Continuous authentication with touchscreens using fingerprints is a uniquely challenging prospect. Essentially, both input and output have to happen in real-time, with the input happening transparently. Fiberio is a rear-projected multi-touch tabletop system addressing this issue. Holz and Baudisch outline their solution in this paper. Going through the paper, it is clear that the proof of concept to address the challenge of supporting specular and diffuse requirements has been demonstrated. A tabletop touchscreen was assembled using a camera, a projector, an illuminator, and a fiber optic plate. While the creative solution is very interesting, several questions remain to be answered. For example, what if more than one finger is on the screen? At present, it has been tested with just ten unique users. The time needed to authenticate increases with the number of fingerprints in the biometric database. This would result in loss of real-time usefulness for most applications. The system is also relatively bulky. However, one would expect the authors to continue their efforts and address the limitations. This is an interesting product to watch.
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