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    • 29. 发明申请
    • IMAGE FORMING APPARATUS AND ITS CONTROL METHOD
    • 图像形成装置及其控制方法
    • US20100220342A1
    • 2010-09-02
    • US12716125
    • 2010-03-02
    • Tsutomu TakataHiroki KitamuraYoshiyuki AkibaShuichi NakamuraYusuke YamamotoMasanao MotoyamaTakeshi AkiyamaKenzo TojimaTakaaki Nagaoka
    • Tsutomu TakataHiroki KitamuraYoshiyuki AkibaShuichi NakamuraYusuke YamamotoMasanao MotoyamaTakeshi AkiyamaKenzo TojimaTakaaki Nagaoka
    • G06F15/00
    • G06K15/1878G06K15/14G06K15/188G06K15/1881H04N1/29H04N1/40062H04N1/4092H04N1/506H04N1/52H04N1/58H04N1/60H04N1/6027H04N1/6072
    • With this invention, color shifting correction is performed first based on shifting amount information indicating a shifting amount with respect to the scanning direction on an image carrier of each image forming unit, and halftone processing is then performed, thus suppressing generation of moiré due to the color shifting correction, and forming a high-quality image. To this end, an image forming engine has color shifting amount storage units C, M, Y, and K (black) which store actual shifting amounts with respect to ideal scan directions on image carriers C, M, Y, and K in image forming units C, M, Y, and K. Color shifting correction amount arithmetic units C, M, Y, and K calculate color shifting correction amounts for respective color components on the basis of the stored color shifting amounts. Color shifting correction units C, M, Y, and K perform color shifting correction by converting coordinates upon reading out image data from bitmap memories C, M, Y, and K on the basis of the calculated color shifting correction amounts, and then perform tone correction. Data after tone correction undergo halftone processing by halftone processors. C, M, Y, and K. PWM processors C, M, Y, and K generate PWM signals for scanning, and output them to exposure units C, M, Y, and K of the respective image forming units.
    • 利用本发明,首先基于在每个图像形成单元的图像载体上指示相对于扫描方向的移动量的移动量信息执行颜色偏移校正,然后执行半色调处理,从而抑制由于 颜色偏移校正,并形成高质量的图像。 为此,图像形成引擎具有在图像形成中存储图像载体C,M,Y和K上的理想扫描方向的实际移动量的色移量存储单元C,M,Y和K(黑色) 单位C,M,Y和K.颜色偏移校正量运算单元C,M,Y和K基于存储的颜色偏移量计算各个颜色分量的颜色偏移校正量。 颜色偏移校正单元C,M,Y和K基于计算出的色移校正量从位图存储器C,M,Y和K读出图像数据,通过转换坐标进行色移校正,然后执行色调 更正。 色调校正后的数据通过半色调处理器​​进行半色调处理。 C,M,Y和K. PWM处理器C,M,Y和K产生用于扫描的PWM信号,并将其输出到各个图像形成单元的曝光单元C,M,Y和K.