Systems and methods for local tone mapping of high dynamic range images
US8766999B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 2010 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Nov 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/16
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This is generally directed to systems and methods for local tone mapping of high dynamic range (“HDR”) images. For example, a HDR image can have its larger dynamic range mapped into the smaller dynamic range of a display device. In some embodiments, to perform the local tone mapping, a RGB to Y converter can be used to convert the input image signal to a luminance signal in the YCgCo color space, a shape adaptive filter can be used to separate the luminance signal into its illumination and reflectance components, contrast compression can be applied to the illumination component, image sharpening can be applied to the reflectance component, and the processed illumination and reflection components can be used to calculate a processed RGB signal. The dynamic range of the processed RGB signal can then be mapped into the dynamic range of the display device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.