Television – Bandwidth reduction system – Data rate reduction
Patent
1997-03-03
1999-12-28
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
382232, H04N 712
Patent
active
060088478
ABSTRACT:
A temporal compression and decompression system is disclosed for color video. A video stream with red, green and blue pixel element values is input to a first computer. In the first computer, a new frame of video data is compared to the frame being displayed on a second computer and the similarity between corresponding blocks and sub-blocks is represented with one tolerance result per sub-block. Based on the number of sub-blocks for which tolerance results exceed a preset threshold and a user-specified quality level, an update quality level is selected that determines the quality at which the frame update is transmitted from the first computer to the second computer. Before the frame update is transmitted the updating information is compressed in a two-stage process. In the first stage 5-bit red, blue and green element values in sub-blocks being updated are is converted to 3-bit categories. In the second stage groups of categories are converted to variable-length Huffman words. The Huffman words are then transmitted over a communications channel to the second computer, which decompresses and displays the updated sub-blocks.
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Keith Jack: Video Demystified: A Video Hanbook for the Digital Engineer 1996 http://www.mindspring.com--kjack1/color space.html Color Space Conversion: YcbCr Color Space 6 pages.
Chin Tommy P.
Connectix Corporation
Philippe Gims S.
LandOfFree
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