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Image forming apparatus that ensures highly accurate color conversion to input image with gradation, and recording medium therefor

專利號
US10097735B2
公開日期
2018-10-09
申請人
Kyocera Document Solutions Inc.（JP Osaka）
發(fā)明人
Etsuko Manda
IPC分類
H04N1/60; H04N1/64
技術領域
voronoi,radius,empty,circle,generatrix,mfp,cmyk,step,image,circles
地域： Osaka

摘要

An image forming apparatus includes a table generating unit. The table generating unit, in a Voronoi diagram, obtains empty circles as circles centered at Voronoi seeds of ends of Voronoi sides that intersect with a straight line passing through a largest saturation color and a smallest-saturation and specific-lightness color and passes through generatrices. After the table generating unit sets one of the generatrices shared by the two adjacent empty circles whose radius ratio is outside a specific range as a target point, and causes the radius ratio of the two empty circles to be within the specific range by changing at least one radius of the two empty circles, the table generating unit generates the conversion table that sets a color that corresponds to an intersection point corresponding to the target point among the intersection points of the two empty circles, as the definition colors.

說明書

As illustrated in FIGS. 5 and 6, when determining that all the adjacent-empty-circle-radius ratios are within the radius-ratio acceptable range at Step S139, the table generating unit 18c converts the Lab values of all the generatrices 41 on the Voronoi diagram 40 into the RGB values by interpolation calculation using the RGB-to-Lab-to-CMYK table 17b (Step S145).

Subsequently, the table generating unit 18c converts the Lab values of all the generatrices 41 on the Voronoi diagram 40 into the CMYK values by interpolation calculation using the RGB-to-Lab-to-CMYK table 17b (Step S146).

Subsequently, the table generating unit 18c associates the RGB values generated at Step S145 and the CMYK values generated at Step S146 with each of the generatrices 41 to generate the RGB-to-CMYK table 17c (Step S147).

Subsequently, the color conversion unit 18b converts the input image into the output image using the RGB-to-CMYK table 17c generated at Step S147 (Step S148).

Subsequently, the control unit 18 executes printing with the printer 14 based on the output image generated at Step S148 (Step S149), and terminates the operations illustrated in FIGS. 5 and 6.

Next, a description will be given of operations of the MFP 10 when execution of printing based on an input image other than the input image with gradation is instructed.

權利要求

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