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Optical Engineering

Real-time finger-controlled navigation system using laser speckle patterns
Author(s): Chih-Ming Liao; Ping Sheng Huang; Chung-Cheng Chiu; Yi-Yuh Hwang; Shin-I Ma
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Paper Abstract

We used the invariance of moving laser speckle patterns to develop a finger-controlled navigation system. Laser speckle images were captured using a commercially available image sensor. The relationships between template image size, available movement range, and a maximum correlation coefficient were derived. An essential criterion for setting the correlation coefficient threshold value was determined, and a displacement estimation algorithm was developed. A navigation system test platform and an accuracy analysis program were developed to monitor system performance related to variations in the template image size and the correlation threshold value. The experimental results suggest that the proposed design would be suitable to guide further development of finger-controlled navigation systems using laser speckle patterns.

Paper Details

Date Published: 1 May 2010
PDF: 8 pages
Opt. Eng. 49(5) 054301 doi: 10.1117/1.3431669
Published in: Optical Engineering Volume 49, Issue 5
Show Author Affiliations
Chih-Ming Liao, National Defense Univ. (Taiwan)
Ping Sheng Huang, Ming Chuan Univ. (Taiwan)
Chung-Cheng Chiu, National Defense Univ. (Taiwan)
Yi-Yuh Hwang, Chung-Shan Institute of Science and Technology (Taiwan)
Shin-I Ma, Chung-Shan Institute of Science and Technology (Taiwan)


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