1. An imaging processing system comprising: one or more image capturing apparatuses; a reading unit configured to read biometric information from an authentication object person; a similarity calculation unit configured to calculate similarity based on a result of comparing biometric information read by the reading unit with true biometric information of the authentication object person; an authentication unit configured to perform authentication based on a comparison between the similarity calculated by the similarity calculation unit and a preliminarily set threshold; and a control unit configured to control, if the authentication performed by the authentication unit is successful, imaging processing, which is performed by the image capturing apparatus, based on the similarity calculated by the similarity calculation unit.