Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-02-21
1991-04-30
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 964
Patent
active
050123297
ABSTRACT:
A digital decoder for an encoded video signal has three stages. The first stage applies a multi-dimensional digital chrominance bandpass filter to the digitized encoded video signal to produce a chrominance signal, subtracting the chrominance signal from the digitized encoded video signal to produce a luminance signal. The second stage detects edges and peaks in the chrominance signal, and corrects the luminance signal where such edges and peaks are detected to produce a chrominance corrected luminance signal without dot crawl errors. An intermediate corrected chrominance signal may also be derived from the second stage. The third stage filters the chrominance signal, or intermediate corrected chrominance signal, to reduce peaks in the chrominance signal as well as to enhance edges to produce a corrected chrominance signal with minimized cross color errors.
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Fairhurst Jon
Lang Stuart E.
Britton Howard W.
Dubner Computer Systems, Inc.
Gray Francis I.
Greening Wendy R.
Smith-Hill John
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