Image analysis – Applications – Document or print quality inspection
Reexamination Certificate
2004-04-07
2009-11-17
Chen, Wenpeng (Department: 2624)
Image analysis
Applications
Document or print quality inspection
C356S435000
Reexamination Certificate
active
07620211
ABSTRACT:
An image analysis method to quantify visual showthrough of printed images on the reverse face of planar objects, such as paper. An illumination level is set using a white reference object. A white reference image is stored in a computer memory. An image of a planar object having a printed image on the reverse face is stored in a computer memory. A pixel by pixel ratio of the two images is calculated and a mean value of the ratios is calculated to characterize the visual showthrough. The measurements are substantially independent of both the illumination level and image shading.
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Browne Richard Walker
Canning, Jr. Robert V.
Evans Michael H.
Johnson Robert William
Rubin Barry
Chen Wenpeng
E.I. du Pont de Nemours and Company
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