Method for inverse tone mapping of an image
US9911181B2 · kind B2 · utility
4Cited by
7References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 2, 2014 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Dec 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/741
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method comprising, for each pixel, obtaining a pixel expansion exponent value (E′(p)) by low pass filtering luminance values of colors of pixels in its spatial neighborhood, obtaining a pixel luminance-enhancement value (Yenhance(p)) by extraction of high frequencies of luminance values of colors of pixels in its spatial neighborhood, and then inverse tone mapping the luminance (Y(p)) according to the equation Yexp(p)=Y(p)E′(p)×[Yenhance(p)]c.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.