Automatic exposure estimation for HDR images based on image statistics
US8346009B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2010 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jul 19, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for tone mapping high dynamic range images for display on low dynamic range displays wherein high dynamic range images are first accessed. The high dynamic range images are divided the into different regions such that each region is represented by a matrix, where each element of the matrix is a weight or probability of a pixel value. An exposure of each region is determined or calculated by estimating an anchor point in each region such that most pixels in each region are mapped to mid grey and the anchor points are adjusted to a key of the images to preserve overall brightness. The regions are then placed or mapped to zones and exposure values are applied to the regions responsive to the weight or probability. The regions are fused together to obtain a final tone mapped image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.