Illuminance flow over anisotropic surfaces
JOSA A, Vol. 25, Issue 2, pp. 282-291 (2008)
http://dx.doi.org/10.1364/JOSAA.25.000282
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Abstract
A theory is presented to analyze images of anisotropic fine-scale surfaces. We investigate the estimates of illuminance flow by using structure tensors. For anisotropic surfaces, both the gradient-based and the Hessian-based tensors will yield deviations from the true illumination orientation. Our theory predicts this deviation. To show the use of this theory, an algorithm is derived that uses both tensors simultaneously to compensate for small amounts of anisotropy. Experimental results with rendered surfaces are shown to conform well to our theory.
© 2008 Optical Society of America
OCIS Codes
(100.2960) Image processing : Image analysis
(150.2950) Machine vision : Illumination
(330.7310) Vision, color, and visual optics : Vision
ToC Category:
Diffraction and Gratings
History
Original Manuscript: April 27, 2007
Revised Manuscript: October 26, 2007
Manuscript Accepted: October 29, 2007
Published: January 7, 2008
Virtual Issues
Vol. 3, Iss. 3 Virtual Journal for Biomedical Optics
Citation
Stefan Karlsson, Sylvia Pont, and Jan Koenderink, "Illuminance flow over anisotropic surfaces," J. Opt. Soc. Am. A 25, 282-291 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-2-282
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