Video signal processing apparatus

Details Video signal processing apparatus Video signal processing apparatus

1991-04-04

1992-12-22

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, H04N 146

Patent

active

051737698

ABSTRACT:
A color video signal processing apparatus includes an edge detecting circuit for detecting an edge portion of an image contained in color difference signals; a region dividing circuit for dividing the image, except the detected edge portion, into regions determined in accordance with the levels of the luminance signal; and an intra-region averaging circuit for averaging the color difference signals in the individual divided regions. The color difference signals in the edge portion are output directly, while the color difference signals in the divided regions are outputted after being averaged. Except in the edge portion where variations of the color difference signals are conspicuous, the image is divided into one or more regions determined in accordance with the luminance signal levels, and the color difference signals in the individual regions are averaged. Since the color difference signals are averaged in the portion where color variations are minimal, any video signal noise that causes color nonuniformity and so forth can be eliminated in such portion having little color variations.

REFERENCES:
patent: 3778543 (1975-12-01), Lowry
patent: 4663662 (1987-05-01), Sekizawa et al.
patent: 4677465 (1987-06-01), Alkofer
patent: 5119187 (1992-06-01), Ikeda et al.

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