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A stereo vision-based obstacle detecting method for mobile robot navigation

Published online by Cambridge University Press:  09 March 2009

Yong C. Cho  and
Hyung S. Cho
Yong C. Cho
Affiliation:
Department of Precision Engineering and Mechatronics, KAIST, 373–1, Kusong-dong, Yusong-gu, Taejon, 305–701 (Korea)
Hyung S. Cho
Affiliation:
Department of Precision Engineering and Mechatronics, KAIST, 373–1, Kusong-dong, Yusong-gu, Taejon, 305–701 (Korea)
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Summary

This paper presents a computationally simple stereo vision method for detecting useful features of obstacles on the ground relevant to a mobile robot's navigation in an indoor environment. Enhanced time efficiency and reliability is achieved by introducing a geometrical image transformation and a frame-wise iterative edge image comparison scheme. The image transformation used in this paper relates each constant disparity value to an oblique plane at an elevation from the floor. The stereo correspondence method is devised by implementing a frame-wise AND operation based upon edge orientation and a subsequent pixel wise intensity correlation checking. This method is efficient in terms of computation time and capable of identifying isodisparity points, so that the height information of all the obstacle points above the floor can be determined. The obtained disparities are recorded on a local map to give complete obstacle features for mobile robot's path planning. Through a series of experiments performed under various environmental conditions, it is found that the proposed method can effectively be applied for locating obstacles of various heights in indoor navigation of mobile robots.

Keywords

Mobile robotObstacle detectionStereo visionFloor planeStereo correspondence.
Type
Article
Information
Robotica , Volume 12 , Issue 3 , May 1994 , pp. 203 - 216
Copyright
Copyright © Cambridge University Press 1994

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