Encoding, decoding, and representing high dynamic range images
US10511837B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2019 |
| Grant date | Dec 17, 2019 |
| Priority date | — |
| Expiry date | Mar 25, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that would not be recoverable from the TM image with a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.