Image analysis – Applications – Personnel identification
Patent
1998-10-13
2000-11-14
Mehta, Bhavesh
Image analysis
Applications
Personnel identification
178 1801, G06K 900
Patent
active
061480932
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for registration, analysis and validation of a hand-written personal signature. The invention also relates to methods for compilation of a database MDB with authenticated hand-written personal signatures which are used for validation of the authenticity of newly registered corresponding personal signatures, wherein a registration of a signature is executed a repeated number of times on a writing surface substantially defined in an x, y plane by means of a writing device which at one end has provided a writing tip for contact with said writing surface and further comprises a multi-axis movement detector, wherein the registration comprises steps for detecting the movement of said writing device as a function of time and with six degrees of freedom. Said six degrees of freedom being given by a linear movement along an x axis, a y axis and a z axis respectively as well as by rotation about said x axis, said y axis and said z axis respectively, generating on the basis of the detected movement of said writing device respectively a first data stream D1 for the movement for said writing device with only two degrees of freedom as a function of time (2-dimensional tracking). These two degrees of freedoms being given by the linear movement along said x axis and the linear movement along said y axis. A second data stream D2 for the movement of said writing device with all six degrees of freedom as functions of time (6-dimensional tracking). A third data stream D3 for the contact of said writing device with said writing surface, at said writing tip, as a function of time, and a fourth data stream D4 for a clock function. The clock function provides a time scale whereto the detection of the movement and the three first data streams D1, D2, D3 are referred, and transmitting sad data streams D1, D2, D3, D4 to a data processing device connected with said writing device. Further the invention relates to a method for validation of a hand-written signature wherein a method according to claim 1 is used for registration of the signature, the detection of the movement of a writing device and generation of a first data stream D1 for the movement of said writing device with two degrees of freedom, a second data stream D2 for the movement of the writing device with six degrees of freedom, a third data stream D3 for the contact of said writing device with a writing surface and a fourth data stream D4 for a clock function, wherein said data streams D1, D2, D3 and D4 are delivered as input data to a data processing device, wherein said data processing device contains a main database MDB for storage of registered signatures in predetermined data formats and compiled according to claims 5 or 6 and wherein the validation takes place by comparing a newly registered personal signature with a representation of an authorised personal signature already stored in said database MDB in database files DF-A, DF-B, DF-C and DF-D. Finally, the invention relates to an electronic writing device, particularly an electronic pen for use as stated above, wherein the writing device at a first end has provided a writing tip for writing on a writing surface.
DESCRIPTION OF THE RELATED ART
In the prior art there are known methods for verification and validation of personal hand-written signatures by using for instance pattern recognition in two dimensions. Such 2-dimensional validation methods for personal signatures have, however, an uncertainty which among others is determined by the fact that the pattern a personal signature forms in two dimensions will vary each time the signature is written and this uncertainty is sufficiently large that the validation method based on 2-dimensional pattern recognition not always with certainty may decide whether a genuine or forged signature is present. An accomplished forger will as a rule be able to imitate the signature pattern in two dimensions, such that possible deviations will fall within the tolerance of the validation and the forgery hence not be expos
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Leistad Geirr I.
McConnell Gary A.
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