| http://www.w3.org/ns/prov#value | - Assuming that region A has low reflectance due to contamination or the like, the reflected light amount of region A decreases in the distribution of Ref_data[N], as shown in FIG. 13A. In this state, when a pointing device such as a finger or the like is inserted and covers nearly half the recurrent reflector, as shown in FIG. 12, the reflected light amount is nearly halved, and a distribution Norm
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