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首页> 外文会议>SPIE Conference on Color Imaging : Displaying, Processing, Hardcopy, and Applications >Halftone Moire Due to Imager Distortion
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Halftone Moire Due to Imager Distortion

机译：由于成像仪失真，半色调莫尔

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Individual halftone color separations must possess a low degree of distortion to avoid undesirable moire in the overlays that produce the process colors. Achieving low relative distortion requires precise registration between the exposure devices used to write the halftone separations. However, optical and mechanical errors within the multiple Raster Output Scanners (ROS's) or image bars of a printer result in differences in the trajectory and placement of the exposure spots among color planes. In this paper, color halftone moire due to ROS errors is analyzed using a frequency vector representation of color halftones. We analyze three forms of process-direction distortion: skew, shear, and bow. Each distortion is inspired from a practical printing system (i.e. while shear and bow are observed in ROS systems, skew is observed in image bar imaging systems). The frequency vector formalism is used to derive bounds on distortion for a classical halftone screen configuration (square cell equal frequency halftones at 15°, 45°, and 75°). The bounds are examined for distortion of one halftone screen and the analysis can be readily applied to distortion of multiple screens. The bounds can be used to develop specifications for imaging components in the design of a ROS or image bar imaging system.
机译：单个半色调颜色分离必须具有低程度的变形，以避免产生工艺颜色的覆盖层中的不良莫尔。实现低的相对失真需要用来写入半色调分色曝光装置之间的精确配准。然而，多个光栅输出扫描仪（ROS）内的光学和机械误差或打印机的图像栏会导致颜色平面中曝光斑点的轨迹和放置的差异。在本文中，使用ROS误差引起的颜色半色调莫尔莫尔经使用彩色半色调的频率矢量表示分析。我们分析了三种形式的过程方向失真：歪斜，剪切和弓。每个失真从实际印刷系统的启发（即在ROS系统中观察到剪切和弓，在图像杆成像系统中观察到偏斜）。频率矢量形式主义用于导出常规半色调屏幕配置的失真上的界限（平方电池等频率在15°，45°和75°）。边界被检查为一个半色调网屏的失真和分析可以容易地应用到多个屏幕的失真。界限可用于开发用于在ROS或图像栏成像系统的设计中进行成像组件的规范。

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