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Automatic production of a periodic pattern without the occurrence of moire effects

机译:自动产生周期性图案而不会出现波纹效应

摘要

In a device for generating a digital grey scale raster which comprises a multiplicity of periodic patterns, a configuration determining unit (53), using period constants (51), determines a grid (27) which displays the configuration of one of the periodic patterns in the digital grey scale raster. The period constants (51) and a function (50) which specifies a procedure for obtaining threshold values in a square area are supplied to a threshold value distribution unit (54) which rotates the threshold values formed by means of the function (50) by a raster angle. On the grid (27), the threshold distribution unit (54) expands threshold values which are magnified at a magnification ratio. When the threshold values on the grid (27) exhibit incoherent numbers, the threshold value distribution unit (54) rearranges the threshold values so that they exhibit coherent numbers. The threshold value distribution unit generates a period pattern signal (52) which indicates the threshold values with the coherent numbers. IMAGE
机译:在用于生成包括多个周期性图案的数字灰度光栅的设备中,配置确定单元(53)使用周期常数(51),确定网格(27),该网格显示周期性图案之一的配置。数字灰度光栅。周期常数(51)和指定用于获得正方形区域中的阈值的过程的函数(50)被提供给阈值分布单元(54),该阈值分布单元(54)使通过函数(50)形成的阈值旋转光栅角度。阈值分配单元(54)在网格(27)上扩大以放大率放大的阈值。当网格(27)上的阈值表现出不连贯数时,阈值分配单元(54)重新排列阈值,使得它们表现出连贯数。阈值分配单元产生周期模式信号(52),该周期模式信号指示具有相干数的阈值。 <图像>

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