METHOD AND SYSTEM FOR CONVERTING COLOR IMAGE TO GRAY SCALE IMAGE, GRAY SCALE IMAGE, METHOD FOR IMPROVING CONVERSION FROM COLOR TO GRAY SCALE, AND EDGE EMPHASIZING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method and system for improving the quality of gray scale images created from color images. SOLUTION: A high-pass filter is applied to at least one chrominance component of a color image to compute at least one chrominance component which has undergone high-pass filtering. On the basis of the chrominance component a brightness component of the color image is adjusted. COPYRIGHT: (C)2005,JPO&NCIPI