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Proceedings Paper

Two-image photometric stereo method
Author(s): Jun Yang; Noboru Ohnishi; Noboru Sugie
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Paper Abstract

In the photometric stereo method, the surface orientation of an object is determined by using multiple images (at least three images). The multiple images are obtained by changing the position of a light source, and the surface orientation of the object can be determined only in the area of the object illuminated by all light sources. So it is desirable that the number of light sources should be reduced. We propose a method for determining surface orientation along with reflectance, in which only two light sources are used. It is assumed that an object is convex and has a smooth Lambertian surface with locally constant reflectance. We have found the following: there exists a 'separation line' in the image, along which the surface normal is represented as a linear combination of two vectors pointing toward the direction of light sources, and the separation line separates the surface into two regions. Not only when the reflectance is known, but even though the reflectance is unknown, we can determine the surface orientation of the object using the property of the separation line. Here we use the constraint of convexity. Simulations carried out under various situations yielded satisfactory results.

Paper Details

Date Published: 1 November 1992
PDF: 12 pages
Proc. SPIE 1826, Intelligent Robots and Computer Vision XI: Biological, Neural Net, and 3D Methods, (1 November 1992); doi: 10.1117/12.131622
Show Author Affiliations
Jun Yang, Nagoya Univ. (Japan)
Noboru Ohnishi, Nagoya Univ. (Japan)
Noboru Sugie, Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 1826:
Intelligent Robots and Computer Vision XI: Biological, Neural Net, and 3D Methods
David P. Casasent, Editor(s)

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