Patent ID: 7764399

Claim:
An image processing apparatus for adjusting a saturation of an input image, the input image also comprising a lightness and a hue, said apparatus comprising: a first processing unit, storing a first look-up table, for deciding a gain curve in accordance with the lightness and the hue of the input image and the first look-up table; a second processing unit, storing a second look-up table, for deciding a normalized limit gain in accordance with the lightness and the hue of the input image and the second look-up table and for multiplying the saturation of the input image by the normalized limit gain to generate a normalized saturation; a third processing unit, coupled to the first processing unit and the second processing unit respectively and storing a third look-up table, for deciding a set of gain parameters in accordance with the gain curve and the third look-up table and for deciding a saturation gain in accordance with the normalized saturation and the set of gain parameters; and a first converter for adjusting the saturation of the input image in accordance with the saturation gain.