Cameras are used for acquiring online signature data. A camera can acquire not only pen tip trajectories, but also pen holding style. Therefore, we can use information associated with the pen holding style together with the pen tip trajectory for online signature verification. In the work described here, we used a silhouette of a skin region as a feature of pen holding style, and an averaged silhouette was used together with online signatures for verification. Preliminary experiments were performed using data collected from 22 subjects. The experimental results show that the accuracy was improved by combining the online signatures with silhouette-based pen holding style.
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