Luminance transition coding method for software motion video compression/decompression
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United States of America Patent
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Jun 18, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Dec 17, 1993
priority date (Note) -
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Abstract
An digital video image processing system employs codes of various lengths to encode the luminance information within the digital video images. The inventive method and apparatus divides a video image into non-overlapping regions containing a plurality of pixels with luminance values. Within each region, the method computes the total luminance variation across the region, the direction of greatest luminance change within the region, the base, or lowest, luminance value within the region and the location and type of luminance transition within the region. Depending on the variation of the luminance values within a region and on the quality desired in the decoded image, the computed information is used to encode the luminance values in short, medium, or long codes. The luminance codes may be predetermined and unchanging or they may vary from image to image or within given images.
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