Histogram adjustment for high dynamic range image mapping
US7639893B2 · kind B2 · utility
36Cited by
7References
21Claims
0Family size
Assignee
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Key dates
| Filing date | May 17, 2006 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Mar 2, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of automatic mapping of image data includes representing image data for an image as luminance values, determining a key value as a function of an average luminance value of the image and of minimum and maximum luminance values of the image, generating offset-adjusted luminance values including applying an offset to each of the luminance values, the offset being a function of the determined key value, and computing a tone reproduction curve for at least a region of the image which includes applying a mapping function to the offset-adjusted luminance values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.