Patent ID: 6804393
Filing Date: 2004-10-12
Classification: G06T

Abstract:
A method of calculating a noise characteristic value for a source digital image, comprising the steps of:a) receiving a source digital image including pixels corresponding to two or more different colors; b) using a spatial filter and the source digital image to calculate a residual digital image wherein the residual digital image includes color pixels each having pixel values corresponding to the two or more different colors of the source digital image pixels; c) using the color pixel values for each pixel of interest in the residual digital image to produce color correlation terms which respectively indicate the extent of the noise content in each of the pixels of interest; d) using the color correlation terms and the corresponding residual digital image pixel values to calculate a weighting coefficient for each pixel in the residual image and; e) using the residual digital image pixel values and the weighting coefficient to calculate a noise characteristic value for each of the two or more different colored pixels.