Edge detecting method and edge detecting device which detects edges for each individual primary color and employs individual color weighting coefficients

摘要

An edge detecting method and an edge detecting device improve the accuracy in edge detection and extract the outline correctly even in the general image. In the case of detecting the picture element group which is changing rapidly as compared with its surroundings as the edge from within image data in which each picture element is composed of independent N numbers of dark and light data R, G, and B respectively, N sets of coefficients Wr, Wg, Wb corresponding to N numbers of dark and light data It, G, B respectively are calculated, and each picture element is judged whether it is edge or not depending upon N numbers of (lark and light data R, G, B and N sets of coefficients Wr, Wg, Wb.