1 February 2008 Novel multiresolution approach for an adaptive structured light system
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Optical Engineering, 47(2), 023601 (2008). doi:10.1117/1.2857404
Abstract
3-D triangulation measurement systems with a fixed geometrical configuration have practical limitations that make them inappropriate for a wide variety of applications. The reason is that the ratio between the depth recovery error and the lateral extension is a constant that depends on the geometrical setup. Therefore, with a fixed triangulation setup, there is a tradeoff between field of view and depth resolution. As a consequence, measuring large areas with low depth recovery error necessitates the use of multiresolution techniques. In this work, we propose a multiresolution technique based on a camera-projector system previously calibrated and a second auxiliary camera that can move freely. The method consists of making first a measurement with a large field of view (coarse measurement). Afterwards, the geometrical configuration of the 3-D rig is changed to acquire a small field of view (fine measurement) that is referred to the original reference system and calibration parameters by means of the auxiliary camera. Using this method, a multiresolution reconstruction is possible without any optimization, registration, or recalibration process. Experimental results, which show a decrease of approximately one order of magnitude in the depth recovery error between fine and coarse measures, demonstrate the feasibility of the proposed method.
Javier Vargas, Juan Antonio Quiroga, "Novel multiresolution approach for an adaptive structured light system," Optical Engineering 47(2), 023601 (1 February 2008). http://dx.doi.org/10.1117/1.2857404
JOURNAL ARTICLE
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KEYWORDS
Cameras

Projection systems

Phase measurement

Calibration

Imaging systems

Structured light

3D metrology

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