Television – Bandwidth reduction system – Data rate reduction
Patent
1996-01-12
1999-11-09
Britton, Howard
Television
Bandwidth reduction system
Data rate reduction
348418, H04N 728
Patent
active
059824417
ABSTRACT:
A system and method is disclosed for representing each frame in a sequence of video frames in terms of a correlation between successive video frames. The system and method of the present invention segment the current video frame data and a previous frame into blocks for which motion vectors and/or affine mapping coefficients may be determined. The motion vectors may then be used to represent the current frame data without requiring periodic transmission of a base, self-referential frames of video data. Preferably, the compressor which generates the codewords to represent the current frame data subdivides the blocks of the current frame and previous frame buffers to further evaluate motion factors which may be used to represent current frame data. This evaluation is performed in a recursive manner and preferably includes evaluation of a bit rate/distortion factor to optimally select codewords for representing the current frame data. The bit rate parameters are generated by an entropy encoder which encodes the codewords generated by a compressor in a known entropy coding manner, such as Huffman encoding. Preferably, the decompressor for regenerating previous frames of video data includes a weighted mask filtering of the regenerated frames to reduce blocking artifacts in the regenerated frame data.
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Hurd Lyman P.
Kari Jarkko J.
Liang Gang
Britton Howard
Iterated Systems, Inc.
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