Apparatus and method for local contrast enhanced tone mapping
US8363131B2 · kind B2 · utility
16Cited by
5References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 15, 2009 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Aug 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/134
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and systems for enhancing an image. Respective local contrast values are determined for selected pixels of the image by, for each selected pixel, adjusting a respective luminance value of the pixel by an average luminance value of neighboring pixels to obtain the local contrast value. Respective tone-mapped values are determined for further selected pixels in the image based on a global luminance value representing the image. The local contrast values and the tone-mapped values are combined, respectively, for the corresponding pixels in the image to produce the enhanced image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.