Inspecting device for print

Details Inspecting device for print Inspecting device for print

1985-03-15

1987-08-04

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

250562, 250572, 356430, 382 34, G06H 900

Patent

active

046851399

ABSTRACT:
The present invention relates to an inspecting device for a print which can scan the entire print pattern of a printed sheet by an optical detecting device, detects the image information of the print pattern at every pixel, calculates the difference between the detected image information with reference information, delays the differential signal in several pixels in the scanning direction of the optical detecting device, calculates the difference between the differential signal and the delayed differential signal, sets a threshold level to the twice differential signal produced from the result, and judges the production of a printing defect when the twice differential signal exceeds the threshold level, thereby accurately detecting the printing defect even when the entire variation in the color density occurs on the printed sheet.

REFERENCES:
patent: 3883737 (1975-05-01), Throssell et al.
patent: 4349880 (1982-09-01), Southgate et al.
patent: 4376951 (1983-03-01), Miyazawa
patent: 4488808 (1984-12-01), Kato
patent: 4561103 (1985-12-01), Horiguchi et al.
patent: 4567506 (1986-01-01), Shinoda et al.
Printing Quality Monitoring System for Offset Presses, (Mitsubishi Heavy Industries, Ltd.), undated brochure.

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