Method and apparatus for detecting defective printed matter prin

Details Method and apparatus for detecting defective printed matter prin Method and apparatus for detecting defective printed matter prin

1996-06-19

1997-04-29

Mancuso, Joseph

Image analysis

Applications

Document or print quality inspection

348130, G06K 900

Patent

active

056257031

ABSTRACT:
According to a method and apparatus for detecting a defective printed matter in a printing press, each pixel data of a printed matter serving as a reference is stored as reference image data. Each pixel data of a printed matter serving as a test object is input as test image data. Corresponding pixel data of the reference image data and the test image data are compared with each other to detect a defective printed matter. A change in tone is recognized by accumulating and comparing the reference image data and the test image data in units of predetermined areas. The reference image data is automatically updated and stored on the basis of new test image data upon recognition of the change in tone.

REFERENCES:
patent: 4311914 (1982-01-01), Huber
patent: 4561103 (1985-12-01), Horiguchi et al.
patent: 4685139 (1987-08-01), Masuda et al.
patent: 4857747 (1989-08-01), Bolton et al.
patent: 5144566 (1992-09-01), Anderson et al.

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