Method and apparatus for adjusting the contrast of an image
US7602447B2 · kind B2 · utility
15Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2006 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Apr 6, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for adjusting the contrast of an input image is disclosed. Brightness level data of the input image is filtered to obtain at least a low frequency component and a high frequency component. The high frequency component is amplified. The input image and the amplified high frequency component are summed to produce brightness level data of the output image. The filtering is carried out by at least one recursive infinite impulse response filter having a single delay coefficient that is adaptive to areas of high contrast in the input image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.