Patent ID: 7155060

Claim:
An image processing system for applying a predetermined image processing to image data of an image comprising a plurality of pixels, said image processing system including: a frame discriminating means which judges, when detecting a luminance distribution of the data pixel by pixel, a portion of the image data to be a frame portion on the basis of the image data if an extremely large number of certain pixels are included therein; and an image data converting means which excludes the image data of the pixels having been judged to be the frame portion, if any, and totals luminance values of the pixels into a luminance distribution as a whole, detects an expansion ratio of luminance that enables the luminance distribution from which the image data corresponding to the frame portion is excluded to expand into an effective luminance range over which the image data can spread, and converts information about luminance of each pixel in the image data by making use of the expansion ratio.