Depth from Defocus of Structured Light

Bernd Girod; Stephen Scherock

doi:10.1117/12.969853

1 April 1990 Depth from Defocus of Structured Light

Bernd Girod, Stephen Scherock

Proceedings Volume 1194, Optics, Illumination, and Image Sensing for Machine Vision IV; (1990) https://doi.org/10.1117/12.969853
Event: 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, 1989, Philadelphia, PA, United States

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.

Citation Download Citation

Bernd Girod and Stephen Scherock "Depth from Defocus of Structured Light", Proc. SPIE 1194, Optics, Illumination, and Image Sensing for Machine Vision IV, (1 April 1990); https://doi.org/10.1117/12.969853

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