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US 2008/0165397 A1Published application
Method and apparatus of color conversion
AssigneeNovatek Microelectronics Corp.
InventorHsin-I Lin
Life of this patent
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Abstract
A method and an apparatus of color-space conversion are provided herein. When adjustment of saturation and/or hue is performed on a RGB color signal, pixel luminance will be influenced to some extent. In the conversion method of the present invention, luminance compensation will be performed after global or local adjustment to keep the pixel luminance from being influenced by the color-space conversion. The luminance compensation method is to adjust a compensation value according to a ratio of an adjusted pixel luminance to an original pixel luminance.
Claims12
A method of color conversion, comprising:
- receiving a RGB color signal of a pixel;
- and
- performing a color-space conversion on the RGB color signal for adjusting saturation or hue thereof, wherein, luminance compensation is performed on the RGB color signal on which the saturation adjustment or the hue adjustment has been performed, to compensate the luminance of the RGB color signal influenced by the saturation adjustment or the hue adjustment.
A method of color conversion, comprising:
- receiving a RGB color signal of a pixel;
- performing saturation adjustment and hue adjustment on the RGB color signal;
- and
- performing a luminance compensation on the RGB color signal on which the saturation adjustment and the hue adjustment have been performed, to compensate the luminance of the RGB color signal influenced by the saturation adjustment and the hue adjustment.
1 more element
A method of color conversion based on RGB-HSI conversion, comprising:
- receiving a RGB color signal of a pixel;
- performing global saturation adjustment according to values of R, G, and B of the RGB color signal to obtain a global saturation adjustment signal;
- performing luminance compensation according to the luminance of the RGB color signal and that of the global saturation adjustment signal, to obtain a first color adjustment signal;
- receiving the first color adjustment signal, and performing global hue adjustment on the first color adjustment signal, to obtain a global hue adjustment signal;
- performing luminance compensation according to the luminance of the first color adjustment signal and that of the global hue adjustment signal, to obtain a second color adjustment signal;
- performing local saturation adjustment on the second color adjustment signal, to obtain a local saturation adjustment signal;
- performing luminance compensation according to the luminance of the second color adjustment signal and that of the local saturation adjustment signal, to obtain a third color adjustment signal;
- receiving the third color adjustment signal, and performing local hue adjustment on the third adjustment signal, to obtain a local hue adjustment signal;
- and
- performing luminance compensation according to the luminance of the third color adjustment signal and that of the local hue adjustment signal, to obtain a fourth color adjustment signal, wherein the fourth color adjustment signal is the color signal converted from the RGB color single in HSI color space.
7 more elements
An apparatus of color conversion, comprising:
- a color-space adjustment unit adapted for receiving a RGB color signal of a pixel, and for performing color-space conversion on the RGB color signal, so as to output a color adjustment signal after saturation and hue adjustments;
- and
- a luminance compensation unit, coupled to the color-space adjustment unit, and adapted for receiving the RGB color signal and the color adjustment signal, and for performing luminance compensation on the color adjustment signal according to the RGB color signal and the color adjustment signal, so as to compensate the luminance of the RGB color signal influenced by the saturation adjustment.
An apparatus of color conversion, comprising:
- a plurality of color-space adjustment units connected in series adapted for performing multiple color-space conversion operations on a RGB color signal of a pixel so as to output a color adjustment signal after saturation and hue adjustments;
- and
- a luminance compensation unit, coupled to the color-space adjustment units connected in series, and adapted for receiving the RGB color signal and the color adjustment signal, and for performing luminance compensation on the color adjustment signal according to the RGB color signal and the color adjustment signal, so as to compensate the luminance of the RGB color signal influenced by the saturation adjustment.
Dependencies are inferred from the claim text.