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Calibrating a non-isotropic near point light source using a plane
Cited 12 time in
Web of Science
Cited 28 time in Scopus
- Authors
- Issue Date
- 2014
- Publisher
- IEEE
- Citation
- Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition, pp.2267-2274
- Abstract
- We show that a non-isotropic near point light source rigidly attached to a camera can be calibrated using multiple images of a weakly textured planar scene. We prove that if the radiant intensity distribution (RID) of a light source is radially symmetric with respect to its dominant direction, then the shading observed on a Lambertian scene plane is bilaterally symmetric with respect to a 2D line on the plane. The symmetry axis detected in an image provides a linear constraint for estimating the dominant light axis. The light position and RID parameters can then be estimated using a linear method. Specular highlights if available can also be used for light position estimation. We also extend our method to handle non-Lambertian reflectances which we model using a biquadratic BRDF. We have evaluated our method on synthetic data quantitavely. Our experiments on real scenes show that our method works well in practice and enables light calibration without the need of a specialized hardware.
- ISSN
- 1063-6919
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