Fiberio: A Touchscreen That Senses Fingerprints

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Fiberio A Touchscreen that Senses Fingerprints Fiberio Christian Holz Patrick Baudisch Hasso Plattner Institute A Touchscreen that Senses Fingerprints related work user identification on multitouch systems 1998: The Vision [Sugiura & Koseki, UIST ’98] fingerprint ➭ user’s identity, functionality DiamondTouch [Dietz & Leigh, UIST ’01] 1. the first integrated system—distinguish users Medusa ...without the seats [Annett et al., UIST ’11] SurfaceFusion 2. true identification using tokens [Olwal & Wilson, CHI ’08] IR Ring [Roth et al., UIST ’10] still a token, but sensed by the table itself HandsDown 3. biometric features [Schmidt et al., NordiCHI ’10] BootStrapper [Richter et al., CHI ’12] pseudo-biometric: recognize clothing Carpus features on the back of the hand [Ramakers et al., UIST ’12] [Holz & Baudisch, CHI ’10] Ridgepad fingerprint ➭ 3D finger pose ➭ touch accuracy proposed functionality 1. different functions per finger 2. personalize interaction 3. log user activity 4. high-accuracy touch 5. authenticated access to private data the challenge challenge output project images 1 input 2 capture fingerprints challenge output project images 1 input 2 capture fingerprints ...integrated into the same space? 1project images diffuse surface 2capture fingerprints specular surface 2capture fingerprints on traditional fingerprint scanners camera light source 2capture fingerprints fingerprint ridge air glass 2capture fingerprints fingerprint ridge appears bright 2capture fingerprints fingerprint ridge skin appears bright glass 2capture fingerprints fingerprint ridge appears bright appears dark 2capture fingerprints fingerprint scanner := (1) high resolution (of course) (2) generate contrast between ridges and valleys challenge output project images 1 input 2 capture fingerprints ...integrated into the same space? Fiberio fiber optic plate fiber optic plate fiber optic plate 40,000,000 fibers (3mm long) 4333 dpi off-the-shelf role of the fiber plate (1) project images: diffuse transmission (2) capture fingerprints: specular reflection 1project images 1project images 1ring diffusion 1ring diffusion 2capture fingerprints fiber optic plate camera illuminant specular reflection specular reflection technical details placing the illuminant placing the illuminant fiber plate hotspot camera illuminant placing the illuminant camera illuminant 1same location and tilted camera and illuminant 1same location 1same location 1same location light intensity and reflections high low 2homogenous illuminant fiber plate area illuminant 2homogenous illuminant processing pipeline raw image locate fingerprints augment & extract features match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users query user #1 [Bozorth ’04] user #2 user #3 raw image locate fingerprints augment find orientations enhance ridges binarize mask extract features skeleton find minutiae match users “christian holz” fingerprint user evaluation 30 fingers 10 participants × 3 fingers × 5 touches 150 trials results 148 correct matches 0 wrong matches 2 no matches 21ms feature extraction 0.55ms matching per entry conclusions Fiberio ...a diffused illumination table at heart fiber optic plate 1998 2013 Fiberio Fiberio A Touchscreen that Senses Fingerprints Christian Holz Patrick Baudisch Hasso Plattner Institute http://www.christianholz.net Fiberio A Touchscreen that Senses Fingerprints