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Parameter choice for optimized digital image correlation
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DOI：10.1016/j.optlaseng.2008.10.015.png)
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摘要
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Digital image correlation is a photomechanical technique utilized to measure displacement fields. Although the method has been used successfully in a variety of applications, there is a need for guidelines to choose correlation parameters and for an understanding of their link with the analyzed texture and their effect on the uncertainty of measured quantities. In this paper, two criteria are proposed from a texture study to evaluate the best compromise between measurement uncertainty and spatial resolution prior to any mechanical test. These criteria are then validated on a Priori uncertainty evaluations with different textures, and on a real experiment when comparing image correlation results with strain gauge data. (c) 2008 Published by Elsevier Ltd.
Keyword:
Digital image correlation
Texture
Optimization
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