Patent ID: 6788822
Filing Date: 2004-09-07
Classification: G06T

Abstract:
A method for correcting lightness of an image, comprising the steps of:calculating a first scale and a second scale, which correspond to an inputted image size, based on an image scale of an original image including a plurality of pixels from image information of the original image; multiscale retinex processing the original image with respect to the first scale and the second scale to produce a multiscale retinex processing result; calculating an offset correction value based on a histogram of a lightness value against the number of pixels of the original image; correcting said multiscale retinex processing result based on a gain correction value and said offset correction value to produce a corrected multiscale retinex processing result; and synthesizing said corrected multiscale retinex processing result with the image information of the original image to produce an output image.