Image processing system for inspection of overprinted matter

Details Image processing system for inspection of overprinted matter Image processing system for inspection of overprinted matter

1994-03-22

1995-08-08

Couso, Jose L.

Image analysis

Applications

Document or print quality inspection

382309, 356394, 348 86, G06K 900

Patent

active

054406501

ABSTRACT:
An image processing system for inspection of an over-printed matter having at least first and second layers different in lightness under appropriate illumination, wherein a digital image of the surface of the overprinted matter is formed, first and second reference images representing each normal image of the first and second layers are memorized, a first deviation between a first boundary of the first reference image to the second reference image and a portion of the digital image corresponding with the first boundary is measured, a second deviation between a second boundary of the second reference image to the first reference image and a portion of the digital image corresponding with the second boundary is measured, the first reference image is corrected to a first corrected reference image in such a manner as to eliminate the measured first deviation, the second reference image is corrected to a second corrected reference image in such a manner as to eliminate the measured second deviation, a finally corrected reference image is produced on a basis of logical sum of the first and second corrected reference images, and a matching process of the finally corrected reference image and the digital image is carried out for discrimination of the quality of the surface of the overprinted matter.

REFERENCES:
patent: 4778745 (1988-10-01), Leung
patent: 4845558 (1989-07-01), Tsai et al.

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