Modified correlation criterion for digital image correlation considering the effect of lighting variations in deformation measurements

Bei Peng; Qiushu Zhang; Wu Zhou; Xiaohong Hao; Li Ding

doi:10.1117/1.OE.51.1.017004

13 February 2012 Modified correlation criterion for digital image correlation considering the effect of lighting variations in deformation measurements

Bei Peng, Qiushu Zhang, Wu Zhou, Xiaohong Hao, Li Ding

Author Affiliations +

Funded by: National Natural Science Foundation of China, Chinese Postdoctoral Foundation, Fundamental Research Funds for the Central Universities

Optical Engineering, Vol. 51, Issue 1, 017004 (February 2012). https://doi.org/10.1117/1.OE.51.1.017004

Abstract

The Newton-Raphson (N-R) algorithm based on the sum of squared differences (SSD) function used in the digital image correlation (DIC) may obtain unreliable results in deformation measurements because light source variation is not taken into account. Here, a modified N-R algorithm that includes the effect of light source variations on the measurement results is presented. Instead of involving the mean value and square sum of the gray value of the object, variables were employed in the proposed algorithm. Thus, we refer to it as variables-based sum of squared differences (VSSD) function. VSSD has been validated by comparing the computer generated speckle images, which indicates that it could give rise to more accurate results in calculating deformation than SSD when the surrounding light source changes. In addition, VSSD is compared with the zero-normalized sum of squared differences (ZNSSD) function that is often used to remove the light source variation. The results show that VSSD can achieve the same accuracy within in less time compared to ZNSSD.

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Bei Peng, Qiushu Zhang, Wu Zhou, Xiaohong Hao, and Li Ding "Modified correlation criterion for digital image correlation considering the effect of lighting variations in deformation measurements," Optical Engineering 51(1), 017004 (13 February 2012). https://doi.org/10.1117/1.OE.51.1.017004

Published: 13 February 2012

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