Color signal contour compensator for matching the rise times of

Details Color signal contour compensator for matching the rise times of Color signal contour compensator for matching the rise times of

1992-01-29

1993-10-05

Powell, Mark R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358162, 358166, H04N 5208

Patent

active

052510182

ABSTRACT:
A color signal contour compensator includes an A/D converter, signal processors for processing the digital composite video signal output from the A/D converter into separate color and luminance signals, a color signal rise time compensator for detecting the rise time of the color signal output from the signal processors so as to output a delay control signal, a D/A converter for converting the color signal of the color and luminance signals output from the color signal rise time compensator into an analog signal during a period corresponding to a specific level of the delay control signal output from the color signal rise time compensator, a microcomputer including a memory device for storing a predetermined amplitude absolute value of the color signal, a rise time value of the luminance signal, and a delay value for delaying the luminance and color signals. The compensator matches the rise time of the color signal to the relatively short rise time of the luminance signal, thereby sharpening the contour of a picture during playback and improving the picture quality.

REFERENCES:
patent: 3798353 (1974-03-01), Illetschko
patent: 3859544 (1975-01-01), Nero
patent: 4739395 (1988-04-01), Juhanndeiter et al.
patent: 4912551 (1990-03-01), Ozaki
patent: 5038206 (1991-08-01), Ubukata

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