Online signature verification using gripping position and power

This paper describes a new signer verification method using the pen-gripping position and the gripping power in writing. The gripping power is obtained by 31 mini-thin pressure sensors attached around the pen and the channel number of each sensor corresponds to the gripping position. The sensors are attached to the pen used in a pen-tablet system so both the gripping and the tablet data can be obtained simultaneously. The day to day change of gripping position is corrected by the shift of the gripping position. The characteristics of signers included in the gripping data are evaluated by signature verification experiments using gripping data and other writing data obtained from pen-tablet system. The result shows that the habits of signers are included in the gripping data like the other invisible tablet data, the pressure on the nib and the pen-tilt.