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Evaluation of Advanced Machine-Vision Sensors for Measuring the Tread Depth of a Tire
Technical Paper
2014-01-0069
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Traditional tread depth measurements require manual utilization of a mechanical device to acquire measurements at each location of interest on a tire. Drive-over machine-vision sensors are becoming available as a means for measuring tread depth. These sensors typically consist of a laser and a camera contained in an environmentally-sealed sensor housing. Tires approach the sensor over the supporting surface, while a laser projects an illuminating line across the tread surface for capture in a digital image. This scan is evaluated to provide a single 2D contour of tread depth at the illuminated line. Advanced machine-vision sensors acquire a sequence of images, which results in a multitude of data points over a 3D region of the tread surface. Post-processing of the acquired images illustrates the observed tread pattern and establishes multiple tread depth measurements.
Measurements determined by the advanced sensors from hundreds of tires were compared to manual measurements acquired with analog and digital mechanical gauges. The advanced drive-over machine-vision sensors out-perform manual measurements. Manual measurements introduced errors due to variations in the selected measurement locations on the tire tread, operation of the mechanical gauge, and limited data points. In contrast, the advanced machine vision systems consistently acquired a multitude of data points over an observed 3D region of tread surface, enabling evaluation of the tread pattern. Averaging and other post-processing analysis techniques produced accurate tread depth measurements which were not subject to operator-introduced variables.
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Authors
Citation
Nevin, A. and Daoud, E., "Evaluation of Advanced Machine-Vision Sensors for Measuring the Tread Depth of a Tire," SAE Technical Paper 2014-01-0069, 2014, https://doi.org/10.4271/2014-01-0069.Also In
References
- Federal Motor Vehicle Safety Standards
- Tandy , D. , Coleman , C. , and Ray , R. , An Objective Analysis of the Effect of Tire Tread Depth on Crash Causation and Wet Road Vehicle Dynamics SAE Int. J. Passeng. Cars - Mech. Syst. 6 1 187 224 2013 10.4271/2013-01-0701
- See for example et al. Method And Apparatus For Tire Tread Measurement U.S. Patent 7,975,540 B2 July 12 2011 Lionetti et al. Tread Depth Sensing Device And Method For Measuring Same U.S. Patent 7,578,180 B2 August 25 2009 Whitehead Apparatus For Testing Tire Tread Depth U.S. Patent 5,987,978 November 23 1999