Comparative Analysis of Warp Function for Digital Image Correlation-Based Accurate Single-Shot 3D Shape Measurement

Digital image correlation (DIC)-based stereo 3D shape measurement is a kind of single-shot method, which can achieve high precision and is robust to vibration as well as environment noise. The efficiency of DIC has been greatly improved with the proposal of inverse compositional Gauss-Newton (IC-GN)...

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Vydáno v:Sensors (Basel, Switzerland) Ročník 18; číslo 4; s. 1208
Hlavní autoři: Yang, Xiao, Chen, Xiaobo, Xi, Juntong
Médium: Journal Article
Jazyk:angličtina
Vydáno: Switzerland MDPI AG 16.04.2018
MDPI
Témata:
Comparative analysis
digital image correlation
Efficiency
European Monetary Union
inverse compositional Gauss-Newton algorithm
single-shot 3D shape measurement
warp function
inverse compositional Gauss-Newton algorithm
single-shot 3D shape measurement
warp function
digital image correlation
ISSN:1424-8220, 1424-8220
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Shrnutí:Digital image correlation (DIC)-based stereo 3D shape measurement is a kind of single-shot method, which can achieve high precision and is robust to vibration as well as environment noise. The efficiency of DIC has been greatly improved with the proposal of inverse compositional Gauss-Newton (IC-GN) operators for both first-order and second-order warp functions. Without the algorithm itself, both the registration accuracy and efficiency of DIC-based stereo matching for shapes with different complexities are closely related to the selection of warp function, subset size, and convergence criteria. Understanding the similarity and difference of the impacts of prescribed subset size and convergence criteria on first-order and second-order warp functions, and how to choose a proper warp function and set optimal subset size as well as convergence criteria for different shapes are fundamental problems in realizing efficient and accurate 3D shape measurement. In this work, we present a comparative analysis of first-order and second-order warp functions for DIC-based 3D shape measurement using IC-GN algorithm. The effects of subset size and convergence criteria of first-order and second-order warp functions on the accuracy and efficiency of DIC are comparatively examined with both simulation tests and real experiments. Reference standards for the selection of warp function for different kinds of 3D shape measurement and the setting of proper convergence criteria are recommended. The effects of subset size on the measuring precision using different warp functions are also concluded.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s18041208