Investigation of retroreflector characteristics using computer-vision method

Huayang He; Wenying Su; Yingqi Xue; Xiaokun Han

doi:10.1117/12.2574770

15 June 2020 Investigation of retroreflector characteristics using computer-vision method

Huayang He, Wenying Su, Yingqi Xue, Xiaokun Han

Proceedings Volume 11523, Optical Technology and Measurement for Industrial Applications 2020; 115230A (2020) https://doi.org/10.1117/12.2574770
Event: SPIE Technologies and Applications of Structured Light, 2020, Yokohama, Japan

Abstract

In a dark channel of more than 15 m, a standard A light source was used to simulate a motor vehicle's headlight, and a Nikon D750 digital camera was used as a light receiver. While the observation angle α was 0.33°, the entrance angle component β1 was −4°, the entrance angle component β2 was 0°, and the coefficients of retroreflection of the retroreflectors were measured. The entrance angle component β1 changed from −4° to 0°, and the chromaticity coordinates of retroreflectors were then measured. Experimental results show that the maximum measurement error of the coefficient of retroreflection is −2.09%, and the measured results of the chromaticity coordinates meet the national standard of retroreflective sheeting for traffic control. Obviously, the RAW data output from the camera has a linear association with the luminous flux on the surface of retroreflectors, which can be used to calculate the coefficients of retroreflection and the chromaticity coordinates.

Citation Download Citation

Huayang He, Wenying Su, Yingqi Xue, and Xiaokun Han "Investigation of retroreflector characteristics using computer-vision method", Proc. SPIE 11523, Optical Technology and Measurement for Industrial Applications 2020, 115230A (15 June 2020); https://doi.org/10.1117/12.2574770

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