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公开(公告)号：CA2225850A1
公开(公告)日：1998-06-27
申请号：CA2225850
申请日：1997-12-23
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: To provide an apparatus for pre-selecting fingerprint cards having certain similarity to an S-card to be identified, at a high-speed, among a plurality of F-cards, an apparatus of the invention comprises: an F-side cluster index determination section (2) for designating a cluster wherein feature data of the plurality of F-cards are to be classified according to features extracted from the plurality of F-cards; an F-card feature storing section (3) for storing the feature data of the plurality of F-cards in the cluster designated by the F-side cluster index determination section (2); an S-card feature storing section (5) for temporarily storing feature data of the S-card; an S-side cluster index determination section (6) for designating clusters to be retrieved according to a combination of features extracted from the S-card; and a fingerprint card matching discrimination unit (8) for pre-selecting the fingerprint cards by comparing the feature data of the S-card with the feature data of the plurality of F-cards stored the clusters designated by the S-side cluster determination section (6).
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公开(公告)号：CA2333864C
公开(公告)日：2005-06-28
申请号：CA2333864
申请日：2001-02-01
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A biometric identification system ensuring reliable and protective identification of individuals even in a system having a biometric input device and a biometric verifier are separately provided is disclosed. The biometric data input device has a biometric data sensor and an encoder that encodes digital biometric data using secret information identifying the biometric data input device to transmit encoded data to the biometric verifier. The biometric verifier decodes the encoded data using the secret information to reproduce digital biometric data. The identity of the individual is verified when the digital biometric data is a registered biometric feature of an authorized user and the biometric data input device is an authorized device.
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公开(公告)号：GB2357175B
公开(公告)日：2004-03-03
申请号：GB0030061
申请日：2000-12-08
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A user authentication apparatus is disclosed by which, even where biometrics input data of some user such as a fingerprint are low in quality and are not suitable for verification, the security of the entire system can be augmented without giving rise to increase of the cost by introduction of significant additional hardware. When a fingerprint verifying characteristic extraction section discriminates that the quality of an image of a fingerprint is insufficient or when authentication based on an inputted fingerprint by a user verification result determination section results in failure, a request to input a fingerprint is issued from a fingerprint inputting request section to the user. When necessary fingerprint inputting is performed from a fingerprint inputting section, substitute authentication by a substitute authentication section is permitted. A result of the substitute authentication by the substitute authentication section is displayed on a service permission or rejection display section. The image inputted from a fingerprint inputting section or the fingerprint inputting section is stored into a substitute authentication means user information storage section.
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公开(公告)号：DE69623564D1
公开(公告)日：2002-10-17
申请号：DE69623564
申请日：1996-10-31
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: In order to extract position and direction of the first joint line of a fingerprint for stable pattern positioning in fingerprint comparison, an apparatus for extracting fingerprint features comprises a vertical strip divider (11) for dividing digitized data of a fingerprint into data of a plurality of strips with straight lines parallel to a y direction; a projection calculator (12) for obtaining histograms, each of said histograms calculated by accumulating pixel values of each of said plurality of strips in an x direction perpendicular to said y direction; a valley candidate calculator (13) for detecting candidate valleys from said histograms, one of said histograms having a locally minimum value at each of said candidate valleys; and a valley information integrator (116) for calculating a position of a joint line of said fingerprint from positional information of said candidate valleys detected by said valley candidate calculator (13).
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公开(公告)号：GB2348309B
公开(公告)日：2002-10-09
申请号：GB0007102
申请日：2000-03-23
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: An authentication method using biometrics identification, comprising the following steps of: identifying a user by biometrics entered from a portable authentication terminal; when the user has been registered previously, establishing communication between the authentication terminal and an authentication executing device independent of the authentication terminal, and calculating a common secret key for use in transmission of an authentication message; encrypting an authentication message including the user's inherent information in the authentication terminal based on the secret key; sending the encrypted authentication message from the authentication terminal to the authentication executing device; and decrypting the authentication message in the authentication executing device based on the calculated secret key, thereby executing an operation depending on the user. inherent information included in the message.
