Patent ID: 6332036
Filing Date: 2001-12-18
Classification: G06T,H04N

Abstract:
An apparatus for extracting color from an image signal, comprising:input signal processing means for obtaining a luminance signal and chrominance signals from an input image signal;color table managing means for producing, as a reference, a signal indicating a color area by searching a preset table based on a signal level of the luminance signal;control means for setting in advance tables corresponding to signal levels of the luminance signal in the color table managing means;color area comparing means for judging whether a color of the input image signal belongs to the reference color area by comparing the signal indicating the reference color area with signal levels of the chrominance signals; andstoring means for accumulating a color extraction result for the input image signal that is obtained as a comparison output of the color area comparing means;means for calculating, for each of the color models, the number of color extraction results indicating that the color of the input image signal belongs to the reference color area; andmeans for calculating, for each of the color models, positional information and distribution information of in the image based on the number of color extraction results indicating that the color of the input image signal belongs to the reference color area and positions of those color extraction results in the image, wherein the storing means stores calculation results independently for the respective color models;wherein the control means sets a plurality of color models in tables of the color table managing means;wherein the color table managing means produces, as references, signals indicating color areas for the respective color models by searching the tables in which the plurality of color models are set based on the signal level of the luminance signal;wherein the color area comparing means judges whether the color of the input image signal belongs to the reference color areas by comparing the signals indicating the reference color areas with the signal levels of the chrominance signals; and furtherwherein the storing means accumulates color extraction results for the input image signal that are obtained as comparison outputs of the color area comparing means, the color extraction results being combined as unit data for each position in an image.