Patent ID: 7634107

Claim:
A roadway type judgment method, comprising: calculating, with respect to image data from a camera mounted in or on a vehicle or image data obtained by carrying out a specified conversion on said image data from said camera, a feature amount of at least one component among a plurality of components in a specified color space of the image, and storing the calculated feature amount into a feature amount data storage; determining whether or not said feature amount stored in said feature amount data storage satisfies a predetermined condition; and judging, based on a determination result in said determining, whether or not said vehicle travels inside a tunnel, and wherein said feature amount in said calculating includes a feature amount of intensity and a feature amount of hue, said predetermined condition includes a condition relating to said intensity and a condition relating to said hue, and said feature amount of said intensity is an average value of intensity values, and said feature amount of said hue is a variance value of hue values.