Special Section on Speckle-Based Metrology

Subjective speckle suppression in laser-based stereo photogrammetry

[+] Author Affiliations
Andreas Walter Stark, Eugene Wong, Daniel Weigel, Holger Babovsky, Thomas Schott, Richard Kowarschik

Friedrich Schiller University Jena, Institute of Applied Optics, Fröbelstieg 1, Jena 07743, Germany

Abbe Center of Photonics, Max-Wien-Platz 1, Jena 07743, Germany

Center of Medical Optics and Photonics, Bachstraße 18, Jena 07740, Germany

Opt. Eng. 55(12), 121713 (Jul 14, 2016). doi:10.1117/1.OE.55.12.121713
History: Received April 29, 2016; Accepted June 23, 2016
Text Size: A A A

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.

Figures in this Article
© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Andreas Walter Stark ; Eugene Wong ; Daniel Weigel ; Holger Babovsky ; Thomas Schott, et al.
"Subjective speckle suppression in laser-based stereo photogrammetry", Opt. Eng. 55(12), 121713 (Jul 14, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.121713


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.