Representing and reconstructing high dynamic range images
US7747098B2 · kind B2 · utility
33Cited by
14References
19Claims
0Family size
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Key dates
| Filing date | Dec 18, 2006 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Apr 20, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/48
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high dynamic range image can be recovered from a full-resolution lower-dynamic-range image and a reduced-resolution higher-dynamic-range image. Information regarding higher spatial frequencies may be obtained by extracting high spatial frequencies from the lower-dynamic-range image. In some embodiments an approximate impulse-response function is determined by comparing the higher- and lower-dynamic range images. A scaling image obtained by applying the impulse-response function to a high-frequency band of the lower-dynamic range image is combined with an upsampled higher-dynamic range image to yield a reconstructed image.
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