System for PRNU-based origin and authenticity verification of digital image and video data with standardized enrollment

Abstract

A system for the forensic origination of digital image and video data, comprising: • an enrollment unit for capturing a multi-image set consisting of at least three reference images per physical camera, • a fingerprint extraction unit for generating a camera-specific PRNU reference fingerprint from the multi-image set, • a storage unit with an enrollment data record containing at least one enrollment identifier, the PRNU reference fingerprint, and a capture source, • an analysis unit for generating a query PRNU fingerprint from an image or video medium to be examined, • a comparison module for determining a correlation-based similarity value between the query PRNU fingerprint and the PRNU reference fingerprint, • and a classification module, characterized in that the classification module, using a first threshold value T_min, generates an unassigned output if the highest determined similarity value is below T_min.An ambiguous output is generated if the largest determined similarity value is at least T_min and at least two enrollment records have similarity values ​​that lie within a specified tolerance interval around the maximum value; and an associated output is generated if the largest determined similarity value is at least T_min and the ambiguity case does not exist.