Robust technique of analyzing and locating laser speckle patterns for optical computer mice |
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Authors: | Chih-Ming Liao Ping S Huang Yi-Yuh Hwang Ming Chen Chung-Cheng Chiu |
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Institution: | 1. Department of Electrical and Electronic Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan, Republic of China;2. Department of Electronic Engineering, Ming Chuan University, Taoyuan 333, Taiwan, Republic of China;3. Chung-Shan Institute of Science and Technology, Taoyuan 335, Taiwan, Republic of China |
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Abstract: | Laser speckles have been used in measurement techniques, since they were discovered to be correlated with the displacement of the light source. This paper presents a robust technique of analyzing and locating laser speckle patterns (LSPs) for a prototype of a laser optical mouse. After the speckle images are captured from the image-grabbing device, they are analyzed by the proposed image processing procedures and normalized cross-correlation (NCC) is adopted to develop position-locating rules for laser speckle patterns. To verify robustness of the proposed approach, nine different materials of mouse pad are used. Experimental results show that they have all achieved similar and promising performance. Therefore, the proposed technique can not only precisely calculate the moving directions and displacement information for laser speckles, the linearity for the prototype of laser mouse can also be verified. |
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