Contour detecting filter device using PAL samples of composite v

Details Contour detecting filter device using PAL samples of composite v Contour detecting filter device using PAL samples of composite v

1986-02-06

1987-11-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358166, H04N 5208

Patent

active

047061138

ABSTRACT:
A contour detecting filter device samples composite video signals of the PAL system by sampling signals at a frequency four times the chrominance subcarrier frequency thereof through an A-D converter (2), to input sampling value series thus sampled in a delay circuit group (81-84). Detected from the delay circuit group are four sampling values (P1, P2, P4, P5) which are point-symmetrically positioned around a noted sampling value (P3) on the screen and having the same-phased chrominance subcarriers. The noted sampling value and the four sampling values are employed to perform arithmetic on second order differentiations in the direction of horizontal scanning lines and in the vertical direction on the screen by a coefficient multiplier (85), an adder (86) and a multiplier (87), thereby to detect the contour signal of the noted sampling value. Therefore, it is not necessary to separate luminance signals from the composite video signals, from which the contour signals can be directly detected.

REFERENCES:
patent: 3732360 (1973-05-01), Breimer et al.
patent: 4368483 (1983-01-01), Liu
patent: 4377820 (1983-03-01), Reitmeier
patent: 4381519 (1983-04-01), Wilkinson et al.

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