Lens distortion correction for micro-scale digital image correlation

Wenjie Qian; Qi Zhu; Lei Chen; Jianguo Zhu

doi:10.1117/12.2500168

24 July 2018 Lens distortion correction for micro-scale digital image correlation

Wenjie Qian, Qi Zhu, Lei Chen, Jianguo Zhu

Author Affiliations +

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 1082706 (2018) https://doi.org/10.1117/12.2500168
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

Abstract

Digital image correlation (DIC) combined with an optical microscope has been used to realize the micro scale deformation measurement; micro-scale speckle pattern film was fabricated by spinning an epoxy resin and powder, and transferred to the surface of a test specimen. Generally, measurement accuracy of a 2D DIC will be affected by the small out-of-plane displacement of the test specimen. However, a telecentric lens is not convenient to be used in micro-scale digital image correlation to minimize the measurement displacement error. Thus, measurement error due to geometrical lens aberration, or lens distortion, should be corrected to overcome this problem. Camera calibration including lens distortion is considered in this paper. A corresponding distortion model was constructed and the distortion coefficient was determined by a rigid-body translation experiment using the fabricated micro speckle patterns. The distortion image was calibrated using a first-order aberration function. The results show that the relative error of the rigid-body translations was reduced 50%. Therefore, the proposed method can effectively correct the lens distortion under the large-magnification microscope.

Citation Download Citation

Wenjie Qian, Qi Zhu, Lei Chen, and Jianguo Zhu "Lens distortion correction for micro-scale digital image correlation", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082706 (24 July 2018); https://doi.org/10.1117/12.2500168

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KEYWORDS

Distortion

Digital image correlation

Calibration

Speckle pattern

Optical microscopes

Microscopes

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