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23 February 2006 Digital speckle displacement measurement by fuzzy logic correlation
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Abstract
Fuzzy set has an advantage over classic set for representation of objects with a high degree of vagueness, inaccurate, or uncertainty. Fuzzy set theory could be seen as a generalization of classic set theory. In this paper, a digital speckle correlation method based on fuzzy logic (DSCMF) is proposed to measure the displacement of laser speckles. DSCMF is developed to improve performances of the digital speckle correlation method based on classic logic (DSCMC), at the same time keeping low computation simplicity. Fuzzy correlation between two images could be defined as an integral of membership of similarity between elements of two images. Membership function of similarity is defined to represent the distance of two values. An optical and analysis system was set up to verify DSCMF's validity. A parameter δSN is introduced to represent the ratio of signal to noise. Experimental results show that DSCMF using triangle tent similarity membership function could obtain a bigger tδSN than DSCMC could. This paper also shows the influence on δSN of quantification of membership function.
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Dong Hui Li, Li Guo, and Tian Qiu "Digital speckle displacement measurement by fuzzy logic correlation", Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61505A (23 February 2006); https://doi.org/10.1117/12.676937
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