Patent ID: 8736723

Claim:
An image processing system which performs a predetermined image processing with respect to an image signal, the system comprising: a multiresolution decomposition section for decomposing the image signal to a high frequency component and a low frequency component at an nth stage, n being an integer equal to or larger than 1; a correction coefficient calculation section for calculating a correction coefficient with respect to the high frequency component; a correction section for correcting the high frequency component based on the correction coefficient; and a multiresolution composition section for composing a corrected image signal based on the corrected high frequency component and the low frequency component, wherein the correction coefficient calculation section includes a gradation correction coefficient calculation section for calculating a gradation correction coefficient with respect to the high frequency component at an ith decomposition stage, i being an integer equal to or larger than 1, and equal to or smaller than n, based on the low frequency component at the ith decomposition stage and on a visual system adaptation model, wherein the gradation correction coefficient calculation section calculates the gradation correction coefficient based on following equation: T i ( x,y )= L′ i ( x,y )/ L i ( x,y ), where the low frequency component at the ith decomposition stage is set to Li(x,y) (x and y denote the coordinate position of the respective frequency components at the ith decomposition stage in the x and y directions) the gradation correction coefficient with respect to the high frequency component at the ith decomposition stage is set to Ti(x,y) is obtained from L i (x,y) by the visual system adaptation model.