MagiText: Around device magnetic interaction for 3D space text entry in smartphone

This paper presents MagiText that expands the text entry space beyond physical boundaries of a device, to overcome the problems of touch screen input. This approach uses the mobile phone´s inbuilt magnetometer sensor to recognize 3D space handwritten character gestures. The key idea is to influence the magnetic sensor by writing character gestures (i.e. Graffiti or EdgeWrite) in front of the device using a properly shaped magnet taken in hand. The movement of this magnet changes the magnetic flux pattern around the device and it is sensed and registered by the magnetometer sensor. Then, we classify this flux pattern using Support Vector Machine (i.e. SVM) classifier. The experimental result shows that our prototype can achieve 81:2% accuracy with Graffiti, whereas EdgeWrite provides 89:4% accuracy.