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Sensors 2018, 18(12), 4296; https://doi.org/10.3390/s18124296

Reliable and Accurate Wheel Size Measurement under Highly Reflective Conditions

Ministry of Education Key Laboratory of Precision Opto-Mechatronics Technology, Beihang University, Beijing 100083, China
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Received: 4 November 2018 / Revised: 28 November 2018 / Accepted: 30 November 2018 / Published: 6 December 2018
(This article belongs to the Section Physical Sensors)
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Abstract

Structured-light vision sensor, as an important tool for obtaining 3D data, is widely used in fields of online high-precision measurement. However, the captured stripe images can show high-dynamic characteristics of low signal-to-noise ratio and uneven brightness due to the complexity of the onsite environment. These conditions seriously affect measurement reliability and accuracy. In this study, a wheel size measurement framework based on a structured-light vision sensor, which has high precision and reliability and is suitable for highly reflective conditions, is proposed. Initially, the quality evaluation criterion of stripe images is established, and the entire stripe is distinguished into high- and low-quality segments. In addition, the multi-scale Retinex theory is adopted to enhance stripe brightness, which improves the reliability of subsequent stripe center extraction. Experiments verify that this approach can remarkably improve measurement reliability and accuracy and has important practical value. View Full-Text
Keywords: High dynamic; reflective conditions; stripe image enhancement; wheel size measurement High dynamic; reflective conditions; stripe image enhancement; wheel size 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).
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Pan, X.; Liu, Z.; Zhang, G. Reliable and Accurate Wheel Size Measurement under Highly Reflective Conditions. Sensors 2018, 18, 4296.

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