Heidelberger Druckmaschinen Ag

Kurt Ruegg

Hans Ott

The scanning device comprises a measuring table (T) to which measured object B can be fixed for measurement, measurement carriage (W) with a photoelectric scanning device (100) which can be linearly moved over the surface of the measuring table by means of a drive unit (A), a control unit (S) for the measuring carriage (W), the scanning device (100) and the drive unit (A), and a processing unit (C) for processing and analyzing the measuring signals generated by scanning device (100) from scanned pixels (8) of measured object (B). Scanning device (100) in turn comprises a plurality of measuring heads (120) for pixel-by-pixel measurement of a corresponding plurality of pixels (8) of measured object (B) lying in a row one behind the other and along a corresponding plurality of scanning tracks (5a, 5b) which are parallel to motion direction (X) of measuring carriage (W) such that measured object (B) is sequentially scanned, pixel by pixel, in a grid-like scanning pattern.

Scanning device for pixel-by-pixel photoelectric measurement of a

Method and apparatus for the determination of the color value gradients of a picture element of a printed image when there are changes in the layer thicknesses of the inks used in the printing, the picture element (4) is photo-electrically scanned in the visible range of the spectrum and also in the near infrared range. From the scanning signals thereby obtained, color coordinates or an approximated subjectively equidistant color system and at least one infrared value is formed. The color value gradients are then calculated from these color coordinates and the at least one infrared value.

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Effretikon, Switzerland

Kurt Ruegg