Wow, a research project that uses Ultrasound to scan fingerprints in 3D? This would be amazing if Qualcomm didn't have a near production version (Likely showing up in phones early next year around CES) that they were showing off at MWC months ago. I played with it here, it works, it does '3D', it scans beneath the surface, it is ultrasound based, etc etc. It also does other neat tricks that they aren't making public.
So why is this 'new' one all the rage again?