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Optical Engineering

Subjective speckle suppression in laser-based stereo photogrammetry
Author(s): Andreas W. Stark; Eugene Wong; Daniel Weigel; Holger Babovsky; Thomas Schott; Richard Kowarschik
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Paper Abstract

The use of objective speckles as patterns is of high interest for the ongoing development of stereo photogrammetry. The depth of focus of the projected speckle patterns, which can be found to be several meters, can hardly be matched by other projection principles. On the downside, the use of coherent light leads to subjective speckles generated by the rough surface of the object under test. This effect decreases the accuracy under which objects can be reconstructed. We show how laser-based stereo photogrammetry can be adjusted to increase the measurement accuracy of three-dimensional (3-D)-surface measurements while preserving the advantages of speckles projection. Therefore, we present a method to decrease the contrast of subjective speckles in the images by pixel-wise shifting the cameras orthogonally to their viewing direction and back shifting the taken images numerically, accordingly. This leads to an increase in 3-D-reconstruction quality, as seen in a decrease in standard deviation, peak-to-valley value and in an increase in the number of reconstructed points for measured test objects.

Paper Details

Date Published: 14 July 2016
PDF: 7 pages
Opt. Eng. 55(12) 121713 doi: 10.1117/1.OE.55.12.121713
Published in: Optical Engineering Volume 55, Issue 12
Show Author Affiliations
Andreas W. Stark, Friedrich-Schiller-Univ. Jena (Germany)
Abbe Ctr. of Photonics (Germany)
Ctr. of Medical Optics and Photonics (Germany)
Eugene Wong, Friedrich-Schiller-Univ. Jena (Germany)
Abbe Ctr. of Photonics (Germany)
Ctr. of Medical Optics and Photonics (Germany)
Daniel Weigel, Friedrich-Schiller-Univ. Jena (Germany)
Abbe Ctr. of Photonics (Germany)
Ctr. of Medical Optics and Photonics (Germany)
Holger Babovsky, Friedrich-Schiller-Univ. Jena (Germany)
Abbe Ctr. of Photonics (Germany)
Ctr. of Medical Optics and Photonics (Germany)
Thomas Schott, Friedrich-Schiller-Univ. Jena (Germany)
Abbe Ctr. of Photonics (Germany)
Ctr. of Medical Optics and Photonics (Germany)
Richard Kowarschik, Friedrich-Schiller-Univ. Jena (Germany)
Abbe Ctr. of Photonics (Germany)
Ctr. of Medical Optics and Photonics (Germany)


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