| 摘要 |
A method for process control during printing includes recording a digital image of a substrate detail and determining a frequency distribution of the gray values of the image points from this image. A minimum of the frequency is defined as the limiting value of the gray value from this frequency distribution in its central range of the gray value. To calculate the half-tone value R of the substrate, those image points which lie on one side of this limiting value are counted as covered and those image points which lie on the other side are counted as free.
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