Method and apparatus for processing edges of a gray image
US9299163B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2014 |
| Grant date | Mar 29, 2016 |
| Priority date | — |
| Expiry date | May 29, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20052
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for processing a gray image, including: calculating a mean value and a standard difference of each edge pixel needing processing in an original gray image, and determining a predefined noise variance of each edge pixel according to the mean value and the standard difference; performing two-dimensional discrete cosine transform on an original gray image of a first adjacent area of each edge pixel; performing Wiener filtering on the two-dimensional discrete cosine transformed image data according to the noise variance; performing discrete cosine inverse transform on the two-dimensional Wiener filtered image data to obtain a filtered gray image of the first adjacent area; and extracting a filtered pixel value of each edge pixel from the filtered gray image of the first adjacent area, and obtaining a processed pixel value of each edge pixel by performing weighted summation on the filtered pixel value and an original pixel value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.