Image reading apparatus with shading correction
US10447890B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2017 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Sep 7, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is an image reading apparatus for suppressing an image defect ascribable to shading correction using a white reference plate arranged at a position different from a reading position of an original. The image reading apparatus includes a reading unit configured to read an image from the original passing through the reading position, the white reference plate arranged such that a distance between the reading unit and the white reference plate is larger than the distance between the reading unit and the reading position, and a control system. The control system includes a memory for backup configured to store in advance correlation data representing a correlation between a reading result of the white reference plate obtained by the reading unit, and a reading result of a reference member having a uniform density and arranged at the reading position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.