The Design of Digital Handwriting Forces Vector Ink and its Application in Online Signature Verification

The use of pen as an effective communication interface to computer becomes an active research area in recent years. However, the lack of complete solutions for interchange between platforms has hampered its application as no efficient device can record the entire procedure of human handwriting behavior. In this paper, we design a force Tablet (F-Tablet) for human-computer-interaction (HCI), which can acquire the kinematics and kinetics information of human handwriting, including strokes of pen-up and pen-down, pen nib trajectory and three-axis forces of pen tip directly and simultaneously. Any stylus- and pen-like device can be used to write on it. The core part of the system, named as F-Tablet, is introduced and its ink was defined according to InkML format. An improved DTW (dynamic time warping) algorithm is also put forward to verify the online signatures based on the digital handwriting forces vector ink. The iterative experiment is introduced to decide weights for writing forces in different direction and the classification threshold