JP2008134862A - Vein authentication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a personal authentication device for improving authentication precision without resetting the finger even when the finger is placed with vertical or horizontal displacement at different positions in registration and authentication in a personal authentication device using a vein image. <P>SOLUTION: This vein authentication device is provided with a means for photographing a joint wrinkle image of the cushion side of the finger, and for calculating the displacement of the placed finger and the distance value of the displacement, and for correcting the position of the vein image for executing vein authentication with the corrected vein image. This vein authentication device is provided with a means for photographing the joint wrinkle image of the cushion side of the finger, and for detecting the displacement of the finger from the collation of the winkle images, and for correcting the displacement with the vein image. Thus, it is possible to improve authentication precision even when vertical and horizontal displacement occurs when placing the finger in registration and authentication. Also, it is possible to improve the precision of biometrics since a person is not identified unless the joint winkle images is matched by collation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a personal authentication device that captures a vein image using transmitted light, and relates to an authentication device that can correct a positional deviation of a finger.

  A conventional personal authentication device includes a case in which an abdominal surface of one finger can be placed downward, a light source unit that generates transmitted light from the side surface of the finger, and light transmittance for an arbitrary wavelength. An interference filter unit, an imaging unit that captures the transmitted light that has passed through the interference filter unit through a mirror, and an image processing unit for the vein image data of the finger that is output from the imaging unit. . For this reason, when collation is performed, if the placement is different from the placement of the finger when the vein information is stored, the vein image data output from the imaging unit differs greatly from the stored vein image data. Is mistaken for not being the person. However, it is difficult for the person to be verified to place the same information as when vein information is stored. Moreover, if the threshold of the collation rate determined to prevent the person from being erroneously determined is lowered, the probability that another person is recognized as the person increases, and there is a problem in the spread.

  Japanese Patent Laid-Open No. 9-69161 is known as a conventional technique, but a message is output to correct the placement of the former and the correct finger placement is guided to the collated person. The collation judgment is greatly influenced by how to place the.

JP-A-9-69161

  As disclosed in Japanese Patent Laid-Open No. 9-69161, the conventional personal authentication device has a problem in the spread because the person's finger placement is greatly influenced by the person collation determination.

  The object of the present invention is to solve the above-mentioned problems and automatically correct the position of vein information and perform collation even when a positional deviation occurs when collating vein information with the difference in finger placement. This is to provide a vein authentication device that improves collation accuracy.

  In order to achieve the above object, the present invention provides a personal authentication device that captures a vein image, a means for irradiating visible light, an image input means for inputting an image when a living body is irradiated with visible light, and the image input Feature extraction means for extracting finger heel feature information from the finger belly image input by the means, storage means for storing the feature information as feature information for comparison, and the image input means when performing personal authentication And determining means for determining whether or not a predetermined relationship is established between the feature information by comparing the feature information obtained through the feature extracting means with the feature information stored in the storage means, A means for calculating a positional deviation value between the two feature information when a predetermined relationship is established between the two characteristic information, and a finger position correction in the verification of the vein feature information from the positional deviation value obtained by the determination means Set up means It was a vein authentication device.

  With this configuration, even when the finger placement when storing the vein information and the placement of the finger are shifted at the time of collation, the position of the input vein information for collation is corrected and the recognition accuracy is improved. Is possible. In addition, it is possible to improve the accuracy of biometric recognition by collating the ventral scalp image of the finger as biometric information other than vein information.

  According to the present invention, it is possible to improve the authentication system and improve the accuracy of biometric authentication even if the finger placement is misaligned between front and back and left and right during registration and authentication.

  Hereinafter, the configuration of a system according to an embodiment of the present invention will be described with reference to FIGS.

  First, the vein authentication apparatus according to the present embodiment will be described with reference to FIG.

  FIG. 1 is a cross-sectional view of a vein authentication device according to an embodiment of the present invention. The vein authentication apparatus 101 has a near-infrared light source unit 102 for projecting a vein of a living body, which is installed on the side of a finger 106 placed on the apparatus, and captures a light source through the living body and captures a vein image. Is provided. The visible light source unit 104 for projecting a finger belly image is placed below the finger so as to irradiate the ventral side 107 of the finger 106 placed on the apparatus, and is the same as that for capturing a vein image. A finger belly image is photographed by the photographing unit 103.

  FIG. 2 is a processing block diagram of the vein authentication apparatus and the main system on which the vein authentication apparatus is mounted.

