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公开(公告)号：DE60306285T2
公开(公告)日：2006-11-09
申请号：DE60306285
申请日：2003-09-26
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A fingerprint authentication device comprises input finger characteristic judging portion 13. The input finger characteristic judging portion 13 judges whether the input data is proper or not on the basis of spatial frequency analysis of an fingerprint image represented by the input data. An observation area deciding portion decides an observation area on the fingerprint image. A frequency analyzing portion 132 transforms image of the observation area into a Fourier transformed image. The frequency analyzing portion 132 further calculates averages and dispersion of strength values corresponding to predetermined spatial frequency bands. A discriminative value calculating portion calculates discriminative values by the use of the averages and the dispersion . A deciding portion decides whether the input image is proper or not by the use of the discriminative values together with discriminative coefficient preliminary calculated.
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公开(公告)号：DE60302965D1
公开(公告)日：2006-02-02
申请号：DE60302965
申请日：2003-09-26
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: A fingerprint authentication device comprises input finger characteristic judging portion 13. The input finger characteristic judging portion 13 judges whether the input data is proper or not on the basis of spatial distribution of brightness in an fingerprint image represented by the input data. An observation line deciding portion decides an observation line on the fingerprint image. A peak envelope calculating portion graphs the brightness against positions on the observation line and draws envelopes of line graphs each of which links local maximums or local minimums of the brightness. A discriminative value calculating portion calculates discriminative values by the use of a brightness distribution function and peak envelop functions. A deciding portion decides whether the input image is proper or not by the use of the discriminative values together with the discriminative coefficient preliminary calculated.
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公开(公告)号：AU776356B2
公开(公告)日：2004-09-02
申请号：AU7203000
申请日：2000-12-05
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：DE69724087D1
公开(公告)日：2003-09-18
申请号：DE69724087
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：DE69623564T2
公开(公告)日：2003-05-15
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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Patent Agency Ranking
公开(公告)号：CA2244034C
公开(公告)日：2002-03-12
申请号：CA2244034
申请日：1998-07-28
Applicant: NEC CORP
Inventor： UCHIDA KAORU
Abstract: The present invention relates to a skin pattern feature extracting apparat us for skin pattern images such as fingerprints, palm prints or ridge patterns of other parts of the body. An original image is held in an image holder, and displayed on an image display to be viewed by the operator. The operator inputs the angle of rotation and ratio of compression of a focal point of the original image for observing ridges more clearly. A perspective transforming unit generates a resultant image accordi ng to a corresponding perspective transformation (i.e., affine transformations), and a perspective transformed image display displays the resultant image to the user. The operator performs manual plotting and manual tracing with reference to the resultant image. The result of the operations is inputted to and recorded in the manua l input unit, and transformed in a feature data transforming unit to feature data.
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公开(公告)号：CA2345170A1
公开(公告)日：2001-10-27
申请号：CA2345170
申请日：2001-04-25
Applicant: NEC CORP
Inventor： UCHIDA KAORU
IPC: G06F21/32 , G06F13/00 , G06F21/00 , G06F21/10 , G06F21/20 , G06K9/00 , G06Q10/00 , G06Q30/04 , G06Q30/06 , G06Q50/00 , G07C9/00 , G07F17/16 , G10K15/02 , H04L9/32 , H04L29/06 , H04M3/38 , H04M3/493 , H04W12/00 , H04W12/06 , G06F12/14 , G06K9/62
Abstract: A user terminal including a fingerprint sensor is connected via a network to a content distribution server. The server includes at least a fingerprint-feature comparing unit and a specified content distributor. The fingerprint-feature comparing unit accesses a registered user information table in which personal information regarding a user, a user identification, and fingerprint feature information, and reads therefrom fingerprint feature information of a person who requests a content distribution so as to compare the fingerprint feature information with fingerprint feature information of the person inputted from the user terminal. The specific content distributor distributes a requested content to the user terminal only when match is made as a result of comparison. The content can therefore be distributed via a network with higher reliability and safety.
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公开(公告)号：CA2225850C
公开(公告)日：2001-08-07
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 determinati on 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：EP1990770A4
公开(公告)日：2010-12-15
申请号：EP07714712
申请日：2007-02-21
Applicant: NEC CORP
Inventor： UCHIDA KAORU
CPC classification number: G06K9/00288 , G06F21/32 , G06K9/00281 , G06K9/00906 , G06Q20/40145 , G07C9/00142 , G07C9/00158 , G07F7/10 , G07F19/20 , G07F19/207 , G07G3/003
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公开(公告)号：EP1306804A4
公开(公告)日：2007-08-15
申请号：EP01954348
申请日：2001-07-26
Applicant: NEC CORP
Inventor： UCHIDA KAORU
CPC classification number: G06K9/00026
Abstract: A method and device for fingerprint identification implementing precise identification at a high speed by using partial images of a fingerprint obtained through relative movements of a finger to a small sized sensor are provided. For reassembling a sequence of partial images inputted from a frame input section 50 into a complete image, each of the partial images is collated with a user's fingerprint image (template image) registered in a template image storage section 52 to determine a position where the partial image matches best at an optimal position calculator 55, and then combined with a partial composite image stored in a partial composite image storage section 53 at an image combining section 60. When the complete composite image is obtained after repeating the above operations, specific features are extracted from the composite image at a reference character extracting section 62, and collated with those of the template image stored in a template reference character storage section 54. Consequently, user authentication can be performed at a high speed while ensuring stability in the collating operation.
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