Color adjusting device including matrix-masking circuitry
AssigneeFuji Xerox Co., Ltd.
InventorsToshiyuki Tsuzuki, Masato Toho
Life of this patent
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Abstract
Color adjustment factors are set according to the color separation signals of an original picture and factors for each separation signal set equal to the absolute value of the sum of the factors corresponding to the other separation signals but of opposite polarity adjustment factors. The color separation signals and the color adjustment data are added to the output densities which are provided before color adjustment so that the color adjustment can be achieved.
Claims5
A color adjusting device, for adjusting the colors in an original picture, said colors of said original picture being separated to obtain input color separation signals, said device comprising:
- matrix masking circuit means for performing matrix masking on said input color separation signals to obtain non-color-adjusted output density signals of said colors of said original picture;
- decision output circuit means for performing an addition operation on said input color separation signals and for performing a subtraction operation on said color separation signals to output a plurality of color decisions representing the presence of regions of color in said original picture;
- color adjusting factor circuit means for outputting, for each of said colors, a first adjustment to increase the density of a predetermined color and a second adjustment to decrease the density of a predetermined color, respectively;
- a color adjusting masking circuit means, for performing a mathematical calculation in response to signals from said color adjusting factor circuit means and said decision output circuit means to obtain a color adjustment change for each of said colors;
- and
- adder circuit means for adding the outputs of said matrix masking circuit to the outputs of said color adjusting masking circuit means to provide output density signals of said colors of a color-adjusted picture.
A method of color adjustment comprising the steps of:
- (a) subjecting color separation signals of an original picture to matrix masking by setting color adjustment factors of the color separation signals equal to the absolute value of the sum of the color adjustment factors corresponding to the other color separation signals but of opposite polarity;
- and
- (b) computing color adjustments through use of a mathematical formula utilizing color data of the original picture and preset color adjustment factors.
Dependencies are inferred from the claim text.