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检索条件"主题词=Image and video coding"
281 条 记 录,以下是151-160 订阅
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Rate allocation for video transmission over lossy correlated networks
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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. Exp... 详细信息
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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 i... 详细信息
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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 fr... 详细信息
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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
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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 em... 详细信息
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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 ap... 详细信息
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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 syst... 详细信息
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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 cosin... 详细信息
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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). T... 详细信息
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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
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