IMPROVEMENTS IN METHODS AND APPARATUS FOR SIGNATURE VERIFICATION
专利汇可以提供IMPROVEMENTS IN METHODS AND APPARATUS FOR SIGNATURE VERIFICATION专利检索，专利查询，专利分析的服务。并且A signature to be verified is written on an area (13) which carries horizontal and vertical lines using a pen (10). As the lines are crossed signals representative of the vertical and horizontal components of the pen tip velocity and whether the tip is in contact with the area are passed to a computer (11). A hidden Markov model derived from vertical and horizontal velocities and a ''contact'' signal occurring as a number of authentic signatures are written is stored by the computer. A forward pass of the forward-backward algorithm is used to calculate the probability that the vertical and horizontal components of the pen tip and the contacts between pen tip and the area (13) could have been produced from the hidden Markov model. This probability is used to decide whether the signature is authentic. The hidden Markov model stored by the computer is derived from an initial model based on pen tip velocities and contacts occurring in an authentic signature, and re-estimation carried out using forward and backward passes of the forward-backward algorithm and velocities and contacts from further authentic signatures.，下面是IMPROVEMENTS IN METHODS AND APPARATUS FOR SIGNATURE VERIFICATION专利的具体信息内容。
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