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Rate allocation for video transmission over lossy correlated networks

ELECTRONICS LETTERS 2002年第20期38卷 1171-1172页

作者： Gnavi, S Grangetto, M Magli, E Olmo, G Politecn Torino Dipartimento Elettron Ctr Multimedia Radio Commun I-10129 Turin Italy

A novel rate allocation algorithm for video transmission over lossy networks subject to bursty packet losses is presented. A Gilbert-Elliot model is used at the encoder to drive the selection of coding parameters. Experimental results using the H.26L test model show a significant performance improvement with respect to the assumption of independent packet losses.

关键词： H.26L test model image and video coding coding parameters lossy correlated networks visual communication video signal processing video transmission Gilbert-Elliot model video coding bursty packet losses rate allocation algorithm

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Map data watermarking using generalised square mask

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ELECTRONICS LETTERS 2002年第25期38卷 1645-1646页

作者： Kang, HI Kim, KI Choi, JU Myongji Univ Dept Informat Engn Yongin 449728 Kyunggi Do South Korea Myongji Univ Dept Elect Engn Next Generat Power Technol Ctr Yongin 449728 Kyunggi Do South Korea MarkAny Inc Seoul 100400 South Korea

An algorithm for watermark insertion and extraction on the vector image, such as map data, is presented. Most parts of the vector image, such as map data, consist of the array of the coordinate values. At first, the image is partitioned into blocks with the same area and every vertex coordinate value within a block is changed to a new coordinate value with an origin at the south-west vertex of the mask belonging to the associated block. According to the value of watermark, the insertion area is different. Unlike the work by Sakamoto et al, it should be possible to use a square mask of arbitrary size. The mask of the Sakamoto et al.'s, work is specific since the length of the mask is 2(R) - 1 where R = 1, 2,...., n. It is also shown that the proposed method is superior to the previous work against noise attack.

关键词： map data watermarking noise attack image and video coding noise data compression image coding generalised square mask feature extraction watermark extraction algorithm watermarking square mask vertex coordinate vector image Data security watermark insertion algorithm south-west vertex Computer vision and image processing techniques

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Shape-sequence-based key image generation algorithm for browsing and retrieval of video clips

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ELECTRONICS LETTERS 2002年第12期38卷 549-550页

作者： Lee, S Choi, YS Lim, W Kwon, TK Kim, HK Korea Telecom Multimedia Tech Lab Secho Gu Seoul 137792 South Korea Sejong Univ Dept Software Engn Kwangjin Gu Seoul 143747 South Korea

A new shape-sequence-based algorithm that can effectively generate key images from video clips is introduced. Generated key images can be used as the feature information in the browsing and retrieval of video clips from a multimedia database. Experiments with MPEG-7 data sets were performed, and the results are compared with existing methods.

关键词： Information retrieval techniques video clip browsing shape-based image composition technique continuous video frames shape variation multimedia database retrieval image recognition shape-sequence-based algorithm content-based retrieval Computer vision and image processing techniques video databases key image generation algorithm video clip retrieval image and video coding image retrieval Spatial and pictorial databases video signal processing video coding image sequences image recognition shape information

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Initial codebook design by modified splitting method

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ELECTRONICS LETTERS 2002年第12期38卷 606-607页

作者： Chehwang, C Department of Electronic Engineering Dongshin University Naju Chonnam 520-714 South Korea

A simple initialisation method is proposed for the vector quantisation codebook design algorithm. Simulation results show that the proposed method achieves a faster convergence rate and a better local minimum than the... 详细信息

关键词： image and video coding convergence rate convergence of numerical methods vector quantisation image coding local minimum Codes initial codebook design simulation results initialisation method image compression modified splitting method

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Object-based watermarking scheme robust to object manipulations

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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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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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Visual communication at limited colour display capability

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ELECTRONICS LETTERS 2002年第25期38卷 1657-1659页

作者： Lu, Y Gao, W Wu, F Harbin Inst Technol Dept Comp Sci Harbin 150001 Peoples R China Chinese Acad Sci Inst Comp Technol Beijing 100080 Peoples R China Microsoft Res Asia Beijing 100080 Peoples R China

A novel scheme for visual communication by means of mobile devices with limited colour display capability is proposed. A colour quantisation technique is first proposed based on the perception of the human visual system on skin colour. An efficient coding scheme is then developed to compress colour quantised video at very low bit rate.

关键词： colour display very low bit rate image and video coding skin colour image colour analysis mobile handsets visual communication mobile devices colour displays quantisation (signal) colour quantisation perception colour quantised video compression efficient coding video signal processing visual perception Display equipment and systems video coding human visual system

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Fast motion detection in compressed domain for video surveillance

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ELECTRONICS LETTERS 2002年第9期38卷 409-411页

作者： Pons, J Prades-Nebot, J Albiol, A Molina, J Univ Politecn Valencia Dept Informat Sistemas & Comp Valencia 46022 Spain Univ Politecn Valencia Dept Commun Valencia 46022 Spain

A fast algorithm to detect motion in the compressed domain for video surveillance is presented. The algorithm partially decompresses the video bit stream and performs motion detection from its quantised discrete cosine transform coefficients, Its very low computational cost makes this algorithm very useful when real-time motion detection has to be performed simultaneously in several video bit streams.

关键词： quantised discrete cosine transform coefficients Integral transforms in numerical analysis quantisation (signal) video surveillance real-time motion detection data compression fast motion detection motion detection computational cost Computer vision and image processing techniques surveillance motion estimation image and video coding video bit stream partially video bit stream decompression video signal processing compressed domain discrete cosine transforms video coding image sequences image recognition

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MPEG-4 video object-based rate allocation with variable temporal rates

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ELECTRONICS LETTERS 2002年第19期38卷 1088-1090页

作者： Lee, JW Vetro, A Wang, Y Ho, YS K JIST Puk Gu Kwangju South Korea MERL Murray Hill NJ USA Polytech Univ Brooklyn NY 11201 USA

In object-based coding, bit allocation is performed at the object level and temporal rates of different objects may vary. The proposed algorithm deals with these two issues when coding multiple video objects (MVOs). The proposed algorithm is able to successfully achieve the target bit rate, effectively code arbitrarily shaped MVOs with different temporal rates, and maintain a stable buffer level.

关键词： bit allocation variable temporal rates MPEG-4 video coding rate distortion theory image and video coding rate-distortion encoding multiple video objects video signal processing video coding object-based rate allocation

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Automatic prefilter control by video encoder statistics

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ELECTRONICS LETTERS 2002年第11期38卷 503-505页

作者： Lee, J Lucent Technol Whippany NJ 07981 USA

Noise in original uncompressed video typically degrades the performance of a video encoder. A prefilter is commonly used to remove the noise before compression. Automatic control of the prefilter based on encoder stat... 详细信息

关键词： interference suppression perceptual quality motion estimation motion vectors image and video coding noise removal Filtering methods in signal processing prediction error correlation methods video coding adaptive filters correlation factor video signal processing video encoder statistics Wiener filters automatic prefilter control adaptive Wiener filter

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