When most people saw the concept video from Aatma Studios which showed an iPhone with a holographic keyboard, they sighed with longing. Florian Kräutli, on the other hand, was inspired to come up with his own virtual keyboard app for the iPhone. His app, which he named Vibrative, runs on jailbroken iPhones and is really more of a work in progress than an app which could could be sold in iTunes.
Rather than use the camera or some other visual sensor to track finger movements, Florian instead uses the iPhone accelerometer to detect the minute vibrations caused by typing on a surface.
Here’s more from The Telegraph:
The system, dubbed Vibrative, uses the three-dimensional accelerometer in Apple’s smartphone to measure the characteristics of each tap on the table, such as the strength and frequency of the vibrations it causes, and compares them to “training data” to work out its approximate location.
The location is converted into a key press on the “virtual keyboard”. Currently, the system determines the intended key correctly about 80 per cent of the time, so the data is also fed into an auto correct dictionary to ensure the words are spelled correctly.
via The Telegraph