Patent
1992-10-21
1994-06-07
Bowler, Alyssa H.
395152, 395125, G06F 1300, G06F 300
Patent
active
053197933
ABSTRACT:
A personal computer system is operated to concurrently execute threads of multitasking operations to capture motion video data from a video source, compress such data, and record the compressed data in a file. Compression is selectively done in either one of two modes, an inter-frame compression mode and a intra-frame compression mode, both modes being block-oriented. During intra-frame compression, homogenous blocks are used to represent four pixel values with a single pixel value when the four pixels in a block are perceptually similar. During inter-frame compression, unchanged blocks are used to represent four pixel values as unchanged from the preceding frame when the four pixels are perceptually similar to the same four pixels in the preceding frame. Additionally, inter-frame compressed video frames use homogenous blocks to represent four pixel values with a single pixel when the four pixel values in a block are perceptually similar to each other but are perceptually different from the same four pixels in the previous frame.
REFERENCES:
patent: 4743959 (1988-05-01), Frederiksen
patent: 5164819 (1992-11-01), Music
patent: 5177608 (1993-01-01), Ohki et al.
Hancock Steven M.
Pietras Mark A.
Rodriguez Arturo A.
Bogdon Bernard D.
Bowler Alyssa H.
Harrity John
International Business Machines - Corporation
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