On-line signature evaluation based on shape feature

Signature evaluation is a method to determine individual signature whether that is good or bad. A good signature is more complex and difficult to impersonate, besides a bad signature are easy to recognition and easy to impersonate. If a signature have a lot of angle, that is means the signature is more complex, so we calculate the internal angle quantity to determine that is a good or bad signature. There are too many angle in a signature, contain big angle or small angle. In this paper, we using geometry to decide what kind of angle that we want to determine.