Circuit for adaptively separating luminance and color signals ba

Details Circuit for adaptively separating luminance and color signals ba Circuit for adaptively separating luminance and color signals ba

1995-06-15

1997-11-11

Burgess, Glenton B.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348665, 348667, H04N 978

Patent

active

056869720

ABSTRACT:
A technique for effectively separating luminance and color signals from a composite video signal in an NTSC-type television system sampled at 4 times the color subcarrier frequency in an NTSC type picture processing system includes steps for (1) delaying the composite video signal through a plurality of line and sample delay elements and then generating a plurality of sample signals; (2) detecting the correlations between a predetermined reference sample signal and the sample signals in the neighborhood which are in phase with the predetermined reference sample signal and then delaying the composite video signal; (3) determining any direction in which the luminance and color signals are separated and filtered; (4) separating and filtering the luminance and color signals from the composite video signal in the determined direction or in a plurality of predetermined directions; (5) detecting the vertical and horizontal correlation of sample signals which are out of phase with the reference sample signal and are separated from the reference sample signal in the upper/lower/left/right directions; and (6) selecting the luminance and color signals which have been separated and filtered in the separating and filtering step on the basis of the vertical and horizontal correlation. Circuitry suitable for performing the method described above is also described.

REFERENCES:
patent: 4839727 (1989-06-01), Tanaka et al.
patent: 5305095 (1994-04-01), Song
patent: 5367342 (1994-11-01), Bang
patent: 5475445 (1995-12-01), Yamaguchi et al.

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