Correlation adaptive luminance and chrominance signal separating

Details Correlation adaptive luminance and chrominance signal separating Correlation adaptive luminance and chrominance signal separating

1991-06-14

1993-07-06

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

052258998

ABSTRACT:
A correlation adaptive luminance and chrominance separating circuit includes: a line comb-filtering circuit for comb-filtering the input composite video signal; a vertical correlation adaptive circuit for detecting each vertical correlation from the comb-data outputted from the line comb-filtering circuit and selecting one of the comb-data according to the detected vertical correlation; a horizontal band pass filter circuit for inversely and reinversely delaying the video signal supplied from the vertical correlation adaptive circuit and producing the chrominance signal data and the vertical correlation data from the video signals; a horizontal correlation adaptive circuit for detecting a horizontal correlation from the horizontal correlation data and selecting one of the chrominance signal data according to the detected horizontal correlation; and a luminance and chrominance signal output portion for receiving the video signal and chrominance signal supplied from the line comb-filtering circuit and a horizontal correlation adaptive circuit, respectively, to output the finally separated luminance signal and chrominance signal. The circuit prevents the hanging dot and dot crawl, improving the image quality.

REFERENCES:
patent: 4688080 (1987-08-01), Wagner
patent: 4819062 (1989-04-01), Dongil
patent: 4979023 (1990-12-01), Tsinberg
patent: 4994906 (1991-02-01), Moriwake

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