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Multi-point motion picture encoding and decoding apparatus

  • US 5,790,179 A
  • Filed: 09/27/1996
  • Issued: 08/04/1998
  • Est. Priority Date: 12/21/1993
  • Status: Expired due to Fees
First Claim
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1. A terminal for displaying a plurality of video images on a display screen, comprising:

  • a receiver for receiving video data packets from a plurality of video sources in a time sharing manner, each of said video data packets including coded video information for representing a partial image contained within one of a plurality of blocks constituting a video frame, attribute information for indicating at least a location of a block corresponding thereto within the video frame and identification information of the video source;

    a decoder connected to said receiver for decoding the coded video information extracted from each of said video data packets and for outputting a partial image corresponding to one of said blocks in the video frame;

    a set of frame memories for assembling partial images into video frames, each of said frame memories having a plurality of image areas located in a predetermined layout defined therein, a set of said image areas each located at a same location within respective said frame memories being associated with a same video source with respect to each other;

    a recorder for writing each partial image derived from said decoder into one of said image areas within one of said frame memories which is specified in accordance with the identification information extracted from a video data packet related to the partial image and a utilization status of said image areas; and

    a selector for selectively outputting contents of said frame memories on a display screen by changing over said frame memories depending upon a display position on the display screen thereby to present a plurality of video frames at a plurality of image areas on the display screen.

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