Digital speckle displacement measurement by a thresholding technique

Dong Hui Li; Li Guo; Tian Qiu

doi:10.1117/12.676936

23 February 2006 Digital speckle displacement measurement by a thresholding technique

Dong Hui Li, Li Guo, Tian Qiu

Proceedings Volume 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 615059 (2006) https://doi.org/10.1117/12.676936
Event: 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2005, Xian, China

Abstract

The digital speckle measurement technique has a wide-range application. This paper proposed a thresholding method, which is different from usual template-matching method, to measure the displacement of speckles. To achieve this, the thresholding method employs a statistical process. The statistical analysis is performed on binary speckle images rather than on original grayscale speckle images. The binarization is performed by a thresholding technique. A fast algorithm of the thresholding method is developed which makes it acceptable in practice. A low-pass morphological filter is incorporated into the thresholding method for reducing image's noise. An optical and analysis system is set up to verify the method's validity and improvement.

Citation Download Citation

Dong Hui Li, Li Guo, and Tian Qiu "Digital speckle displacement measurement by a thresholding technique", Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 615059 (23 February 2006); https://doi.org/10.1117/12.676936

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