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US 5,479,531 AGranted
Apparatus and method for providing a weighted average of time varying characteristic of handwriting
AssigneeROLLS-ROYCE plc
InventorJohn R. Webster
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AssigneeROLLS-ROYCE plc
InventorJohn R. Webster
Estimating the term…
The stress wave activity produced during a first generation of a piece of handwriting in an enrollment procedure is put into a store and the stress wave activities produced for subsequent generations of the piece of handwriting in the enrollment procedure are used sequentially to produce a weighted average of the stored stress wave activity and the stress wave activity of the subsequent generation of the piece of handwriting and replaces the stored stress wave activity; the weighted average includes a weighted average of amplitudes and times of events. For subsequent generations of the piece of the handwriting are resequenced in order of increasing difference from the respective stored stress wave activity. The subsequent generations of the piece of handwriting are again used to sequentially produce weighted averages and replace the stored stress wave activity. The subsequent generations of the piece of handwriting are again resequenced in order of increasing difference from the respective stored stress wave activity. Each of the four subsequent generations of the piece of handwriting are used to produce weighted averages and replace the stored stress wave activity if the difference from the respective stored stress wave activity is less than a predetermined value.
A method of generating a weighted average of a time varying characteristic of handwriting of an individual in a handwriting verification process comprising the steps of 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, storing random noise or the time varying characteristic produced by the motion of the writing instrument on the surface of the body during a first generation of the piece of handwriting by an author at an enrollment procedure to produce a stored time varying characteristic A, sequentially producing a weighted average B of A and the time varying characteristic C produced by the motion of the writing instrument on the surface of the body during each one of a plurality of subsequent generations of the piece of handwriting by the author at said enrollment procedure and replacing A with B and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during the said one of the subsequent generations of the piece of handwriting by the author at the enrollment procedure, wherein sequentially producing a weighted average includes comparing A and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during each one of the plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure to give a measure of the difference, resequencing A of each of the plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure in order of increasing difference from the respective stored time varying characteristic A, sequentially producing a weighted average of A and the time varying characteristic produced by the motion of the writing instrument on the surface of the body for each of the resequenced plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure and replacing A with the average of A and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during said one subsequent generation of the piece of handwriting by the author at the enrollment procedure if the difference is less than a predetermined value to produce a better average of the time varying characteristics produced by the motion of the writing instrument on the surface of the body from the subsequent generations of the piece of handwriting by the author at the enrollment procedure in which, after resequencing the time varying characteristic of the plurality of subsequent generations of the piece of handwriting and before sequentially producing and storing the weighted average of A and B produced by the motion of the writing instrument on the surface of the body for each one of the subsequent generations of the handwriting piece if the difference is less than a predetermined value, sequentially producing another weighted average D of the stored time varying characteristic and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during each one of the plurality of subsequent generations of the piece of handwriting by the author at said enrollment procedure and replacing the stored time varying characteristic with D, resequencing the time varying characteristic of each of the plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure in order of increasing difference from the respective stored time varying characteristic to provide a reference average of a time varying characteristic of handwriting for use in a handwriting verification process.
An apparatus (10) for generation of a weighted average of a time varying characteristic of handwriting of an individual in a handwriting verification process comprising means (16) for detecting a time varying characteristic produced by the motion of a writing instrument (13) on a surface of a body (12) during the generation of a given piece of handwriting, means (26) for storing random noise or the time varying characteristic produced by the motion of the writing instrument (13) on the surface of the body (12) during the first generation of the piece of handwriting by an author at an enrollment procedure to produce a stored time varying characteristic A, means (24) for sequentially producing a weighted average B of A and the time varying characteristic C produced by the motion of the writing instrument on the surface of the body during each one of a plurality of subsequent generations of the piece of handwriting by the author at said enrollment procedure and for replacing A with B and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during the said one of the subsequent generations of the piece of handwriting by the author at the enrollment procedure, characterised in that the means (24) for sequentially producing a weighted average includes means for comparing A and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during each one of the plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure to give a measure of the difference, means (24) for resequencing the time varying characteristic of each of the plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure in order of increasing difference from the respective stored time varying characteristic, second means (24) for sequentially producing another weighted average of the stored time varying characteristic and the time varying characteristic produced by the motion of the writing instrument on the surface of the body for each of the resequenced plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure and replacing the stored time varying characteristic with the average of the stored time varying characteristic and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during said one subsequent generation of the piece of handwriting by the author at the enrollment procedure if the difference is less than a predetermined value to produce an average D of the time varying characteristic produced by the motion of the writing instrument on the surface of the body from the subsequent generations of the piece of handwriting by the author at the enrollment procedure in which the apparatus comprises third means (24) for sequentially producing a weighted average of the stored time varying characteristic and the time varying characteristic produced by the motion of the writing instrument on the surface of the body for each one of the plurality of subsequent generations of the piece of handwriting by the author at said enrollment procedure resequenced by the means for resequencing the time varying characteristic of the plurality of subsequent generation of the piece of handwriting and replacing A with the weighted average of A and the time varying characteristic produced by the motion of the writing instrument on the surface of the body during the said one of the subsequent generations of the piece of handwriting by the author at the enrollment procedure, second means (24) for resequencing the time varying characteristic of each of the plurality of subsequent generations of the piece of handwriting by the author at the enrollment procedure in order of increasing difference from the respective stored time varying characteristic to produce a reference average of a time varying characteristic of handwriting for use in handwriting verification process.
Dependencies are inferred from the claim text.