Patent attributes
The invention discloses an image processing apparatus for adjusting the saturation of an input image. The input image also has lightness and hue. The image processing apparatus includes a first processing unit, a second processing unit, a third processing unit, and a converter. According to the lightness, hue, and a first LUT, the first processing unit determines a gain curve. According to the lightness, hue, and a second LUT, the second processing unit determines a normalized limit gain and multiplies the normalized limit gain by the saturation of the input image to generate a normalized saturation. According to the gain curve and a third LUT, the third processing unit determines a set of gain parameters and, according to the normalized saturation and the gain parameters, determines a gain of saturation. According to the gain of saturation, the converter is used for adjusting the saturation of the input image.
