EDGE DETECTION CIRCUIT, EDGE DETECTION METHOD, DENOISING CIRCUIT AND DENOISING METHOD

摘要

PPROBLEM TO BE SOLVED: To surely detect an edge which rises or falls gradually, by applying to, for instance, removal of mosquito noise in image data, in relation to an edge detection circuit, an edge detection method, a denoising circuit and a denoising method. PSOLUTION: A ratio RTO of energy of an AC component (ALL PW-DC PW) to energy C1 PW by a discrete cosine conversion coefficient of a first base X(1) is calculated. PCOPYRIGHT: (C)2007,JPO&INPIT