Abstract:

The PRNU (Photo Response Non-Uniformity)-based source camera attribution is a useful method for verifying if a camera has taken an image (e.g., a crime image). Although this method has matured for images taken by single-camera smartphones, its usability is yet unknown for multi-camera smartphones. A multi-camera smartphone, such as iPhone XS or Huawei P20 Pro, combines output from a number of rear cameras for providing high-quality images. In this paper, we study the effectiveness of the PRNU-based method for a multi-camera smartphone using two simple approaches: (i) multifingerprint verification, and (ii) mixed fingerprint verification. In the verification process, the first approach uses fingerprint from each camera whereas the second approach uses a mixed-fingerprint that is obtained by averaging the fingerprints from all cameras. The experimental result shows that the proposed approaches are useful for some camera models. For some other camera models, a more sophisticated method, however, is required.