Patent ID: 6023304
Filing Date: 2000-02-08
Classification: H04N

Abstract:
A method of correcting image quality comprising:a first amplifying step for amplifying a signal relating to color with a first variable gain to output an amplified signal relating to color;controlling the first variable gain on the basis of a preset voltage value;detecting color density from the amplified signal relating to color;extracting a high-frequency component of a luminance signal;a second amplifying step for amplifying the extracted high-frequency component of the luminance signal with a second variable gain to output a second amplified signal;controlling said second amplifying step by increasing the second variable gain when the detected color density is high and reducing the second variable gain when the detected color density is low;further controlling said second amplifying step in accordance with the amplified signal relating to color;slicing the second amplified signal at a prescribed value to produce an image quality correction signal; andcombining the image quality correction signal with the luminance signal and thereby outputting a corrected luminance signal.