Generalized Gradient Based Digital Image Correlation Method for Displacement with Subpixel Accuracy

Rui Zhang

doi:10.4028/www.scientific.net/AMM.444-445.168

Paper Titles

Stability Analysis of Double-Walled Carbon Nanotubes with Initial Stress
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Study of Stress Wave Propagation in SHPB with NHDMOC
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Analysis of Euler-Bernoulli Beam with Piecewise Quadratic Hermite Finite Elements
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Generalized Gradient Based Digital Image Correlation Method for Displacement with Subpixel Accuracy
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 444-445Generalized Gradient Based Digital Image...

Generalized Gradient Based Digital Image Correlation Method for Displacement with Subpixel Accuracy

Abstract:

Basic principle of generalized gradient based digital image (DIC) method for subpixel-accuracy displacement measurement is discussed. The proposed method can cope well with lighting illumination variation or grayscale intensity change on the object surface during measurement by adopting a linear intensity change model, which overcomes the limitations in existing linear least squares based spatial gradient method by adopting constant model. To evaluate the proposed methods, both computer simulation and actual experiment have been carried out. The results show that the proposed method can measure displacement accurately even when substantial intensity variations exist in the experimental images.

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Periodical:

Applied Mechanics and Materials (Volumes 444-445)

Pages:

168-172

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.444-445.168

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Online since:

October 2013

Authors:

Rui Zhang

Keywords:

Digital Image Correlation (DIC), Liner Least Squares, Spatial Gradient Method, Subpixel Accuracy

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