Image reading apparatus and dirt detection method
US10848626B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2019 |
| Grant date | Nov 24, 2020 |
| Priority date | — |
| Expiry date | Sep 25, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/00063
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus includes a reading section that receives light input via a transparent member to perform reading, a background section configured to switch a background facing the transparent member either to a first background that is a background of a first color or to a second background that is a background of a second color brighter than the first color, and a control section. The control section compares, with a threshold set in advance, first read data generated by causing the reading section to perform reading of the first background, compares, with the threshold, second read data generated by causing the reading section to perform reading of the second background, and, when the first read data is above the threshold or when the second read data is below the threshold, determines that dirt is present on the transparent member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.