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Automatic production of a periodic pattern without the occurrence of moire effects
Automatic production of a periodic pattern without the occurrence of moire effects
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机译:自动产生周期性图案而不会出现波纹效应
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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
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