Multi-point motion picture encoding and decoding apparatus

Details Multi-point motion picture encoding and decoding apparatus Multi-point motion picture encoding and decoding apparatus

1995-05-15

1996-10-22

Metjahic, Safet

Television

Two-way video and voice communication

User positioning

348 16, H04N 715

Patent

active

055681840

ABSTRACT:
A display system for displaying a plurality of video windows on a display screen. A receiving element is included for receiving video data packets from a plurality of video sources in a time sharing manner, each of the 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 element is connected to the receiving element for decoding the coded video information extracted from each of the video data packets and for outputting a partial image corresponding to one of the blocks in the video frame. A set of frame memories are included for assembling partial images into video frames, each of the frame memories having a plurality of window areas located in a predetermined layout defined therein, and a set of the window areas each located at a same location within respective frame memories being associated with a same video source with respect to each other. A writing element is included for writing each partial image derived from the decoder element into one of the window areas within one of the 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 the window areas. Finally, an outputting element is included for selectively outputting contents of the frame memories on a display screen by changing over the frame memories depending upon a display position on the display screen thereby to present a plurality of video frames at a plurality of window areas on the display screen.

REFERENCES:
patent: 5001702 (1991-03-01), Teraslinna et al.
patent: 5157491 (1992-10-01), Kassatly
patent: 5231492 (1993-06-01), Dangi et al.
patent: 5365265 (1994-11-01), Shibata
patent: 5371535 (1994-12-01), Takizawa

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