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Proceedings Paper

Distinguishing the road conditions of dry, aquaplane, and frozen by using a three-color infrared camera
Author(s): Toru Tabuchi; Shigeki Yamagata; Tetsuo Tamura
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Paper Abstract

There are increasing demands for information to avoid accident in automobile traffic increase. We will discuss that an infrared camera can identify three conditions (dry, aquaplane, frozen) of the road surface. Principles of this method are; 1.We have found 3-color infrared camera can distinguish those conditions using proper data processing 2.The emissivity of the materials on the road surface (conclete, water, ice) differs in three wavelength regions. 3.The sky's temperature is lower than the road's. The emissivity of the road depends on the road surface conditions. Therefore, 3-color infrared camera measure the energy reflected from the sky on the road surface and self radiation of road surface. The road condition can be distinguished by processing the energy pattern measured in three wavelength regions. We were able to collect the experimental results that the emissivity of conclete is differ from water. The infrared camera whose NETD (Noise Equivalent Temperature Difference) at each 3-wavelength is 1.0C or less can distinguish the road conditions by using emissivity difference.

Paper Details

Date Published: 1 April 2003
PDF: 7 pages
Proc. SPIE 5073, Thermosense XXV, (1 April 2003); doi: 10.1117/12.502153
Show Author Affiliations
Toru Tabuchi, NEC San-ei Instruments, Ltd. (Japan)
Shigeki Yamagata, NEC Corp. (Japan)
Tetsuo Tamura, NEC San-ei Instruments, Ltd. (Japan)

Published in SPIE Proceedings Vol. 5073:
Thermosense XXV
K. Elliott Cramer; Xavier P. Maldague, Editor(s)

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