Abstract
The accuracy of precision measurement is an essential requirement for precision positioning. This paper presents a new precision measurement method by combining the uniqueness analysis of laser speckle patterns (LSPs) and the template matching algorithm. In this paper, an invariant speckle capturing device and template matching criteria are developed. Experimental results have shown that LSPs can demonstrate different unique and invariant properties even though they are captured from the same material but different samples. Also, accurate direction and displacement information of moving LSPs can be obtained in real-time. Therefore, this merit can provide the potential of speckle pattern analysis for applications of precision positioning in the future.
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