Image correction method, apparatus, article and image
US7421145B2 · kind B2 · utility
0Cited by
8References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Apr 15, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image correction method able to avoid error image. According to opposite properties of black and white, only the last few bits of the scanned digital signal are extracted for black correction, while only the first few bits of the scanned digital signal are extracted for white correction. Further, the most significant bit of the digital signal is 1 for white correction. Therefore, the unwanted LBB effect on the scanned image caused by dust or spot on the correction document is avoided. In addition, as only a few bits of the scanned digital signal are extracted, the requirement in memory capacity is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.