Patent ID: 8654221
Filing Date: 2014-02-18
Classification: H04N

Abstract:
1. An image processing device configured to extract a contrast component for each pixel of an input image by removing a low-frequency component of said input image and to correct said contrast component for each pixel based on a gain value, comprising: input/output-property generating means configured to generate an input/output property curve, assuming an input contrast component which is said contrast component before correction as input, and an output contrast component which is said contrast component after correction as output, which is an input/output property curve of which said output contrast component monotonously increases as to said input contrast component; gain properties generating means configured to generate a gain property curve representing properties as to said input contrast component of said gain value for correcting said input contrast component to obtain said output contrast component based on said input/output property curve; gain-value calculating means configured to calculate said gain value for each pixel of said input image based on said gain property curve, a brightness value with gray level suppressed, and an overall brightness value; contrast emphasizing means configured to calculate a contrast-corrected brightness value for each pixel of said input image based on the gain value for each pixel of said input image, a brightness value of each pixel of said input image, and an overall brightness value of each pixel of an overall brightness image, the overall brightness image derived by extracting only low frequency components from the input image; and gray level correcting means configured to calculate a gray level corrected value for each pixel of said input image based on the brightness value of each pixel of said input image and the contrast-corrected brightness value of each pixel of said input image.