Abstract
In this study, towards implementation of surveillance cameras as an optical infrastructure health monitoring system, camera pair consists of different formats are considered. In contrast to the typical three dimensional digital image correlation system; whenever surveillance system is implemented as optical capture devices, optics and sensors of the camera pairs are not always identical. Gray levels, spatial resolutions, fields of view, synchronization and sizes of captured images might be different; the obtained images must be normalized into same format by image transformations with pre-obtained CCD camera calibration data and geometrical relations before the images analyzed by DIC method. To perform the experiments, a home-made imaging system consists of three camera are first implemented. Two of the cameras have the same optical head but the other is different. A cylindrical tube is used as the specimen, capturing images before and after moving the cylindrical tube. All captured images of different cameras are combined into three different image-pairs and then analyzed by commercial 3D-DIC software to evaluate mean displacement U, V, W, and the associated strain εxx, εyy, εxy to evaluate the potential concerns while different cameras are used for displacement determination.
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Acknowledgements
The study is performed thanks to the financial support provided by the Ministry of Science and Technology of Taiwan, R.O.C. (Grant No. NSC-102-2221-E-492-014 and MOST-103-2221-E-492-017) is greatly appreciated.
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© 2016 The Society for Experimental Mechanics, Inc.
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Hwang, CH., Wang, WC., Chen, YH., Chen, CY., Ya, HC. (2016). Displacement Measurement by DIC Method with Cameras of Different Formats. In: Jin, H., Yoshida, S., Lamberti, L., Lin, MT. (eds) Advancement of Optical Methods in Experimental Mechanics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-22446-6_12
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DOI: https://doi.org/10.1007/978-3-319-22446-6_12
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