Hi libfprint folks - I've got a Digital Persona U.are.U 4500 fingerprint reader, and I'm trying to migrate to libfprint from the closed source drivers I got from Digital Persona themselves.
The driver chosen by libfprint is uru4000, which seems right. When I call fp_dev_get_nr_enroll_stages on the device, it returns 1: a single scan is enough to enroll a fingerprint. and indeed, I can scan my finger once and get back a fp_print_data struct (through the callback passed to fp_async_enroll_start). However, the old closed source drivers had a way to capture a set of 4 scans of the same finger (what they called an "enrollment", as opposed to a single-scan "capture") that were merged together to form a more robust, reliable view of the finger. Is there a way to mirror that functionality with libfprint, given that my device seems to use just 1 stage for an enrollment? The motivation here is that when someone registers their fingerprint, we want to make sure we've got a high quality scan on file, so that they can reliably match it later. Thanks in advance for your help. - Alan
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