Image analysis – Applications – Document or print quality inspection
Patent
1995-04-10
1997-09-02
Boudreau, Leo
Image analysis
Applications
Document or print quality inspection
356429, 2505594, G06K 900
Patent
active
056640250
ABSTRACT:
The invention relates to an apparatus for the quality control of a print produced by a printing machine. The apparatus includes a CCD camera and a measuring girder, extending substantially across the width of a printing surface to be controlled. A path of light coming from a printing surface to the camera is provided with mirrors arranged in a manner such that the light of said path reflects from the mirrors several times, whereby the distance covered by the light coming from a printing surface to camera is a multiple when compared to the distance between the camera and the printing surface. The mirrors can be used for "packing" the control apparatus into a compact size, and yet it is possible to employ a standard CCD line camera as the measuring head. The apparatus is particularly suitable for the quality control of newspaper printing.
REFERENCES:
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patent: 4567506 (1986-01-01), Shinoda et al.
patent: 4630276 (1986-12-01), Moran
patent: 4667247 (1987-05-01), Karow
patent: 4775238 (1988-10-01), Weber
patent: 5079434 (1992-01-01), Weber
patent: 5125037 (1992-06-01), Lehtonen et al.
patent: 5305392 (1994-04-01), Longest, Jr. et al.
Boudreau Leo
Insinooritoimisto Data Oy
Mehta Bhavesh
LandOfFree
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