Signature verification system
First Claim
Patent Images
1. A signature verification system including:
- a) an encoding apparatus comprising means for illuminating a predetermined area on a carrier medium where at least a portion of a sample signature would be expected to be, means for scanning said predetermined area to produce signals representing the sample signature, means for processing said signals to produce a black and white pixel representation of the sample signature within the predetermined area, means for analysing the black and white pixel representation and evaluating the number of pixels which satisfy criteria associated with each of a plurality of preselected features of the sample signature, said preselected features including a ratio of numbers of pixels in the black and white pixel representation satisfying different criteria, means for scaling each of said numbers of pixels to produce a measure value for each of said plurality of preselected features, and means for producing a set of reference measure values representative of at least one sample signature from the measure values produced representative of at least one sample signature; and
b) verification apparatus comprising means for illuminating a predetermined area on a further carrier medium where at least a portion of an offered signature would be expected to be, means for scanning said predetermined area to produce signals representing the offered signature, means for processing said signals to produce a black and white pixel representation of the offered signature within the predetermined area, means for analysing the black and white pixel representation and evaluating the numbers of pixels which satisfy criteria associated with each of said plurality of preselected features of the offered signature, said preselected features including a ratio of numbers of pixels in the black and white pixel representation satisfying different criteria, means for scaling each of said numbers of pixels to produce a measure value for each of said plurality of preselected features the measure values forming a set which is representative of the offered signature, means for comparing the set of reference measure values for the at least one sample signature with the set of measure values for the offered signature and indicating the result of the comparison.
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Abstract
A system of dissecting a signature by light analysis to produce component digital representations that are processed to a resultant standard signal representing a sample signature. Verification apparatus reduces a test signature to an equivalent signal for comparison with the standard.
157 Citations
12 Claims
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1. A signature verification system including:
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a) an encoding apparatus comprising means for illuminating a predetermined area on a carrier medium where at least a portion of a sample signature would be expected to be, means for scanning said predetermined area to produce signals representing the sample signature, means for processing said signals to produce a black and white pixel representation of the sample signature within the predetermined area, means for analysing the black and white pixel representation and evaluating the number of pixels which satisfy criteria associated with each of a plurality of preselected features of the sample signature, said preselected features including a ratio of numbers of pixels in the black and white pixel representation satisfying different criteria, means for scaling each of said numbers of pixels to produce a measure value for each of said plurality of preselected features, and means for producing a set of reference measure values representative of at least one sample signature from the measure values produced representative of at least one sample signature; and b) verification apparatus comprising means for illuminating a predetermined area on a further carrier medium where at least a portion of an offered signature would be expected to be, means for scanning said predetermined area to produce signals representing the offered signature, means for processing said signals to produce a black and white pixel representation of the offered signature within the predetermined area, means for analysing the black and white pixel representation and evaluating the numbers of pixels which satisfy criteria associated with each of said plurality of preselected features of the offered signature, said preselected features including a ratio of numbers of pixels in the black and white pixel representation satisfying different criteria, means for scaling each of said numbers of pixels to produce a measure value for each of said plurality of preselected features the measure values forming a set which is representative of the offered signature, means for comparing the set of reference measure values for the at least one sample signature with the set of measure values for the offered signature and indicating the result of the comparison. - View Dependent Claims (2, 3, 4, 5)
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- 6. A signature verification apparatus for use with a carrier medium bearing an offered signature for comparison with a code, said apparatus comprising means for illuminating a predetermined area on the carrier medium where at least a portion of an offered signature would be expected to be, means for scanning said predetermined area to produce signals representing the offered signature, means for processing said signals to produce a black and white pixel representation of the offered signature within the predetermined area, means for analysing the black and white pixel representation and evaluating numbers of pixels which satisfy criteria associated with each of a plurality of preselected features of the offered signature, said preselected features including a ratio of numbers of pixels in the black and white pixel representation satisfying different criteria, means for scaling each of said numbers of pixels to produce a measure value for each of said plurality of preselected features the measure values forming a set which is representative of the offered signature, means for inputting a code indicative of a true signature, means for producing a set of measure values representing the true signature from the inputting means, and means for comparing the set of measure values for the true signature with the set of measure values for the offered signature and indicating the result of the comparison.
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12. A system verification apparatus for use with a record medium bearing an offered signature to be tested against a code, the apparatus comprising:
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means for illuminating said offered signature as on said record medium; means for scanning said offered signature as illuminated to produce a black and white pixel representation of that signature; means for feature analysing the pixel representation to produce digital signals representative of plural features of said signature including a ratio of numbers of pixels in the black and white pixel representation satisfying different criteria; means for combining said signals representative of plural features to provide a resultant signal representing said offered signature; and means for comparing said resultant signal with said code to provide a verification indication.
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Specification