Calibration and registration of camera arrays using a single circular grid optical target
US9210404B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 2012 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Feb 26, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods for determining intrinsic parameters associated with a camera and for registering cameras within a camera array are described. In some embodiments, a camera may be calibrated using an optical target that is positioned at a depth outside the depth of focus of the camera. The optical target may include a grid of symmetrical shapes (e.g., a rectilinear grid of circles or tilted squares). The intrinsic parameters for the camera may be determined using an iterative calibration process in which a cost function is used to evaluate the straightness of lines intersecting rows and columns associated with centroids of the symmetrical shapes. In some embodiments, the registration of a color camera with a depth camera may include mapping centroids identified within a first color image captured by the color camera with corresponding centroids identified within an undistorted intensity image captured by the depth camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.