Think dual camera phones are overkill? How about this bump-less quad camera by the institute that invented .MP3s?11
Smartphone manufacturers have found ways to deal with unsightly camera bumps, but the means to do so don't really allow for large, technologically ambitious camera sensors. The ever-diligent Fraunhofer Institute, to whom we owe the .MP3 format among other things, has worked to sidestep this trade-off.
The current prototype uses a whopping four image sensors, rotated 90 degrees so they point out of the side of the phone. Meanwhile, a set of tiny mirrors in front of the sensors reflects the image from the front or rear of the phone. It may seem a bit crammed in there, but there's good reasoning behind the design (duh, it's Fraunhofer!).
The prototype captures pictures at a 20MP resolution, which is satisfying considering the number of sensors at work. It benefits from auto-focus and optical image stabilization, too. Alas, selling this module to smartphone makers as-is could prove problematic. It's very different to what's currently in use, it requires unorthodox engineering, and it's probably as power-hungry as four cameras firing at once can be.
source: PC World