Method and apparatus for image denoising with three-dimensional block-matching
US9123103B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2013 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Mar 25, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20182
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for denoising images by block-matching three-dimensional (BM3D) method is disclosed in the present invention. Embodiments of the present invention are used to improve the quality of captured images. Instead of using the same noise variance to denoise all patches of an image, each patch is processed based on a particular assessed noise variance. The assessed noise variance of one reference patch is determined based on noise variance associated with the patch set or based on content characteristics associated with the patch set. The patch set is obtained by block-matching to find similar patches of the reference patch. Noise reduction in frequency domain is applied to the patch set according to the assessed noise variance of the reference patch. The determining of the assessed noise variance can be performed in spatial domain or in frequency domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.