Method and apparatus for filtering noise from a digital image
US7031548B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2001 |
| Grant date | Apr 18, 2006 |
| Priority date | — |
| Expiry date | Oct 21, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
As is known in the art, it becomes progressively difficult to identify an image region as being caused by noise as the area of that image region increases. The present invention encompasses the discovery that image data associated with smaller noise regions tends to mirror image data associated with larger noise regions. In accordance with the present invention, known techniques are used to accurately identify smaller noise regions. The image data extracted from these smaller noise regions is then used to aid in the identification of larger noise regions. Accordingly, the present invention increases the area of noise regions capable of being accurately identified compared to prior art noise identification techniques. Once large and small noise regions have been identified, the noise regions can be filtered using techniques known in the art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.