HISTOGRAM CONTROL PICTURE QUALITY CORRECTING CIRCUIT

PROBLEM TO BE SOLVED: To provide a histogram control picture quality correcting circuit for generating a correction curve such that an intermediate-range part does not vary in input/output characteristic and no abrupt-gradient part is present. SOLUTION: The histogram control picture quality correcting circuit comprises a pixel sampling processing part which extracts one pixel for N pixels (N: a natural number), a distribution detection part which comprises a plurality of counters and counts according to luminance levels of pixels extracted by the pixel sampling processing part to detect a histogram distribution, and a correction curve generation part which limits projecting outputs from counters of the distribution detection part, and generates correction curves of a low-gradation side and a high-gradation side of input luminance levels and output luminance levels separated by at least one specified fixed pint and then connecting them at the fixed point to generate a total correction curve. COPYRIGHT: (C)2005,JPO&NCIPI