Device and method for verifying personal handwriting
First Claim
1. A device for verifying personal handwriting including a first body on which a piece of handwriting is written using a first writing instrument, said device comprising:
- means for detecting a time varying characteristic produced by the motion of said writing instrument on a surface of said body during the generation of said piece of handwriting,storage means for storing a time varying characteristic produced by the motion of a second writing instrument similar to said first writing instrument on a surface of a second body similar to said first body during the generation of at least one previous like piece of handwriting,means for comparing the detected time varying characteristic with the stored time varying characteristic to provide an indication of whether the generation of said handwriting pieces produce substantially common time varying characteristics and thus whether the handwriting pieces have been generated by a common author, the means for comparing the detected time varying characteristic with the stored time varying characteristic being arranged to compare each point of the detected time varying characteristic with a corresponding point of the stored time varying characteristic,means for producing a weighted average of the stored time varying characteristic and the detected time varying characteristic produced during the generation of a piece of handwriting by a common author, the producing means producing a weighted average of magnitudes of the stored time varying characteristic and the detected time varying characteristic as well as producing a weighted average of time of events of the stored time varying characteristic and the detected time varying characteristic, andmeans for replacing the stored time varying characteristic with the weighted average of the stored time varying characteristic and the detected time varying characteristic produced during the generation of a piece of handwriting by a common author.
1 Assignment
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Accused Products
Abstract
The stress wave activity produced in a surface by a writing instrument during the generation of a given piece of handwriting is detected by a transducer and is electrically processed. The stress wave activity is compared with a stress wave activity, produced during at least one previous generation of the given piece of handwriting, held in a store, by a processing unit in order to determine whether the detected and stored handwriting pieces have a common author. If the detected and stored handwriting pieces are determined to have a common author a weighted average of the stored stress wave activity and the detected stress wave activity is produced. The weighted average includes a weighted average of the amplitudes and a weighted average of times of events. This weighted average stress wave activity then replaces the stored stress wave activity in the store. This allows natural variations in the way an individual writes a given piece of handwriting to be accommodated without false indications of inauthenticity.
14 Citations
15 Claims
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1. A device for verifying personal handwriting including a first body on which a piece of handwriting is written using a first writing instrument, said device comprising:
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means for detecting a time varying characteristic produced by the motion of said writing instrument on a surface of said body during the generation of said piece of handwriting, storage means for storing a time varying characteristic produced by the motion of a second writing instrument similar to said first writing instrument on a surface of a second body similar to said first body during the generation of at least one previous like piece of handwriting, means for comparing the detected time varying characteristic with the stored time varying characteristic to provide an indication of whether the generation of said handwriting pieces produce substantially common time varying characteristics and thus whether the handwriting pieces have been generated by a common author, the means for comparing the detected time varying characteristic with the stored time varying characteristic being arranged to compare each point of the detected time varying characteristic with a corresponding point of the stored time varying characteristic, means for producing a weighted average of the stored time varying characteristic and the detected time varying characteristic produced during the generation of a piece of handwriting by a common author, the producing means producing a weighted average of magnitudes of the stored time varying characteristic and the detected time varying characteristic as well as producing a weighted average of time of events of the stored time varying characteristic and the detected time varying characteristic, and means for replacing the stored time varying characteristic with the weighted average of the stored time varying characteristic and the detected time varying characteristic produced during the generation of a piece of handwriting by a common author. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for verifying personal handwriting comprising the steps of:
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detecting a time varying characteristic produced by the motion of a writing instrument on a surface of a body during the generation of a given piece of handwriting, comparing the detected time varying characteristic with a stored time varying characteristic produced by the motion of a like writing instrument on a like surface of a like body during the generation of at least one previous piece of handwriting to provide an indication of whether the generation of said handwriting pieces produce common time varying characteristics and thus whether the pieces have been generated by a common author, comparing each point of the detected time varying characteristic with a corresponding point of the stored time varying characteristic, producing a weighted average of the stored time varying characteristic and the detected time varying characteristic produced during the generation of said handwriting by a common author, the producing step producing a weighted average of magnitudes of the stored time varying characteristic and the detected time varying characteristic and a weighted average of time of events of the stored time varying characteristic and the detected time varying characteristic, replacing the stored time varying characteristic with the weighted average of the stored time varying characteristic and the detected time varying characteristic produced during the generation of a piece of handwriting by a common author. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification