Patent ID: 8179478
Filing Date: 2012-05-15
Classification: H04N

Abstract:
1. A color image quality adjusting system comprising: a color signal conversion unit, which receives and converts a color video signal source into component video signals including a luminance signal and chrominance signals; a calibration parameter generation unit, which receives and carries out calculation on the color video signal source to obtain a hue value of the color video signal source and bases on the hue value to obtain at least one hue calibration parameter, at least one chroma calibration parameter, and at least one luminance calibration parameter in accordance with a hue and chroma and brightness mapping look-up table; a hue and chroma conversion and adjustment unit, which receives the chrominance signals generated by the color signal conversion unit and subsequently subjects the chrominance signals to coordinate transformation in accordance with the hue calibration parameter and signal multiplication operation in accordance with the chroma calibration parameter to generate output chrominance signals; and a luminance conversion and adjustment unit, which receives the chrominance signals generated by the color signal conversion unit and subjects the chrominance signals to addition operation in accordance with the luminance calibration parameter by means of an adder to generate an output luminance signal; wherein the luminance conversion and adjustment unit comprises a luminance coefficient correction unit, which receives and carries out luminance coefficient correction on the chrominance signals generated by the color signal conversion unit, followed by multiplication with the luminance calibration parameter generated from the calibration parameter generation unit in a multiplier to obtain a corrected luminance calibration parameter, the corrected luminance calibration parameter being then added with an all-region luminance calibration parameter in an adder to obtain an overall luminance calibration parameter, which serves as the luminance calibration parameter for the luminance conversion and adjustment unit for generation of the output luminance signal.