Patent ID: 7394932

Claim:
An apparatus for processing an input video signal comprising: a generator to generate histogram data which indicates distribution of each of a plurality of levels at which a luminance signal component of the input video signal is divided from the lowest to the highest luminance level per specific unit of image; a producer to produce at least a first gain based on the distribution of the histogram data; a processor to process at least the first gain and the histogram data to produce a plural number of data for a gradation correction curve; a gradation corrector to generate the gradation correction curve based on the plural number of data and correct the input video signal based on the gradation correction curve; a chrominance gain producer to produce a chrominance gain based on the input video signal and an output video signal of the gradation corrector; and a chrominance corrector to correct a chrominance signal component of the input video signal based on the chrominance gain.