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Patent Agency Ranking
公开(公告)号：CA2333864A1
公开(公告)日：2001-08-03
申请号：CA2333864
申请日：2001-02-01
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A biometric identification system ensuring reliable and protective identification of individuals even in a system having a biometric input device and a biometric verifier are separately provided is disclosed. The biometric data input device has a biometric data sensor and an encoder that encodes digital biometric data using secret information identifying the biometric data input device to transmit encoded data to the biometric verifier . The biometric verifier decodes the encoded data using the secret information to reproduce digital biometric data. The identity of the individual is verified when the digital biometric data is a registered biometric feature of an authorized user and the biometric data input device is an authorized device.
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公开(公告)号：AU722613B2
公开(公告)日：2000-08-10
申请号：AU7540996
申请日：1996-12-17
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A fingerprint characteristic extraction apparatus uses, in addition to characteristic amounts used in ordinary preselection processing, a novel characteristic amount obtained from a fingerprint image for the preselection processing. The fingerprint characteristic extraction apparatus includes a ridge extraction section (12) for extracting ridges from an inputted fingerprint image, a singular point detection section (13) for detecting singular points from the ridges, a main pattern discrimination section (14) for discriminating a pattern from the ridges and the singular points, and a singular point characteristic calculation section (15) for detecting characteristic amounts between the singular points from the ridges, the singular points and the pattern. The fingerprint characteristic extraction apparatus further includes a joint line extraction section (11) for extracting a joint line from the inputted fingerprint image, and a joint line characteristic calculation section (16) for calculating joint line singular point characteristic amounts from the joint lines, the ridges and the singular points.
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公开(公告)号：CA2244034A1
公开(公告)日：1999-01-28
申请号：CA2244034
申请日：1998-07-28
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: An original image is held in the image holder 11, and displayed on the image display 12 to be viewed by the operator. The operator inputs the angle of rotation and ratio of compression of an focal point of the original image for observing ridges more clearly. A perspective transforming unit 14 generates a result image according to corresponding perspective transformation (i.e., affine transformations), and a perspective transformed image display 15 displays the result image to the user. The operator does operations of manual plotting and manual tracing with reference to the result image. The result of the operations is inputted to and recorded in the manual input unit 16, and transformed in a feature data transforming unit 17 to feature data.
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公开(公告)号：CA2189671A1
公开(公告)日：1997-05-09
申请号：CA2189671
申请日：1996-11-05
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: In order to extract position and direction of the first joint line of a fingerprint for stable pattern positioning in fingerprint comparison, an apparatus for extracting fingerprint features comprises a vertical strip divider (11) for dividing digitized data of a fingerprint into data of a plurality of strips with straight lines parallel to a y direction; a projection calculator (12) for obtaining histograms, each of said histograms calculated by accumulating pixel values of each of said plurality of strips in an x direction perpendicular to said y direction; a valley candidate calculator (13) for detecting candidate valleys from said histograms, one of said histograms having a locally minimum value at each of said candidate valleys; and a valley information integrator (116) for calculating a position of a joint line of said fingerprint from positional information of said candidate valleys detected by said valley candidate calculator (13).
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公开(公告)号：CA2187842A1
公开(公告)日：1997-04-17
申请号：CA2187842
申请日：1996-10-15
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A tenprint selector comprises a fingerprint pattern level feature difference calculating unit (12) which receives and compares a set of candidates for pattern level feature types of fingerprint images shown on file cards and a set of candidates for pattern level feature types of fingerprint images shown on a search card and calculates a pattern level feature difference, a card difference calculating unit (13) which calculates a card difference based on the pattern level feature difference of the fingerprint images of all fingers shown on the file cards and the search card, and a judging unit (14) which compares the card difference determined by the card difference calculating means with a predetermined card difference threshold value and judges, whether the file card shall be selected to be further checked with the search card.
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