Printing quality examining method
US6081608A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Mar 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30144
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.