Color conversion device and method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMASAKO ASAMURA, SHUICHI KAGAWA, YOSHIKO HATANO, HIROAKI SUGIURA
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Abstract
A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.
Claims20
A color conversion device comprising:
- calculating means for calculating maximum and minimum values β and α of image information for each pixel;
- hue data calculating means for calculating hue data r, g, b, y, m and c based on the image information, and the maximum and minimum values β and α outputted from said calculating means;
- means for generating comparison-result data based on said hue data outputted from said hue data calculating means;
- first calculating means for performing calculation on outputs from said comparison-result data generating means and said hue data outputted from said hue data calculating means;
- second calculating means for performing calculation on said hue data outputted from said hue data calculating means;
- coefficient generating means for generating predetermined matrix coefficients;
- and
- means for performing matrix calculation using the comparison-result data from said comparison-result data generating means, outputs from said first and second calculating means, the hue data from said hue data calculating means, the minimum value α from said calculating means and the coefficients from said coefficient generating means, to thereby obtain color-converted image information.
A color conversion method for obtaining color-converted image information, comprising the steps of:
- calculating maximum and minimum values β and α of image information for each pixel;
- calculating hue data r, g, b, y, m and c based on said image information and said calculated maximum and minimum values β and α;
- generating comparison-result data using said calculated hue data;
- performing calculation on said comparison-result data and said calculated hue data;
- performing calculation between said respective hue data;
- and
- performing matrix calculation using said comparison-result data, outputs of said calculation, said calculated hue data, said minimum value α, and based on predetermined matrix coefficients.
Dependencies are inferred from the claim text.