Inverse tone mapping for bit-depth scalable image coding adapted to variable block sizes
US7983496B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2008 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | May 20, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method performs inverse tone mapping of an image in a decoder. For each block of each color channel of the image a scaling factor is determined by adding a predicted scaling factor for the current block to a difference between the predicted scaling factor and the scaling factor of an adjacent block. An offset value for the current block is determined by adding a predicted offset for the current block to a difference between the predicted offset value and the offset value of the adjacent block. The scaling factor and the offset value are applied to pixel intensity values of the current block to produce a mapped block. The inverse tone mapping can also be applied to blocks of different sizes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.