The sensor forms an image and OpenCV detects the actual touch configuration. It appears you can use the raw data from the Arduino, too, but it might be a little harder.

Some of us might never know the touch of another human, but this project in the Hackaday Prize might just be the solution. It’s TouchYou, [Leonardo]’s idea for a wearable device that al… ...

The Touch Board is based around an Arduino Leonardo board that also sports an MP3 player / MIDI device, a MicroSD card socket, 3.5 mm audio jack and what Johnson described as the "secret sauce ...