Patent ID: 7986852
Filing Date: 2011-07-26
Classification: H04N

Abstract:
1. An image processing apparatus for adjusting a lightness of an input image, the input image having a hue, the image processing apparatus comprising: a look-up table therein recording M lightness, N hues, and M*N lightness offset values, each of the M*N lightness offset values respectively corresponding to one of the M lightness and one of the N hues, and both M and N being nature numbers; a processing unit for storing the look-up table and selecting a corresponding lightness offset value from the look-up table according to the lightness and the hue of the input image; an adder, coupled to the processing unit, for obtaining an adjusted lightness by adding the lightness of the input image to the corresponding lightness offset value; a first converter coupled to the processing unit, the input image being in compliance with a first color space, the first converter being used for converting the input image from the first color space into a second color space, wherein the second color space defines a lightness component (L) and two color components (C a second converter, coupled between the first converter and the processing unit, the second converter being used for converting the two color components (C a third converter, coupled to the first converter, the third converter being used for converting the two color components (C a saturation adjusting unit respectively coupled to the second converter, the third converter, and the adder, the saturation adjusting unit being used for adjusting the saturation, according to the adjusted lightness and the hue, to obtain an adjusted saturation.