INTERREFLECTION DETECTION DEVICE, INTERREFLECTION DETECTION METHOD, AND PROGRAM

摘要

Provided is an interreflection detection device comprising: an radiation means that radiates light of variable-frequency sinusoidal wave patterns; an image acquisition means that acquires an image of an object irradiated with the light from the radiation means; a phase determination means that determines, from the image, the phase at each of multiple positions; and a detection means that detects a region in which interreflection is occurring. The detection means calculates, for a plurality of combinations of low frequency and high frequency, a phase difference between a phase obtained from an image acquired when radiating a low frequency sinusoidal wave pattern and a phase obtained from an image acquired when radiating a high frequency sinusoidal wave pattern, and determines that interreflection is occurring in a region in which the phase difference for one of the plurality of combinations is at or above a threshold.