The first rear image candidate determination unit determines a first rear image candidate from among first object determination images on the basis of a first evaluation value calculated by the first evaluation value calculation unit and a first evaluation criterion stored in the first evaluation criterion storage unit. For example, the first rear image candidate determination unit determines a first object determination image (which may be one or a plurality of object determination images) in which a first evaluation value equal to or greater than a first evaluation criterion has been calculated, to be the first rear image candidate.
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