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The International Journal of Robotics Research
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Surface Profile Determination from Multiple Sonar Data Using Morphological Processing

Deniz Baskent

Department of Electrical Engineering, Bilkent University, Bilkent, 06533 Ankara, Turkeybaskent{at}usc.edu

Billur Barshan

Department of Electrical Engineering, Bilkent University, Bilkent, 06533 Ankara, Turkeybillur{at}ee.bilkent.edu.tr

This paper presents a novel method for surface profile determination using multiple sensors. Our approach is based on morphological processing techniques to fuse the range data from multiple sensor returns in a manner that directly reveals the target surface profile. The method has the intrinsic ability of suppressing spurious readings due to noise, crosstalk, and higher-order reflections, as well as processing multiple reflections informatively. The approach taken is extremely flexible and robust, in addition to being simple and straightforward. It can deal with arbitrary numbers and configurations of sensors as well as synthetic arrays. The algorithm is verified both by simulations and experiments in the laboratory by processing real sonar data obtained from a mobile robot. The results are compared to those obtained from a more accurate structured-light system, which is, however, more complex and expensive.

Key Words: sonar sensing • range sensing • morphological processing • mathematical morphology • surface-profile extraction • map building • pattern recognition • mobile robots

The International Journal of Robotics Research, Vol. 18, No. 8, 788-808 (1999)
DOI: 10.1177/02783649922066565
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