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Proceedings Paper

Method for measuring stereo camera depth accuracy based on stereoscopic vision
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Paper Abstract

We present a method to evaluate stereo camera depth accuracy in human centered applications. It enables the comparison between stereo camera depth resolution and human depth resolution. Our method uses a multilevel test target which can be easily assembled and used in various studies. Binocular disparity enables humans to perceive relative depths accurately, making a multilevel test target applicable for evaluating the stereo camera depth accuracy when the accuracy requirements come from stereoscopic vision. The method for measuring stereo camera depth accuracy was validated with a stereo camera built of two SLRs (singlelens reflex). The depth resolution of the SLRs was better than normal stereo acuity at all measured distances ranging from 0.7 m to 5.8 m. The method was used to evaluate the accuracy of a lower quality stereo camera. Two parameters, focal length and baseline, were varied. Focal length had a larger effect on stereo camera's depth accuracy than baseline. The tests showed that normal stereo acuity was achieved only using a tele lens. However, a user's depth resolution in a video see-through system differs from direct naked eye viewing. The same test target was used to evaluate this by mixing the levels of the test target randomly and asking users to sort the levels according to their depth. The comparison between stereo camera depth resolution and perceived depth resolution was done by calculating maximum erroneous classification of levels.

Paper Details

Date Published: 27 January 2011
PDF: 9 pages
Proc. SPIE 7864, Three-Dimensional Imaging, Interaction, and Measurement, 78640I (27 January 2011); doi: 10.1117/12.872015
Show Author Affiliations
Mikko Kytö, Aalto Univ. School of Science and Technology (Finland)
Mikko Nuutinen, Aalto Univ. School of Science and Technology (Finland)
Pirkko Oittinen, Aalto Univ. School of Science and Technology (Finland)

Published in SPIE Proceedings Vol. 7864:
Three-Dimensional Imaging, Interaction, and Measurement
J. Angelo Beraldin; Ian E. McDowall; Atilla M. Baskurt; Margaret Dolinsky; Geraldine S. Cheok; Michael B. McCarthy; Ulrich Neuschaefer-Rube, Editor(s)

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