Method and apparatus for detecting disparity of cyclic length of

Details Method and apparatus for detecting disparity of cyclic length of Method and apparatus for detecting disparity of cyclic length of

1991-02-22

1991-10-22

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 22, 382 57, 358106, G06K 900

Patent

active

050602810

ABSTRACT:
A method of detecting a disparity in a cyclic length of a printed pattern includes the steps of scanning a to-be-checked sheet on which predetermined patterns are cyclically printed in the longitudinal direction by an electronic camera to obtain image data corresponding to a pattern, extracting outline data representing an outline of the pattern from the image data, writing the outline data extracted in the extraction step into a memory with a predetermined cycle in accordance with travel position data of the to-be-checked sheet, reading out the outline data, and comparing first outline data for one cycle read out from the memory and second outline data which is read out after the first outline data is read out. Disparity of a cyclic length of the pattern is detected based on a correlation between the first and second outline data, e.g., a coincidence or noncoincidence therebetween, in accordance with the comparison result in the comparison step.

REFERENCES:
patent: 4136332 (1979-01-01), Kadota et al.
patent: 4349880 (1982-09-01), Southgate et al.
patent: 4561103 (1985-12-01), Horiguchi et al.
patent: 4626907 (1986-12-01), Schedewie
patent: 4701859 (1987-10-01), Matsuyama et al.
patent: 4724481 (1988-02-01), Nishioka
patent: 4805224 (1989-02-01), Koezuka et al.
patent: 4835720 (1989-05-01), Ditto et al.
Thomas, "Defect Scanner for Repetitive Patterns", Mar., 1974, vol. 16, No. 10, p. 3158, IBM Technical Disclosure Bulletin.

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