Color contour correction circuit of a color television receiver

摘要

A color television receiver includes a color contour correction circuit (130) that applies a color contour enhancement processing to each of color difference signals R-Y and B-Y. The color contour correction circuit includes an edge detection circuit (20) for detecting an edge portion of each color difference signal, a sample-hold circuit (22) for holding the amplitude value of a color difference signal to provide that value during a period corresponding to the edge portion of the detected color difference signal, and for providing the color difference signal as it is during a period other than the above-mentioned period, and a microcomputer (25) for detecting the color saturation of each color difference signal. In this color contour correction circuit, the reference level of the edge detection circuit for detecting an edge portion of each color difference signal is set in accordance with the color saturation of each color difference signal detected by the microcomputer.