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	Study on subset size selection in digital image correlation for speckle patterns
	Bing Pan ; Huimin Xie ; Zhaoyang Wang ; Kemao Qian ; Zhiyong Wang
	2010-10-12 ; 2010-10-12
关键词	Practical Experimental/ optical correlation optical images speckle/ subset size selection digital image correlation speckle patterns deformed image sum of squared differences correlation criterion image noise sum of square of subset intensity gradients DIC analysis/ A4230 Optical information, image formation and analysis A4225H Optical interference and speckle A0760L Optical interferometry B6135 Optical, image and video signal processing
中文摘要	Digital Image Correlation (DIC) has been established as a flexible and effective technique to measure the displacements on specimen surface by matching the reference subsets in the undeformed image with the target subsets in the deformed image. With the existing DIC techniques, the user must rely on experience and intuition to manually define the size of the reference subset, which is found to be critical to the accuracy of measured displacements. In this paper, the problem of subset size selection in the DIC technique is investigated. Based on the Sum of Squared Differences (SSD) correlation criterion as well as the assumption that the gray intensity gradients of image noise are much lower than that of speckle image, a theoretical model of the displacement measurement accuracy of DIC is derived. The theoretical model indicates that the displacement measurement accuracy of DIC can be accurately predicted based on the variance of image noise and Sum of Square of Subset Intensity Gradients (SSSIG). The model further leads to a simple criterion for choosing a proper subset size for the DIC analysis. Numerical experiments have been performed to validate the proposed concepts, and the calculated results show good agreements with the theoretical predictions.
语种	英语
出版者	Optical Society of America ; USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80509]
专题	清华大学
推荐引用方式 GB/T 7714	Bing Pan,Huimin Xie,Zhaoyang Wang,et al. Study on subset size selection in digital image correlation for speckle patterns[J],2010, 2010.
APA	Bing Pan,Huimin Xie,Zhaoyang Wang,Kemao Qian,&Zhiyong Wang.(2010).Study on subset size selection in digital image correlation for speckle patterns..
MLA	Bing Pan,et al."Study on subset size selection in digital image correlation for speckle patterns".(2010).

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