Camera calibration using off-axis illumination and vignetting effects
US7023472B1 · kind B1 · utility
25Cited by
25References
40Claims
0Family size
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Key dates
| Filing date | Apr 23, 1999 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Apr 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/80
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An imaging device is calibrated using a flat, featureless surface and uniform illumination, relying on the effect of off-axis illumination and vignetting on the reduction of light into the camera at off-axis angles. The effect of the tilt of the camera is also considered. These effects are used to extract intrinsic camera parameters including focal length, principal point, aspect ratio and skew.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.