Variable direction filter for separation of luminance and chromi

Details Variable direction filter for separation of luminance and chromi Variable direction filter for separation of luminance and chromi

1985-10-03

1988-02-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 964

Patent

active

047274158

ABSTRACT:
Signal generating means formed by variable line delay circuits 6 and 9 and dot delay circuits 7 and 8 receives a series of signal sample of a composite color television signal sampled in synchronism with a chrominance subcarrier at a frequency four times the chrominance subcarrier frequency and generates simultaneously a sample signal at a specified sampled point for separating a luminance signal and a chrominance signal and sampled signals at four sample points adjacent to the specified sample point, namely, four sampled points on the upper, lower, right and left sides of the specified sample point. A comparing and determining circuit 10 compares and determines a direction in which there is little change in the picture, based on the sampled signals at the adjacent sample points. Based on the result of determination of the comparing and determining circuit 10, a selector 11 selects and provides two sampled signals 110 and 111 existing in a region where there is little change in the picture. A separation filter 12 separates a chrominance signal 105 from the sampled signal 102 at the specified sample point using the two sampled signals 110 and 111 provided from the selector 11. A subtractor 5 subtracts the chrominance signal 105 from the sampled signal 102 at the specified sample point so as to provide a luminance signal 106.

REFERENCES:
patent: 4050084 (1977-09-01), Rossi
patent: 4141035 (1979-02-01), Maxemchuk et al.
patent: 4352122 (1982-09-01), Reitmeier et al.
patent: 4376955 (1983-03-01), Reitmeier
patent: 4464686 (1984-08-01), Reitmeier
patent: 4626895 (1986-12-01), Reitmeier
"Digital TV Comb Filter with Adaptive Features", John P. Rossi, IERE Conf. Proc., pp. 267-282, (1976).

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