Patent ID: 7518617
Filing Date: 2009-04-14
Classification: G06K

Abstract:
1. An image processing apparatus for adjusting a saturation of an input image also having a lightness and a hue, said image processing apparatus comprising: a look-up table for recording M lightness values, N hue values and M*N correction parameters, each of the parameters corresponding to one of the M lightness values and one of the N hue values, wherein N and M are natural numbers; a processing unit for storing the look-up table, determining a corresponding parameter in accordance with the lightness of the input image, the hue of the input image, and the look-up table to calculate a saturation gain in accordance with the corresponding correction parameter; and a multiplier, coupled to the processing unit, for multiplying the saturation of the input image by the saturation gain to get an adjusted saturation; wherein the lightness has i binary high bits, the hue has k binary high bits, i and k are natural numbers, each of the M lightness values in the look-up table is expressed as an i-bit binary, and each of the N hue values is expressed as a k-bit binary, the lightness has j binary low bits, the hue has p binary low bits, j and p are natural numbers, each of the M*N correction parameters comprises a gain G, a lightness offset L offset, and a hue offset H offset, and the saturation gain G j binary is the value of the j binary low bits, and p binary is the value of the p binary low bits.