Synaptics Incorporated
Defensive measures for residue re-imaging

Abstract:

An input device includes a fingerprint sensor and a processing system. The fingerprint sensor is configured to capture images of a sensing region of the input device. The processing system is configured to acquire a first image of the sensing region, where the first image includes one or more fingerprints. The processing system compares the first image with one or more adjunct templates to determine a similarity score for each of the one or more fingerprints. The processing system further compares at least one of the fingerprints with one or more fingerprints templates to determine a match score, and selectively authenticates the first image based at least in part on the similarity score and the match score.