Online calibration of cameras
US9866820B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2014 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Dec 7, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/239
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electronic device can have two or more pairs of cameras capable of performing three-dimensional imaging. In order to provide accurate disparity information, these cameras should be sufficiently calibrated. Automatic calibration can be performed by periodically capturing images with a pair of front-facing cameras and locating matching facial or other feature points in corresponding images captured by those cameras. Correspondences can be detected between feature points and the corresponding feature points can be normalized and outlier feature points can be rejected. A transformation matrix can be determined using at least a portion of remaining feature points and can be used to determine rotation and translation parameters to correct for misalignment between the cameras. The calibration parameters can be refined or otherwise adjusted, and can be used or stored for use in correcting images subsequently captured by those cameras.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.