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(5)　STUDY ON DISCRIMINANT METHODS OF WINTER PAVEMENT CONDITIONS BY IMAGE PROCESSING
　　　　　　Proceedings of the XIth International Winter Road Congress (Sapporo, 2001),pp.V93―1-12, 2002-1

　Winter road conditions change substantially depending on weather and traffic conditions. For example, wet or slushy road surface conditions produced by daytime warmth or sunshine turn into ice crust or ice films at night. In road management, determining the timing and appropriate measures requires accurate assessment of road surface conditions.
　There are concerns about using of only buried sensors to detect local road conditions. A method that can cover a wide area and accurately determine the condition of the entire surface is needed.
　At present, an electric capacitance meter, an electric conductivity meter and a road surface reflectometer are used to measure moisture, including snow and ice, on road surfaces. A road surface sensor and a radiation thermometer are used to measure road surface temperature and atmospheric temperature.
　In this study, we employed digital image processing as a discriminant method for wide areas and reported the results of the examination of digital images of various road surface conditions procured in the laboratory experiment and in the field.