Patent ID: 11887549
Assignee: LX SEMICON CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 9:
10. A color gamut mapping device comprising:
a preprocessor configured to extract and output grayscale differences between first three-color signals of an input image and extract and output brightness values of the first three-color signals;
a color space converter configured to convert the first three-color signals supplied from the preprocessor into a first luminance component and a pair of first chrominance components and output the first luminance component and the pair of first chrominance components;
a hue calculator configured to calculate and output a hue angle using the first chrominance components;
a hue axis selection unit configured to select and output hue axes of a corresponding control area in which the calculated hue angle is located among a plurality of control areas divided by a plurality of hue axes having different hue angles;
a parameter calculator configured to calculate and output a plurality of parameters including a plurality of saturation gains and a plurality of hue gains using a plurality of parameters, which are set to correspond to the selected hue axes, and the calculated hue angle;
a saturation controller configured to control a saturation of the first chrominance component for each control area using the calculated saturation gains and output a second chrominance component;
a hue controller configured to control a hue of the second chrominance component for each control area using the calculated hue gains and output a third chrominance component;
an overall controller configured to interpolate a set value of a luminance gain using grayscale differences between the first three-color signals supplied from the preprocessor, output a second luminance component by controlling the first luminance component using the interpolated luminance gain, and output a fourth chrominance component by controlling a saturation of the third chrominance component according to the brightness values supplied from the preprocessor; and
a color space inverse converter configured to inversely convert the fourth chrominance component and the second luminance component, which are supplied from the overall controller into second three-color signals, and output the second three-color signals.