Full-field strain measurement using a two-dimensional Savitzky-Golay digital differentiator in digital image correlation

Bing Pan; Huimin Xie; Zhiqing Guo; Tao Hua

doi:10.1117/1.2714926

1 March 2007 Full-field strain measurement using a two-dimensional Savitzky-Golay digital differentiator in digital image correlation

Bing Pan, Huimin Xie, Zhiqing Guo, Tao Hua

Author Affiliations +

Optical Engineering, Vol. 46, Issue 3, 033601 (March 2007). https://doi.org/10.1117/1.2714926

Abstract

Many published research works regarding digital image correlation (DIC) have been focused on the improvements of the accuracy of displacement estimation. However, the original displacement fields calculated at discrete locations using DIC are unavoidably contaminated by noises. If the strain fields are directly computed by differentiating the original displacement fields, the noises will be amplified even at a higher level, and the resulting strain fields are untrustworthy. Based on the principle of local least-square fitting using two-dimensional (2D) polynomials, a 2D Savitzky-Golay (SG) digital differentiator is deduced and used to calculate strain fields from the original displacement fields obtained by DIC. The calculation process can be easily implemented by convolving the SG digital differentiator with the estimated displacement fields. Both homogeneous and inhomogeneous deformation images are employed to verify the proposed technique. The calculated strain fields clearly demonstrate that the proposed technique is simple and effective.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Bing Pan, Huimin Xie, Zhiqing Guo, and Tao Hua "Full-field strain measurement using a two-dimensional Savitzky-Golay digital differentiator in digital image correlation," Optical Engineering 46(3), 033601 (1 March 2007). https://doi.org/10.1117/1.2714926

Published: 1 March 2007

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available