An improved method for shape measurement using two-dimensional digital image correlation |
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Authors: | Xing Xu Kaifu WangGuoqing Gu |
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Institution: | College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing, Jiangsu 210016, PR China |
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Abstract: | Shape measurement is a significant application of digital image correlation (DIC). An improved method that combines a rotatable plane mirror is proposed to measure the shape of an immovable object. In this method, two images, one before and the other after rotating the plane mirror, are obtained and then in-plane translation which related to the shape of the detected object can be calculated by the use of two-dimensional digital image correlation (2D DIC). The relationship between the in-plane translation and the shape of the object is described. Experimental results show that the proposed method is feasible for shape and distance measurement with high accuracy. |
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Keywords: | Digital image correlation Shape measurement Plane mirror rotation Newton-Raphson iteration Bicubic spline interpolation |
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