A modified digital image correlation with enhanced speed and improved accuracy

Digital image correlation (DIC) is widely applied in optical measurement field. In this work, the classical DIC algorithm is modified to improve the speed and enhance the measurement accuracy. A Butterworth function is installed on the traditional sum-of-squared differences correlation criterion. And inverse compositional Gauss-Newton is carried out. The computer generated speckle patterns are used to demonstrate the presented algorithm. The results declare the proposed method can improve the speed with enhanced measurement accuracy.

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