Multi touch shape recognition for projected capacitive touch screen

Devices equipped by touch screens are nowadays widely diffused. One of the most meaningful factor which leads to this success is their easy and intuitive interface which allows a friendly user-device interaction. Touch shape recognition is a topic which has contributed to the realization of these types of interfaces. In this paper we propose a solution able to discriminate among different classes of touch shapes. We focus on the problem of recognizing typical touches performed in mid-sized devices as tablets and phablets. The proposed solution discriminates among single finger, multiple fingers and palm by reaching high recognition accuracy and maintaining a low computational complexity.