YC separator for video signal processing circuit

Details YC separator for video signal processing circuit YC separator for video signal processing circuit

1988-10-20

1991-01-08

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, H04N 978

Patent

active

049840690

ABSTRACT:
In a YC separator for generating a chrominance signal C including no chrominance separation error by selecting a second highest potential signal of the first chrominance signal a, the second chrominance signal c' including a separation error and a reference signal, only when a picture having two different colors at a border between n-th line and (n-1)th line is displayed, a correction value of 1/2 is generated as the reference signal, in order to obtain C=1 and Y=0 for prevention of n-th line dot crawl. Further, when a vertical stripe picture (black and white lines are alternately arranged) is displayed, a chrominance signal Cc including much less unnecessary signal components can be obtained through an arithmetic circuit and on the basis of a chrominance signal Cc' including error components and an average signal D between the past and future line chrominance signals A and C, in order to eliminate cross-color at the upper and lower ends of the picture and Yc signal blur.

REFERENCES:
patent: 4345268 (1982-08-01), Clarke
patent: 4688080 (1987-08-01), Wagner
patent: 4703342 (1987-10-01), Takahashi
patent: 4907073 (1990-03-01), Sugiyama
patent: 4916527 (1990-04-01), Matsuo
European Search Report: EP 88 30 9897.

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