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Proceedings Paper

A study of sub-pixel interpolation algorithm in digital speckle correlation method
Author(s): Yong Lv; Qibo Feng; Liangyu Qi
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Paper 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.

Paper Details

Date Published: 3 February 2009
PDF: 9 pages
Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71602T (3 February 2009); doi: 10.1117/12.807128
Show Author Affiliations
Yong Lv, Beijing Jiaotong Univ. (China)
Beijing Information Science & Technology Univ. (China)
Qibo Feng, Beijing Jiaotong Univ. (China)
Liangyu Qi, Beijing Information Science & Technology Univ. (China)


Published in SPIE Proceedings Vol. 7160:
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications

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