Patent ID: 6198843
Filing Date: 2001-03-06
Classification: G06T,H04N

Abstract:
A method for color gamut mapping comprising the steps of:converting a colorimetric value of an original image to a device value of an output device in which colorimetric values of the original image outside a gamut of the output device are converted to device values within the gamut;inversely-converting the device value obtained by said converting step to a second colorimetric value;extracting the gamut by performing a threshold process with respect to a norm between the colorimetric value of the original image and the second colorimetric value;filtering a color difference between the original image and an image to be output by said output device which is formed of the second colorimetric value obtained by said inversely-converting step with a spatial frequency filter; andoptimizing the image to be output by said output device so as to minimize an evaluation function related to a sum of the gamut from said extracting step and a filtered difference from said filtering step, thereby providing an image for which color gamut mapping has been performed.