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Sensors 2018, 18(2), 525; doi:10.3390/s18020525

Parametric Evaluation of Errors Using Isolated Dots for Movement Measurement by Image Cross-Correlation

1
Civil Engineering department, University of Alicante, Carretera San Vicente del Raspeig, s/n, 03690 Sant Vicent del Raspeig, Spain
2
Institute of Physics Applied to Sciences and Technologies, University of Alicante, Carretera San Vicente del Raspeig, s/n, 03690 San Vicente del Raspeig, Spain
*
Author to whom correspondence should be addressed.
Received: 22 December 2017 / Revised: 5 February 2018 / Accepted: 6 February 2018 / Published: 9 February 2018
(This article belongs to the Special Issue Sensor Signal and Information Processing)
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Abstract

Digital Image Correlation (DIC) is a common tool for assessing the movement of objects in a scene. Among others, one of the most popular techniques consists of tracking a dotted texture imitating speckle patterns. In this work, we analyzed the individual dots that form this pattern in order to propose an optimum size, shape, and dynamic range that allows minimizing the tracking error. Tracking was accomplished by using normalized cross-correlation with peak interpolation in order to obtain subpixel accuracy. For the models here used, we show that dot radii of 30–40 px with 150 gray levels are enough to obtain an accurate subpixel tracking resolution. Also, we show that 0.002 px is the performance limit of this technique, being this limit in accordance with the experimentally achievable subpixel limit. View Full-Text
Keywords: normalized cross-correlation; subpixel tracking accuracy; simulated speckle; error; movement measurement normalized cross-correlation; subpixel tracking accuracy; simulated speckle; error; movement measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

  • Externally hosted supplementary file 1
    Link: https://goo.gl/99VHXs
    Description: Matlab code for generating the tracking tests

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Ferrer, B.; Mas, D. Parametric Evaluation of Errors Using Isolated Dots for Movement Measurement by Image Cross-Correlation. Sensors 2018, 18, 525.

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