Method and apparatus for noise reduction using discrete wavelet transform
US7260272B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2003 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Feb 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20064
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved noise reduction process by wavelet thresholding utilizes a discrete wavelet transform to decompose the image into different resolution levels. A thresholding function is then applied in different resolution levels with different threshold values to eliminate insignificant wavelet coefficients which mainly correspond to the noise in the original image. Finally, an inverse discrete wavelet transform is applied to generate the noise-reduced video image. The threshold values are based on the relationships between the noise standard deviations of different decomposition levels in the wavelet domain and the noise standard deviation of the original image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.