Calculating noise estimates of a digital image using gradient analysis
US7092579B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2002 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Sep 25, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/73
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of estimating the noise in a digital image for use in subsequent image processing, includes receiving a source digital image having a plurality of pixels; selecting a pixel of interest; providing a plurality of orientations for the pixel of interest; using gradient analysis on the source digital image and the plurality of orientations to select the most suitable orientation for estimating noise for the pixel of interest; using the selected orientation in the pixel of interest to determine a noise-free pixel estimate for the pixel of interest; and repeating for other pixels of interest and using the noise-free pixel estimates to calculate a noise characteristic value representing the noise estimate for the source digital image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.