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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 期刊論文 >  Dynamic Region of Interest Transcoding for Multipoint Video Conferencing

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/12401

    Title: Dynamic Region of Interest Transcoding for Multipoint Video Conferencing
    Authors: Lin, Chia-Wen
    Chen, Yung-Chang
    Sun, Ming-Ting
    Date: 2003
    Publisher: Institute of Electrical and Electronics Engineers Inc.
    Keywords: Video conferencing
    Video recording
    Image quality
    Image coding
    Computational complexity
    Abstract: This paper presents a region of interest transcoding scheme for multipoint video conferencing to enhance visual quality. In a multipoint video conference, usually there are only one or two active conferees at one time, which are the regions of interest to the other conferees involved. We propose a dynamic sub-window skipping scheme to firstly identify the active participants from the multiple incoming encoded video streams by calculating the motion activity of each sub-window and then dynamically reduce the frame rates of the motion inactive participants by skipping these less-important sub-windows. The bits saved from the skipping operation are reallocated to the active sub-windows to enhance the regions of interest. We also propose a low-complexity scheme to compose, as well as trace, the unavailable motion vectors with a good accuracy in the dropped inactive sub-windows after performing sub-window skipping. Simulation results show that the proposed methods not only significantly improve the visual quality of the active sub-windows without introducing serious visual quality degradation in the inactive ones, but also reduce the computational complexity and avoid whole-frame skipping. Moreover, the proposed algorithm is fully compatible with the H.263 video coding standard.
    Relation Link: http://ieeexplore.ieee.org/Xplore/dynhome.jsp
    URI: http://nthur.lib.nthu.edu.tw/handle/987654321/12401
    Appears in Collections:[電機工程學系] 期刊論文
    [電腦與通訊科技研發中心] 期刊論文
    [腦科學研究中心] 期刊論文

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