Method for measuring engraving cups
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United States of America Patent
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Feb 25, 2003
Grant Date -
Aug 23, 2001
app pub date -
Dec 14, 2000
filing date -
Dec 17, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
In a method for measuring cups given the engraving of printing cylinders in an electronic engraving machine, an engraver of an engraving member engraves cups into a printing cylinder. The geometric dimensions of the cups represent actual hue values. A video image of the cups is picked up. The contour of a cup is determined in the video image and the geometric dimensions of the cup are determined in that the cup contour is measured. For this purpose, the cup contour in the picked up video image is smoothed by a simulation with a spline function or a general polynomial function, and the geometric dimensions of the cup are determined on the basis of the smoothed cup contour. The determined geometric dimensions are the transverse diagonal, the longitudinal diagonal, the through-cut, the web width, the cup surface or the cup volume.
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