Shape Recognition for Capacitive Touch Display

With the growing diffusion of touch screen based consumer devices the development of algorithms able to discriminate among the different shapes obtained by touching the device display becomes very important. For instance the detection and recognition of the fingers represents fundamental information in many touch based user applications. These algorithms are also extremely useful to recognize accidental touches in order to avoid involuntary activation of the device functionalities. Taking into account the aforementioned motivations, in this paper we present a technique able to classify the five most common classes of shapes acquired with a capacitive touch display: finger, ear, cheek, half ear half cheek and hand hold.