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Proceedings Paper

Depth from Defocus of Structured Light
Author(s): Bernd Girod; Stephen Scherock
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Paper Abstract

We propose a new range sensing technique that uses defocus of structured light to measure depth. The technique is an extension of the original passive depth-from-defocus idea to an active, structured-light system. Depth from defocus of structured light has similar properties as structured light triangulation, but it avoids the "missing parts problem" and the "correspondence problem" by eliminating the parallax between the structured light source and the camera. We propose refinements to the technique, using either an anisotropic aperture or astigmatic optics for the light source. Both refinements use an isotropic structured light pattern and compare blur in two orthogonal directions. We point out different ways to remove the ambiguity between objects behind and in front of the plane of best focus.

Paper Details

Date Published: 1 April 1990
PDF: 7 pages
Proc. SPIE 1194, Optics, Illumination, and Image Sensing for Machine Vision IV, (1 April 1990); doi: 10.1117/12.969853
Show Author Affiliations
Bernd Girod, MIT Media Laboratory (United States)
Stephen Scherock, MIT Media Laboratory (United States)

Published in SPIE Proceedings Vol. 1194:
Optics, Illumination, and Image Sensing for Machine Vision IV
Donald J. Svetkoff, Editor(s)

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