| http://www.w3.org/ns/prov#value | - ight, an imaging lens unit 1403, comprised of optical components, such as lenses, for collecting the reflected light from the road surface S, an imaging unit 1404 for imaging the reflected light, an image processing calculating unit 1405 for processing the image, a relative movement amount processor 1406 for determining the amount of relative movement between the foot and the road surface based on
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