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Patent Agency Ranking
公开(公告)号：FR2413724B1
公开(公告)日：1986-05-30
申请号：FR7834443
申请日：1978-11-30
Applicant: IBM
Inventor： HERBST NOEL M , LIU CHAO N
Abstract: Method and apparatus are disclosed for verifying a sample signature based on comparison of the dynamics of a reference and a sample signature. More particularly, second derivative values of pen displacements (i.e. acceleration) and continuous pressure pattern signals are periodically sampled for both a reference and sample signature and a comparison of these second derivative values and pressure patterns is made. To effect the comparisons the two groups (reference and sample) of both second derivative and pressure pattern signals are segmented and corresponding segments are individually correlated. Successive comparisons of the same segment pairs are performed utilizing successive shifting of the phases between the two segments being correlated to find regions of highest possible correlation. A running account of the maximum cross correlation values for all of the segment pairs of the two signatures are kept. Finally, these maximum values obtained for each segment pair comparison are combined and this resultant correlation value is utilized as a verification indicator.
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公开(公告)号：CA1114189A
公开(公告)日：1981-12-15
申请号：CA325544
申请日：1979-04-11
Applicant: IBM
Inventor： HERBST NOEL M , LIU CHAO N , PANISSIDI HUGO A
Abstract: A pressure sensing device having applicability as a simple pressure sensor and which is particularly adapted for use as a pen in a Signature Verification System, said device including n unique mounting structure for the pressure sensing stylus by flexible support means mounted on a substantially rigid base. She support means has a pressure sensing element mounted thereon. She flexible support means comprises two spaced members so disposed that their deflections and the output of the pressure sensing element are substantially independent of the angle of pressure on the stylus. In the special purpose embodiment useful for Signature Verification the stylus comprises a pen and the device further includes two orthogonally disposed accelerometers for sensing accelerations of said pen during the writing of a signature.
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公开(公告)号：FR2413724A1
公开(公告)日：1979-07-27
申请号：FR7834443
申请日：1978-11-30
Applicant: IBM
Inventor： HERBST NOEL M , LIU CHAO N
Abstract: Method and apparatus are disclosed for verifying a sample signature based on comparison of the dynamics of a reference and a sample signature. More particularly, second derivative values of pen displacements (i.e. acceleration) and continuous pressure pattern signals are periodically sampled for both a reference and sample signature and a comparison of these second derivative values and pressure patterns is made. To effect the comparisons the two groups (reference and sample) of both second derivative and pressure pattern signals are segmented and corresponding segments are individually correlated. Successive comparisons of the same segment pairs are performed utilizing successive shifting of the phases between the two segments being correlated to find regions of highest possible correlation. A running account of the maximum cross correlation values for all of the segment pairs of the two signatures are kept. Finally, these maximum values obtained for each segment pair comparison are combined and this resultant correlation value is utilized as a verification indicator.
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4.发明专利
公开(公告)号：CA1103353A
公开(公告)日：1981-06-16
申请号：CA314675
申请日：1978-10-30
Applicant: IBM
Inventor： HERBST NOEL M , LIU CHAO N
Abstract: SIGNATURE VERIFICATION METHOD AND APPARATUS UTILIZING BOTH ACCELERATION AND PRESSURE CHARACTERISTICS of the Invention Method and apparatus are disclosed for verifying a sample signature based on comparison of the dynamics of a reference and a sample signature. More particularly, second derivative values of pen displacements (i.e. acceleration) and continuous pressure pattern signals are periodically sampled for both a reference and sample signature and a comparison of these second derivative values and pressure patterns is made. To effect the comparisons the two groups (reference and sample) of both second derivative and pressure pattern signals are segmented and corresponding segments are individually correlated. Successive comparisons of the same segment pairs are performed utilizing successive shifting of the phases between the two segments being correlated to find regions of highest possible correlation. A running account of the maximum cross correlation values for all of the segment pairs of the two signatures are kept. Finally, these maximum values obtained for each segment pair comparison are combined and this resultant correlation value is utilized as a verification indicator.
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公开(公告)号：FR2428830A1
公开(公告)日：1980-01-11
申请号：FR7911216
申请日：1979-04-26
Applicant: IBM
Inventor： HERBST NOEL M , LIU CHAO N , PANISSIDI HUGO A
IPC: B43K29/00 , G01L1/22 , G01L5/00 , G06F3/041 , G06K9/00 , G06K9/24 , G07C9/00 , G01L1/00 , G07C11/00
Abstract: A pressure sensing device having applicability as a simple pressure sensor and which is particularly adapted for use as a pen in a Signature Verification System, said device including a unique mounting structure for the pressure sensing stylus by flexible support means mounted on a substantially rigid base. The support means has a pressure sensing element mounted thereon. The flexible support means comprises two spaced members so disposed that their deflections and the output of the pressure sensing element are substantially independent of the angle of pressure on the stylus. In the special purpose embodiment useful for Signature Verification the stylus comprises a pen and the device further includes two orthogonally disposed accelerometers for sensing accelerations of said pen during the writing of a signature.
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