Blind guidance system based on laser triangulation

Jih-Huah Wu; Jinner-Der Wang; Hai-Ko Kao; Wei Fang; Yi-Chia Shan; Joe-Air Jiang; Yun-Parn T. Lee; Shih-Hsin Ma

doi:10.1117/1.OE.51.5.054302

7 May 2012 Blind guidance system based on laser triangulation

Jih-Huah Wu, Jinner-Der Wang, Hai-Ko Kao, Wei Fang, Yi-Chia Shan, Joe-Air Jiang, Yun-Parn T. Lee, Shih-Hsin Ma

Author Affiliations +

Optical Engineering, Vol. 51, Issue 5, 054302 (May 2012). https://doi.org/10.1117/1.OE.51.5.054302

Abstract

We propose a new guidance system for the blind. An optical triangulation method is used in the system. The main components of the proposed system comprise of a notebook computer, a camera, and two laser modules. The track image of the light beam on the ground or on the object is captured by the camera and then the image is sent to the notebook computer for further processing and analysis. Using a developed signal-processing algorithm, our system can determine the object width and the distance between the object and the blind person through the calculation of the light line positions on the image. A series of feasibility tests of the developed blind guidance system were conducted. The experimental results show that the distance between the test object and the blind can be measured with a standard deviation of less than 8.5% within the range of 40 and 130 cm, while the test object width can be measured with a standard deviation of less than 4.5% within the range of 40 and 130 cm. The application potential of the designed system to the blind guidance can be expected.

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Jih-Huah Wu, Jinner-Der Wang, Hai-Ko Kao, Wei Fang, Yi-Chia Shan, Joe-Air Jiang, Yun-Parn T. Lee, and Shih-Hsin Ma "Blind guidance system based on laser triangulation," Optical Engineering 51(5), 054302 (7 May 2012). https://doi.org/10.1117/1.OE.51.5.054302

Published: 7 May 2012

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KEYWORDS

Distance measurement

Cameras

Image processing

Laser systems engineering

Image sensors

Image segmentation

Imaging systems

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