Method and apparatus for enhancing contrast
US7940997B2 · kind B2 · utility
5Cited by
6References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 23, 2006 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Nov 30, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4318
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of enhancing contrast includes obtaining a first luminance histogram of an input image; generating a second luminance histogram through pixel redistribution for the first luminance histogram; computing a conversion function based on both a first cumulative density function based on the first luminance histogram and a second cumulative density function based on the second luminance histogram; and changing the luminance distribution of the input image based on the conversion function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.