Digital image segmentation using flash
US8174611B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2009 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | Mar 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20036
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital camera function, such as can be implemented in a cellular telephone handset, and that includes automated segmentation of foreground subjects in acquired digital photos and images. Successive images are captured by the digital camera function at different flash exposure levels, for example using existing light only and using flash exposure. After alignment and registration of the images, luminance difference values in the two images are determined for each pixel, and the luminance difference values compared against a threshold value on a pixel-by-pixel basis. Those pixels with luminance difference values exceeding the threshold are segmented from the image as foreground subjects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.