Hwang Dae Hwan, Cho Kyu Seob

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 5, No. 8, pp. 1972-1984, Aug. 1998
10.3745/KIPSTE.1998.5.8.1972,   PDF Download:

Abstract

Multimedia communication services have been realized by the development of video compression technology and the construction of ATM network which support to transport massive information. Both ITU-T H.261 and ISO/IEC MPEG are recommended as standards for compression of the moving video for multimedia communication. The MPEG that is usually used for storage of media is extending the scope of application to miscellaneous fields including Video on Demand(VoD), distance lecturing, video-phone and multipoint video conferencing, and thus the necessity to process such a moving video in real time has increased greatly in recent years. Particularly, Continuous Presence(CP) mechanism to make composite the multiple videos on a screen is an useful technology to be actually applied to VoD and multipoint video conferencing services. In this paper, we investigated the current CP mechanism used for manipulating multiple videos, and then propose an new CP algorithm for MPEG-1/2 video. A proposed algorithm using the difference of resolution for incoming and outgoing video can combine these up to four sources by partially modifying the syntax on Variable Length Code(VLC). Although this method that do the function of split-screen on the compressed code is restricted within processing of videos up to four sources, it has the advantages that can be easily implemented and process video in real-time. Through the computer simulation combining 4 MPEG-1/2 Source Input Format(SIF) videos, we confirmed the validity of an algorithm proposed in this paper, finally we had designed a system applying an proposed algorithm to the continuous presence video bridge in Multipoint Control Unit(MCU) for multipoint video-conferencing.

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