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Visual communication at limited colour display capability

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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Improved embedded zerotree wavelet coder

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ELECTRONICS LETTERS 1999年第9期35卷 705-706页

作者： Kang, ES Tanaka, T Ko, SJ Korea Univ Dept Elect Engn Seoul 136701 South Korea Tokyo Inst Technol Grad Sch Sci & Engn Dept Elect & Elect Engn Tokyo 1528552 Japan

An improved embedded zerotree wavelet (IEZW) is presented, which can significantly reduce the scanning and symbol redundancy of the existing EZW.

关键词： wavelet transforms image and video coding Integral transforms in numerical analysis bit allocation scheme image coding symbol redundancy reduction redundancy scanning reduction Computer vision and image processing techniques embedded zerotree wavelet coder

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image watermarking scheme using visual model and BN distribution

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ELECTRONICS LETTERS 1999年第3期35卷 212-214页

作者： Kim, SW Suthaharan, S Lee, HK Rao, KR Monash Univ Fac Informat Technol Churchill Vic 3842 Australia KAIST Dept Comp Sci Taejon South Korea Univ Texas Dept Elect Engn Arlington TX 76019 USA

A watermarking scheme for digital images that is based on the characteristics of the human visual system is presented. The watermarking scheme inserts a perceptually invisible watermark in the discrete cosine transform domain. It is shown that the proposed scheme provides better results than two other popular schemes in terms of both transparency and robustness.

关键词： perceptually invisible watermark Integral transforms image and video coding Integral transforms in numerical analysis copyright BN distribution image coding DCT domain digital images discrete cosine transform domain visual model image watermarking scheme discrete cosine transforms copyright protection Computer vision and image processing techniques

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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 optimisation criteria. Instead of the traditional least squares error (LSE) criterion, a least squares weighted error (LSWE) criterion is used as the approximation criterion. Simulation results show that the LSWE approach is much better for region coding than the LSE approach.

关键词： optimisation least squares approximations approximation criterion image and video coding Optimisation techniques image coding least squares weighted error criterion LSWE criterion Interpolation and function approximation (numerical analysis) B-spline surface approximation region coding algorithm optimisation criteria splines (mathematics) Signal processing theory Computer vision and image processing techniques

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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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Modifications on morphology-based image coding

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ELECTRONICS LETTERS 2001年第7期37卷 421-422页

作者： Cai, ZH Subramanian, KR Cheng, TH Nanyang Technol Univ Sch EEE Singapore 639798 Singapore

An extension uf morphology-based image coding is presented. Tv achieve better coding efficiency neighbour coefficients are included into the significance m;ip predictor and different subband quantisers are employed to achieve the optimal quantiser fur each subband in a rare-distortion sense, Experimental results show. that about 0.4-0.7dB peak signal-to-noise ratio pain can be obtained.

关键词： coding efficiency rate-distortion sense image and video coding peak signal-to-noise ratio gain significance map predictor image coding optimal quantiser morphology-based image coding quantisation (signal) subband quantisers image morphing neighbour coefficients Computer vision and image processing techniques mathematical morphology

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Programmable processor for on-line computing of inverse Haar transform

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ELECTRONICS LETTERS 2001年第16期37卷 1050-1052页

作者： Martín, O Solana, JM Univ Cantabria Fac Ciencias Dept Elect & Computadores E-39005 Santander Spain

A processor for the one-dimensional inverse Haar transform (1D-IFHT) programmable for N = 8 up to N = 1024, with low latency data flow is presented. It enables on-line computing of both the normalised and the non-norm... 详细信息

关键词： Haar transforms normalised IFHT Integral transforms in numerical analysis image and video coding Digital signal processing chips online computing image encoding image coding one-dimensional inverse Haar transform Microprocessors and microcomputers single configurable FPGA chip digital signal processing chips programmable processor Computer vision and image processing techniques low latency data flow field programmable gate arrays nonnormalised IFHT

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Multiple-thread long-term memory scheme for efficient video coding

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ELECTRONICS LETTERS 1999年第17期35卷 1452-1453页

作者： Zhang, K Kittler, J Univ Surrey Sch EEIT&M CVSSP Guildford GU2 5XH Surrey England

It has been shown that a background memory can be used to improve the coding efficiency of a video codec. However, this solution is restricted to sequences with a stationary background. Such a restriction seriously limits the application of the background memory scheme. The authors combine the long-term memory scheme with a multiple-thread memory mechanism to boost the coding efficiency for a much wider application range. The experimental results confirm the effectiveness of the proposed method.

关键词： video codecs image and video coding video codec Digital storage video signal processing multiple-thread long-term memory scheme digital storage background memory video coding coding efficiency improvement Codecs, coders and decoders

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