| 摘要 |
PROBLEM TO BE SOLVED: To discriminate the road surface condition at a high accuracy by finally discriminating the road surface condition after weighting the discriminated result of the road condition, based on past snow fall history information. SOLUTION: A TV camera 11 is disposed for the overlooking photograph of the road surface at an angle near the Brewster angle of 53 deg. of water to the road surface normal N to possibly increase the ratio of a vertical polarization component to a horizontal polarization component to accurately discriminate. From vertically and horizontally polarized lights images of the discriminated road surface thus obtained, a plurality of characteristic quantities about the road surface condition are calculated to discriminate the road surface condition, based on the statistic analysis from these characteristic quantities and air or road temps. at the time. The discriminated result is weighted, based on past snow fall history information, and then the road surface condition is finally discriminated. Thus, the road surface condition can be accurately judged even in a circumstance having influences of the sunshine, shadow of crows, etc., on photography data.
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