Image analysis – Applications – Personnel identification
Patent
1993-12-10
1995-12-26
Mancuso, Joseph
Image analysis
Applications
Personnel identification
382187, G06K 900
Patent
active
054795311
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus and method for verifying personal handwriting.
BACKGROUND OF THE INVENTION
It is known from British Patent No. 2159998B to detect and store a time varying characteristic, e.g. the stress wave activity produced in a body by a writing instrument during the generation of a given piece of handwriting. The time varying characteristic, e.g. the stress wave activity, produced by a subsequent generation of the given piece of handwriting is compared with that produced by the stored piece of handwriting in order to determine whether the stored and subsequent handwriting pieces have a common author.
In our copending European Patent Application No. 90313505.1, filed on 12 Dec. 1990, if it is determined that the subsequent and stored time varying characteristic produced during the generation of the handwriting pieces have a common author, a weighted average of the stored time varying characteristic and the subsequent time varying characteristic is produced. The stored time varying characteristic is then replaced by the weighted average of the stored time varying characteristic and the subsequent time varying characteristic produced during the generation of a piece of handwriting by a common author. The weighted average is a weighted average of the magnitudes of the time varying characteristic between the stored time varying characteristic and the time distorted subsequent time varying characteristic and is a weighted average of the time of events.
In this procedure it is necessary that the stored time varying characteristic is either produced from a single sample piece of handwriting of the author generated during an enrollment procedure, or is an average produced from a number of sample pieces of handwriting of the author generated during an enrollment procedure.
A problem associated with the production of the stored time varying characteristic is that the single sample piece of handwriting of the author, or one or more of the number of sample pieces of handwriting of the author, is often not a typical piece of handwriting of the author. This is often because the author is not relaxed during the enrollment procedure, or is because the author is not used to writing or for other reasons. If the time varying characteristic produced from the untypical sample of the piece of handwriting, or untypical samples of the piece of handwriting, is stored and subsequently compared to the time varying characteristic produced by an authentic piece of handwriting it is possible that the authentic piece of handwriting will be determined to be generated by a person other than the author of the stored time varying characteristic, i.e the piece of handwriting will be determined to be a forgery.
SUMMARY OF THE INVENTION
The present invention seeks to provide a novel apparatus and method for verifying personal handwriting which overcomes the above problem.
Accordingly the present invention provides a method of verifying personal handwriting 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, 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 during each one of a plurality of subsequent generations of the piece of handwriting by the author at said enrollment procedure and replacing the stored time varying characteristic with the 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 during the said one of t
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IBM Technical Disclosure Bulletin, vol. 17, No. 12, May 1975 New York US pp. 3758-3760; Evangelisti: `Identification System` see p. 3760, Line 26, Line 30.
Proc. Of The 6th Int. Conf. On Pattern Recognition vol. 2, 19 Oct. 1982, Munich, DEX. pp. 823-825; Sato E. A.: "Online Signature Verification Based on Shape, Motion, and Writing Pressure", see p. 824, col. 1, Line 19-col. 2, Line 37; see p. 825, col. 1, Line 15-32 see figures.
Mancuso Joseph
Rolls-Royce plc
Shalwala Bipin
LandOfFree
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