Image reading device and noise detecting method
US7660018B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 2006 |
| Grant date | Feb 9, 2010 |
| Priority date | — |
| Expiry date | Apr 30, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30168
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading device compares pixel values of an image data, which is output when a document is not at a reading position, with a threshold and generates a first dust detection data; compares a image data, which is output while the document is passing the reading position, with a threshold and generates a second dust detection data; when dust is indicated as being present at a matching position in a main scanning direction in both the first dust detection data and the second dust detection data, generates a third dust detection data; and judges that noise is present when the third dust detection data indicates that dust is continuously present for at least a prescribed length in a sub scanning line direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.