Analysis on the resolution of the different signals in an on-line handwritten signature verification system applied to portable devices

Nowadays, the use of portable devices with touch screens has reached an extended use among the population. With this technology, it is possible to incorporate to such devices the possibility of using handwritten signature to authenticate the user. In order to study the possibilities to carry on this authentication, a previous analysis has been carried out in this paper to evaluate how an already implemented on-line signature authentication algorithm will work in portable devices. Signature database signals have been re-scaled to emulate signals taken from a portable device, emulating two technologies, capacitive and resistive screens. For this, using only 3 of the 5 standard signals captured by graphic tablets: X, Y and P. Support Vector Machines have been used as an algorithm to test against the modified database, and results show good performance of the algorithms, obtaining rates around EER=3%, showing that the algorithms will give good results implemented in real smart phones.