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    • 4. 发明授权
    • Color image processing apparatus for color matching and color matching
processing method
    • 用于颜色匹配和颜色匹配处理方法的彩色图像处理装置
    • US5764795A
    • 1998-06-09
    • US590937
    • 1996-01-24
    • Nobuyuki TakeoHitoshi OgatsuShinji Kita
    • Nobuyuki TakeoHitoshi OgatsuShinji Kita
    • H04N1/60
    • H04N1/6022
    • Three-dimensional LUTs produce a lightness signal L* from input color signals C, M and Y. The three-dimensional LUTs are respectively provided for four divisional sections of an input color signal K. A three-dimensional LUT switching device judges to what section a current value of the input color signal K belongs. A selector selects one of the LUTs in accordance with a judgment result. Similar processing is performed for chromaticity signals a* and b*. According to another aspect of the invention, three-dimensional LUT color converters produce color signals L.sub.2 *, a.sub.2 * and b.sub.2 * based on only input color signals C, M and Y. A position in the L*a*b* space of the color signals L.sub.2 *, a.sub.2 * and b.sub.2 * has a deviation from a position of color signals L.sub.1 *, a.sub.1 * and b.sub.1 * to be output actually. Based on an input color signal K, a one-dimensional LUT produces a lightness signal L.sub.3 *, which corresponds to the deviation. A color signal combining means produces final output color signals L.sub.1 *, a.sub.1 * and b.sub.1 * based on the color signals L.sub.2 *, a.sub.2 * and b.sub.2 * and the lightness signal L.sub.3 *.
    • 三维LUT从输入颜色信号C,M和Y产生亮度信号L *。三维LUT分别被提供给输入彩色信号K的四个分割部分。三维LUT切换装置判断哪个部分 输入颜色信号K的当前值属于。 选择器根据判断结果选择一个LUT。 对色度信号a *和b *进行类似的处理。 根据本发明的另一方面,三维LUT颜色转换器仅基于输入颜色信号C,M和Y产生颜色信号L2 *,a2 *和b2 *。在L * a * b *空间中的位置 颜色信号L2 *,a2 *和b2 *与颜色信号L1 *,a1 *和b1 *的位置实际偏离。 基于输入颜色信号K,一维LUT产生对应于偏差的亮度信号L3 *。 颜色信号组合装置基于颜色信号L2 *,a2 *和b2 *和亮度信号L3 *产生最终输出颜色信号L1 *,a1 *和b1 *。
    • 9. 发明授权
    • Color image processing
    • 彩色图像处理
    • US5636290A
    • 1997-06-03
    • US667883
    • 1996-06-20
    • Shinji KitaHitoshi OgatsuKazumasa Murai
    • Shinji KitaHitoshi OgatsuKazumasa Murai
    • H04N1/60G06T1/00G06T11/00H04N1/46G06K9/00
    • G06T11/001
    • A first nonlinear conversion section converts input color signals of a kind that is one of plural, different kinds to L*a*b* signals. A second nonlinear conversion section converts the L*a*b* signals to image recording signals of four colors including black. The first nonlinear conversion section includes an input judgment device for judging the kind of input color signals, a weight memory for storing weights for the respective kinds of color signals, and a nonlinear conversion circuit. The weights corresponding to the kind of input color signals identified by the input judgment device are read from the weight memory and set in the nonlinear conversion circuit. The first nonlinear conversion section further has a learning device to accommodate color signals whose conversion relationship with the L*a*b* signals has not been defined.
    • 第一非线性转换部分将作为多种不同种类之一的输入颜色信号转换为L * a * b *信号。 第二非线性转换部分将L * a * b *信号转换成包括黑色的四种颜色的图像记录信号。 第一非线性转换部分包括用于判断输入颜色信号的种类的输入判断装置,用于存储各种颜色信号的权重的权重存储器和非线性转换电路。 对应于由输入判断装置识别的输入彩色信号种类的权重从权重存储器中读出并设置在非线性转换电路中。 第一非线性转换部分还具有用于容纳与L * a * b *信号的转换关系未定义的色彩信号的学习装置。