Korea

A signal-dependent wavelet transform based on the lifting scheme is proposed. The transform can be made reversible (i.e. an integer-to-integer transform). The reversible transform. followed by arithmetic coding, is applied to lossless image compression. Simulation results indicate that the proposed method is superior to the S + P method.

关键词： wavelet transforms arithmetic coding simulation lifting scheme data compression image and video coding arithmetic codes reversible transform signal-dependent wavelet transform Integral transforms image coding S+P method integer-to-integer transform lossless image compression Computer vision and image processing techniques image recognition

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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 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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Lossless image compression using ordered binary-decision diagrams

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ELECTRONICS LETTERS 2001年第3期37卷 162-163页

作者： Mateu-Villarroya, P Prades-Nebot, J Univ Politecn Valencia Dept Comun ETSITV Valencia 46022 Spain

A lossless compression algorithm for images based on ordered binary-decision diagrams (OBDDs) is presented. The algorithm finds an OBDD which represents the image exactly and then codes the OBDD efficiently. The resul... 详细信息

关键词： OBDD binary decision diagrams image and video coding data compression image coding Signal processing theory lossless compression algorithm Combinatorial mathematics lossless image compression Computer vision and image processing techniques ordered BDD ordered binary-decision diagrams

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Wavelet image coding based on significance extraction using morphological operations

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IEE PROCEEDINGS-VISION image AND SIGNAL PROCESSING 1999年第4期146卷 206-210页

作者： Zhong, JM Leung, CH Tang, YY Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

An algorithm is proposed for improving Servetto et al.'s method of morphological representation of wavelet data (MRWD), which is among the most efficient wavelet-based image compression algorithms. In MRWD, morphological dilation is used to capture and encode the arbitrarily shaped clusters of significant coefficients within each subband and high compression is achieved. But there are still several deficiencies for rectification in MRWD. An efficient image compression algorithm is proposed, in which, for each subband, morphological dilation is first used to extract and encode the clustered significant coefficients, and the remaining space is encoded in an efficient way. Instead of encoding the large number of zeros one by one, only the small number of remaining significant coefficients and their positional information are encoded. Experimental results show that this improvement is very effective, especially for images with large and relatively smooth regions.

关键词： efficient image compression algorithm Combinatorial mathematics data compression transform coding positional information feature extraction significance extraction image representation Computer vision and image processing techniques wavelet image coding image coding wavelet-based image compression algorithms morphological representation Integral transforms in numerical analysis image and video coding wavelet data morphological dilation morphological operations mathematical morphology clustered significant coefficients wavelet transforms experimental results subband

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Efficient SPIHT-based embedded colour image coding techniques

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ELECTRONICS LETTERS 2001年第15期37卷 951-952页

作者： Khan, E Ghanbari, M Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England

Proposed are two novel composite spatial orientation trees for SPIHT-based colour image codecs to link wavelet coefficients of three colour planes together. The simulation results show the improved performance of the ... 详细信息

关键词： video codecs trees (mathematics) image and video coding image colour analysis colour image coding techniques image coding SPIHT-based image coding techniques colour image codecs wavelet coefficients colour planes set partitioning hierarchical trees Combinatorial mathematics Signal processing theory Computer vision and image processing techniques composite spatial orientation trees

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Wavelet coding method using small block DCT

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ELECTRONICS LETTERS 2001年第10期37卷 627-629页

作者： Wang, J Zhang, WJ Yu, SY Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

A novel wavelet image compression method is introduced. The method applies the small block discrete cosine transform to certain parts of the wavelet coefficients before quantisation and coding. Experiments show that t... 详细信息

关键词： wavelet transforms wavelet image compression method image and video coding small block discrete cosine transform data compression Integral transforms in numerical analysis wavelet coding method image coding wavelet coefficients quantisation (signal) quantisation complexity discrete cosine transforms Signal processing theory small block DCT Computer vision and image processing techniques

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