Television – Bandwidth reduction system – Data rate reduction
Patent
1993-12-17
1995-11-07
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348392, 348395, 348397, 348416, 348419, 348420, H04N 726, H04N 728
Patent
active
054651182
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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Television Engineering Handbook, K. Blair Bension, pp. 19.11-19.12.
Hancock Steven M.
Pietras Mark A.
Chin Tommy P.
International Business Machines - Corporation
Jobse Bruce D.
Kudirka Paul E.
Rao Anand
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