Patent ID: 8654140

Claim:
An image processor that corrects an image signal supplied to an image display section, comprising: a luminance component correction amount calculating section that calculates an amount of correction of a luminance component of the image signal according to a visual environment for an image signal only in a predetermined luminance level range less than a luminance level range of an entire image and in a predetermined spatial frequency band; a luminance component correcting section that corrects the luminance component of the image signal using the amount of correction calculated by the luminance component amount calculating section; a frequency analysis section configured to analyze a spatial frequency of the luminance component of the image signal, wherein the luminance component correction amount calculating section calculates the amount of correction using a luminance ratio of outside light and output light of the image display section as the visual environment, the luminance component correction amount calculating section calculating the amount of the correction of the luminance component of the image signal based on the luminance ratio and an analysis result of the frequency analysis section; a color difference component correcting section that corrects a color difference component of the image signal such that a value of xy chromaticity does not change before and after correction using the luminance component correcting section; a color difference component correction amount calculating section which calculates the amount of correction of the color difference component of the image signal such that the value of xy chromaticity does not change, on the basis of luminance components of the image signal before and after correction using the luminance component correcting section, wherein the color difference component correcting section corrects the color difference component of the image signal using the amount of correction of the color difference component calculated by the color difference component correction amount calculating section; and an adjustment parameter storage section that stores an adjustment parameter of the color difference component, wherein assuming that a luminance component before correction is Yin, a luminance component after correction is Yout, and the adjustment parameter is b, the color difference component correcting section corrects the color difference component by multiplying the color difference component of the image signal by a color difference gain of (1−b×(−Yout/Yin)).