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    • 5. 发明申请
    • Apparatus for and method of forming multicolor halftone images
    • 用于形成多色半色调图像的装置和方法
    • US20070159656A1
    • 2007-07-12
    • US10587976
    • 2005-03-15
    • Yasuhiko Kishimoto
    • Yasuhiko Kishimoto
    • G06K15/00
    • H04N1/52B41C1/00B41N1/00
    • A multicolor halftone image apparatus of the present invention includes halftone plates of a plurality of colors for reproducing a colored image, and each halftone is tilted with a relative screen angular difference of 30 degrees or 45 degrees in relation to at least one of the remaining halftones. For the preparation of the multicolor halftone, on the basis of a predetermined screen angle of a specific halftone, halftone dots are disposed in the specific halftone at a predetermined pitch. For each of the remaining halftones, a right triangle is defined such that its vertical angle is equal to a screen angel difference of 30 degrees or 45 degrees which the halftone has in relation to another halftone, and its two sides forming the vertical angle corresponds to screen angle directions of the two halftones. The ratio of the three sides of the right triangle represented by numerical values including √3 or √2, which is an irrational number, is represented by integral values which approximate values obtained by multiplying the numerical values by an integer. On the basis of the right triangle having a ratio approximated by the integral values, respective halftone dots of the two halftones are disposed at a pitch equal to the predetermined pitch along the screen angle directions of the two halftones corresponding to the two sides forming the vertical angle.
    • 本发明的多色半色调图像设备包括用于再现彩色图像的多种颜色的半色调板,并且每个半色调相对于剩余的半色调中的至少一个相对于30度或45度的相对屏幕角度差倾斜 。 为了制备多色半色调,基于特定半色调的预定屏幕角度,将半色调点以预定间距设置在特定半色调中。 对于每个剩余的半色调,定义一个直角三角形,使其垂直角度等于30度或45度的屏幕天使差,这是半色调相对于另一个半色调而形成的垂直角对应于 两个半色调的屏幕角度方向。 由包括√3或√2的数值(由无理数)表示的直角三角形的三边形的比例由通过将数值乘以整数而获得的近似值的积分值表示。 基于具有由积分值近似的比例的直角三角形,两个半色调的相应半色调点以等于预定间距的间距沿着两个形成垂直方向的两个半色调的屏幕角度方向布置 角度。