Apparatus and methods for encoding, decoding and representing high dynamic range images
US8514934B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2007 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Jan 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/184
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data structure defining a high dynamic range image comprises a tone map having a reduced dynamic range and HDR information. The high dynamic range image can be reconstructed from the tone map and the HDR information. The data structure can be backwards compatible with legacy hardware or software viewers. The data structure may comprise a JFIF file having the tone map encoded as a JPEG image with the HDR information in an application extension or comment field of the JFIF file, or a MPEG file having the tone map encoded as a MPEG image with the HDR information in a video or audio channel of the MPEG file. Apparatus and methods for encoding or decoding the data structure may apply pre- or post correction to compensate for lossy encoding of the high dynamic range information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.