A study of sub-pixel interpolation algorithm in digital speckle correlation method

Yong Lv; Qibo Feng; Liangyu Qi

doi:10.1117/12.807128

2 February 2009 A study of sub-pixel interpolation algorithm in digital speckle correlation method

Yong Lv, Qibo Feng, Liangyu Qi

Proceedings Volume 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications; 71602T (2009) https://doi.org/10.1117/12.807128
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

Sub-pixel interpolation technique is a way that getting sub-pixel gray value by interpolation algorithm and then it is substituted into the correlation expression to calculate the sub-pixel position. It is a key way to improve the displacement measurement accuracy in Digital Speckle Correlation Method (DSCM), meanwhile, it is more time consuming than other steps. A new quarter sub-pixel registration method is proposed which can significantly cut down the sub-pixel searching time. On the premise of not reducing accuracy, an improved Taylor's series expansion in gradient algorithm is used to get higher registration speed. At the same time, a new cubic convolution interpolation method is proposed to get extremely high accuracy. These conclusions are proved by the results of the experimental system.

Citation Download Citation

Yong Lv, Qibo Feng, and Liangyu Qi "A study of sub-pixel interpolation algorithm in digital speckle correlation method", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71602T (2 February 2009); https://doi.org/10.1117/12.807128

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