Method and system for contrast enhancement of digital video
US7424148B2 · kind B2 · utility
27Cited by
14References
23Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 28, 2004 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Jan 26, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10016
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for enhancing the contrast of video pictures that includes the steps of receiving an input video signal; extracting a picture from said input video signal; determining an active window for said picture; calculating a histogram for luminance values of pixels in said active window of said picture; determining characteristics of said histogram; selecting one suitable mapping function from a plurality of mapping functions based on the determined characteristics of said histogram; and mapping the luminance value of each pixel in said picture in accordance with said selected mapping function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.