Printing quality examining method

Details Printing quality examining method Printing quality examining method

1998-03-20

2000-06-27

Chang, Jon

Image analysis

Applications

Document or print quality inspection

348 92, 25055905, G06K 978

Patent

active

060816082

ABSTRACT:
A printing quality examining method in which image data printing paper is successively taken in by a camera of a detection unit. The image data are compared with a previously taken-in reference data to detect a printing defect so that a decision as to whether printing quality is good or bad is made. The image data is averaged in time to calculate an estimated data, and the estimated data is compared with the previously taken-in reference data. When the estimated data is normal, pixels are determined to be normal. When the estimated data is unusual, the image data from the detection unit is compared with the reference data at next step so that when the image data from the detection is normal, the pixels are determined to be normal and when the image data is unusual, the pixels are determined to be defective and the paper is discharged.

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patent: 5625703 (1997-04-01), Okuda et al.
4.13.3 Principal of Detection, Y Studio Sunpro, ISBN4-924728-02-0 C3058, 1986-1987, pp. 303-310 (with English language translation of pertinent section).

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