Authentication system
First Claim
1. An authentication system comprising:
- direction measuring means for measuring, in a time domain, the direction vector of a pen represented by a tilt angle or direction angle of the pen with respect to a writing surface;
first vector generating means for generating, in a time domain, a first vector including, as a component thereof, the direction vector of the pen measured by said direction measuring means when a first entity writes a predetermined pattern on the writing surface with the pen;
second vector generating means for generating, in a time domain, a second vector including, as a component thereof, the direction vector of the pen measured by said direction measuring means when a second entity writes said predetermined pattern on the writing surface with the pen;
DP matching means for performing a DP matching process to match time scales of the first and second vectors in order to minimize an accumulated value of differences between the first vector generated by said first vector generating means and the second vector generated by said second vector generating means, said differences including differences between the direction vector included in said first vector and the direction vector included in said second vector; and
decision means for determining that said first entity and said second entity are identical to each other if the accumulated value of differences between the first vector and the second vector in said DP matching process performed by said DP matching means is equal to or smaller than a predetermined threshold, and determining that said first entity and said second entity are different from each other if said accumulated value is greater than said predetermined threshold.
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Abstract
An authentication system has a direction measuring unit which measures, in a time domain, the direction vector of a pen with respect to a tablet. First and second vector generating units generate, in a time domain, first and second vectors including, as components thereof, the direction vector of the pen when first and second entities write a predetermined pattern on the tablet with the pen. A DP matching unit performs a DP matching process to match time scales of the first and second vectors in order to minimize an accumulated value of differences between the first and second vectors, the differences including differences between the direction vector included in the first vector and the direction vector included in the second vector. A decision unit determines that the first entity and the second entity are identical to or different from each other based on whether the accumulated value of differences between the first vector and the second vector in the DP matching process less or greater than a predetermined threshold.
53 Citations
8 Claims
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1. An authentication system comprising:
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direction measuring means for measuring, in a time domain, the direction vector of a pen represented by a tilt angle or direction angle of the pen with respect to a writing surface;
first vector generating means for generating, in a time domain, a first vector including, as a component thereof, the direction vector of the pen measured by said direction measuring means when a first entity writes a predetermined pattern on the writing surface with the pen;
second vector generating means for generating, in a time domain, a second vector including, as a component thereof, the direction vector of the pen measured by said direction measuring means when a second entity writes said predetermined pattern on the writing surface with the pen;
DP matching means for performing a DP matching process to match time scales of the first and second vectors in order to minimize an accumulated value of differences between the first vector generated by said first vector generating means and the second vector generated by said second vector generating means, said differences including differences between the direction vector included in said first vector and the direction vector included in said second vector; and
decision means for determining that said first entity and said second entity are identical to each other if the accumulated value of differences between the first vector and the second vector in said DP matching process performed by said DP matching means is equal to or smaller than a predetermined threshold, and determining that said first entity and said second entity are different from each other if said accumulated value is greater than said predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification