METHOD AND APPARATUS FOR IMAGE SIGNAL PROCESSING

摘要

PURPOSE: A method for processing an image signal and an apparatus thereof are provided to prevent the degradation of picture quality, by using an independent brightness and color difference image signal with decreased crosstalk characteristics. CONSTITUTION: An independent brightness and color difference image signal generator(120) converts a linear RGB signal into an independent brightness and color difference image signal with a brightness signal and a color difference signal. The brightness signal and the color difference signal become nonlinear respectively. The nonlinearity decreases crosstalk characteristics of the independent brightness and color difference image signal. An image signal encoder(180) encodes the independent brightness and color difference image signal. [Reference numerals] (110) Input image signal determination unit; (120) Independent brightness and color difference image signal generator; (130) RGB signal receiver; (132) Linear brightness signal generator; (134) Non-linear brightness signal generator; (136) RGB signal converter; (138) Color difference signal generator; (140) Brightness and color difference signal converter; (150) Color information detection unit; (152) Color information comparison unit; (160) Bit-depth converter; (170) Color difference signal down sampling unit; (180) Image signal encoder; (190) Quantization determination unit