Patent ID: 6377702
Filing Date: 2002-04-23
Classification: G06T,H04N

Abstract:
A method of color cast detection and removal comprising the steps of:providing a color image consisting of pixels; providing a color space having an achromatic axis and two chromatic axes; providing a default gray radius from the achromatic axis; establishing bins of neutral color in a chromatic plane; populating the bins with the pixels based on pixel chromaticity; computing a color histogram with chromaticity peaks for the pixels in the bins within the default gray radius; adjusting the default gray radius to a gray radius based on the chromaticity peaks in the color histogram; detecting color cast from a dominant chromaticity peak within the gray radius and color cast distance from the distance thereof from the achromatic axis; removing the color cast from the pixels by subtracting the color cast distance from the color image in the color space; and outputting a color cast removed color image.