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    • 7. 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。
    • 8. 发明授权
    • Method and apparatus for processing a color image
    • 用于处理彩色图像的方法和装置
    • US06172776B2
    • 2001-01-09
    • US08771143
    • 1996-12-20
    • Kazumasa MuraiHitoshi Ogatsu
    • Kazumasa MuraiHitoshi Ogatsu
    • G03F308
    • H04N1/6022
    • Device independent color signals in color coordinates of the calorimetric system are computed using the color signals Ci, Mi, Yi, Ki in first CMYK coordinates. A maximum quantity of black maxKi of the color signals Ci, Mi, Yi, Ki is computed by using the color signals Ci, Mi, Yi, Ki and the device independent color signals. A black ratio g of the color signals Ci, Mi, Yi, Ki is computed using the maximum black quantity maxKi and the color signal Ki. A maximum quantity of black that can be obtained without changing the device independent color signals is computed using the device independent color signals. The color signal Ko in second CMYK coordinates is determined by the maximum black quantity and the black ratio, and the color signals Co, Mo, Yo, Ko in the CMYK coordinates are determined by using the device independent color signals and the color signal Ko.
    • 使用第一CMYK坐标中的颜色信号Ci,Mi,Yi,Ki计算量热系统的颜色坐标中的装置独立颜色信号。 通过使用颜色信号Ci,Mi,Yi,Ki和设备无关的颜色信号来计算颜色信号Ci,Mi,Yi,Ki的最大黑色maxKi的最大量。 使用最大黑量maxKi和颜色信号Ki来计算颜色信号Ci,Mi,Yi,Ki的黑色比率g。 使用与设备无关的颜色信号来计算可以在不改变设备独立颜色信号的情况下获得的最大黑色量。 第二CMYK坐标中的颜色信号Ko由最大黑色和黑色比率确定,并且通过使用与器件无关的颜色信号和颜色信号Ko来确定CMYK坐标中的颜色信号Co,Mo,Yo,Ko。
    • 9. 发明授权
    • Color image formation method and color image formation apparatus
    • 彩色图像形成方法和彩色图像形成装置
    • US6130675A
    • 2000-10-10
    • US5029
    • 1998-01-12
    • Kazumasa MuraiHitoshi Ogatsu
    • Kazumasa MuraiHitoshi Ogatsu
    • B41J2/525G06T1/00H04N1/46H04N1/60G06F15/00
    • H04N1/6016H04N1/6058
    • Input color signals are input at step S11 and are converted into first CMYK color material amounts to minimize a first distance function at step S12. At step S13, color coordinates reproduced from the first CMYK color material amounts are obtained based on a printer model. If the input color signals are determined within a color reproduction range at step S14, the first CMYK color material amounts are output at step S22. If the input color signals are determined outside the color reproduction range, reproduced lightness is compared with input lightness at step S15. If the reproduced lightness is less than the input lightness, lightness weight .alpha. responsive to a yellow saturated color rate is used to generate a second distance function at steps S16-S18. On the other hand, if the reproduced lightness is equal to or greater than the input lightness at step S15, a second distance function having weight as a constant is generated at steps S19 and S20. Second YMCK color material amounts to minimize the second distance function are calculated at step S21 and are output at step S22.
    • 在步骤S11输入输入颜色信号,并将其转换为第一CMYK颜色材料量,以在步骤S12将第一距离功能最小化。 在步骤S13中,基于打印机模型获得从第一CMYK颜色材料量重现的颜色坐标。 如果在步骤S14在颜色再现范围内确定输入颜色信号,则在步骤S22输出第一CMYK色材料量。 如果在颜色再现范围之外确定输入颜色信号,则在步骤S15将再现亮度与输入亮度进行比较。 如果再现亮度小于输入亮度,则在步骤S16-S18,使用响应于黄色饱和色彩速率的亮度权重α来产生第二距离函数。 另一方面,如果在步骤S15中再现的​​亮度等于或大于输入亮度,则在步骤S19和S20中产生具有权重作为常数的第二距离函数。 在步骤S21中计算出使第二距离功能最小化的第二YMCK颜色材料,并在步骤S22输出。