Influences of imaging configurations on the accuracy of digital image correlation measurement
Influences of imaging configurations on the accuracy of digital image correlation measurement
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DOI：
10.1088/1361-6501/aa9e6a
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shaopeng Ma
中科院分区：
文献类型：
--
作者：
Haibin Zhu;Xuejin Liu;Lingfeng Chen;Qinwei Ma;Shaopeng Ma
Compared to other approaches to improving digital image correlation (DIC) measurement accuracy, improving image quality becomes a more effective way. Image noise level, which is the main indicator of image quality, is very sensitive to the configurations of an imaging system and affects DIC measurement accuracy. However, the mechanism by which the imaging configurations affect accuracy is unclear. In this study, the influences of imaging configurations on DIC measurement accuracy were investigated using the common factor of noise. The type and levels of noise introduced into actual images by different imaging system configurations were first investigated. Next, the effect of noise on DIC measurement accuracy was determined using simulated images. Finally, the effects of image configurations on DIC measurement accuracy were experimentally investigated using actual measurements. The results show that both camera-related and lens-related configurations affect the DIC measurement accuracy. In particular, lengthening the exposure time and reducing the f-number of the lens achieve similar improvement in DIC measurements accuracy, and a prime lens with high light transmittance is recommended for full-field optical measurements. In contrast, the imaging gain does not affect the accuracy of DIC measurements.
