Patent ID: 7508457
Filing Date: 2009-03-24
Classification: G09G,H04N

Abstract:
1. A video signal processor circuit comprising: a histogram generator circuit which receives a luminance signal compatible with a plurality of pixels, divides the luminance signal compatible with said plurality of pixels in a constant unit into a plurality of signal level regions for each constant signal level range, arbitrarily sets the constant signal level range when the luminance signal is divided into said plurality of signal level regions, and detects a rate of pixels included in each signal level to all the pixels in the constant unit to generate a histogram; a correction coefficient storage circuit which stores a correction coefficient after the correction coefficient has been set; a computing circuit which receives the histogram and the correction coefficient, calculates a correction value with respect to a signal level in said each signal level region in response to the histogram and the correction coefficient, and adjusts input and output characteristics of the luminance signal on the basis of the correction value; and a correcting circuit which receives the luminance signal, the correcting circuit being connected to the computing circuit, and gamma-correcting and outputting the luminance signal in accordance with the input and output characteristics adjusted by the computing circuit.