  The vein authentication device 201 is connected to the authentication processing unit 203 of the main body system 202 on which the vein authentication device is mounted. The vein authentication device 201 includes a finger detection processing unit 204 that controls a sensor (such as an electrostatic sensor) that detects a living body, an image processing unit 205 that processes a belly image of a finger, and a vein authentication processing unit 206 that performs vein pattern authentication. And a control unit 207 for controlling these processing units. In the finger abdomen image processing unit 205, a finger abdomen image input unit 207 that controls the visible light source unit 104 and the imaging unit 103, and feature information extraction that extracts feature information of joint folds from the input finger abdomen image The unit 208 and the registered finger belly feature information and matching finger belly feature information are collated, and if the collation rate is equal to or higher than a preset collation rate threshold value, a distance value indicating the positional deviation between the two feature information Is provided with a processing unit 209.

  FIG. 3 shows a process flow of feature information registration in the vein authentication apparatus 101.

  When the vein registration process starts 301, a vein information registration processing command is transmitted from the authentication processing unit 203 of the main system 202 to the vein authentication device 201, and the control unit 207 of the vein authentication device 201 receives the registration processing start command. The control unit 207 first activates the finger detection processing unit 204. The finger detection processing unit 204 activates a sensor (electrostatic sensor or the like) and monitors the state of the apparatus (302). The time for the biological detection process is set in advance. When the living body is not detected, it is checked whether or not the set time has elapsed (303). If it is within the set time, the living body detection process is performed again (302). If the set time is exceeded, the authentication process ends (314).

  When it is detected that the sensor has placed the finger on the reading unit of the apparatus (304), the visible light source unit 104 is activated to start capturing an image on the ventral side of the finger (305). Feature information on the joint heel is extracted from the photographed finger abdomen image (306). A feature amount threshold is set in advance for a finger belly image. If the extracted feature amount is equal to or greater than the threshold value, it is registered as a belly image of the registered finger (FIG. 5501). If it is less than the threshold value, the authentication processing unit 203 of the main system 202 is notified that the feature amount is insufficient, and the processing is terminated (314). When the abdomen image of the finger is registered, photographing of the vein image is started (308), and feature information is extracted from the vein image (309). A feature amount threshold value is set in advance for a vein image. If the extracted feature amount is greater than or equal to the threshold, it is registered as a registered vein image (FIG. 6601). If it is less than the threshold value, the authentication processing unit 203 of the main system 202 is notified that the feature amount is insufficient, and the processing is terminated (314).

  FIG. 4 shows a processing flow for feature information matching in the vein authentication apparatus 101.

  When the vein verification processing starts 401, a vein information verification processing command is transmitted from the authentication processing unit 203 of the main system 202 to the vein authentication device 201, and the control unit 207 of the vein authentication device 201 receives the verification processing start command. The control unit 207 first activates the finger detection processing unit 204. The finger detection processing unit 204 activates a sensor (electrostatic sensor or the like) and monitors the state of the apparatus (402). The time for the biological detection process is set in advance. When the living body is not detected, it is checked whether or not the set time has elapsed (403). If it is within the set time, the living body detection process is performed again (402). When the set time is exceeded, a biometric error is notified to the authentication processing unit 203 of the main system 202 (419), and the authentication process ends (418).

  When it is detected that the sensor places the finger on the reading unit of the apparatus (404), the visible light source unit 104 is activated to start capturing an image of the ventral side of the finger (405). Feature information on the joint heel is extracted from the photographed finger abdomen image (406). A feature amount threshold is set in advance for a finger belly image. If the extracted feature amount is less than the threshold value, the authentication processing unit 203 of the main system 202 is notified of the lack of feature amount (420), and the authentication process ends (416). If the extracted feature amount is equal to or greater than the threshold value, the belly image feature information of the registered finger (FIG. 5501) is read (407), and collation processing is performed with the input finger belly image feature information (FIG. 5502). (408). A threshold value for the finger belly image collation rate is set in advance. The verification rate is compared with a threshold value (409), and if it is less than the threshold value, it is determined as another person (410), and the process ends (418). If it is greater than or equal to the threshold value, a distance value representing a positional deviation from both feature information is calculated (410). Specifically, when the registered image obtained by extracting the feature value from the finger belly image is FIG. 5501 and the input image obtained by extracting the feature value from the input image is FIG. 5502, the positional deviation between the two images is x (503) in the X direction. , The distance value (x, y) is y (504) in the Y direction. Next, photographing of a vein image is started (411), and feature information is extracted from the vein image (412). A feature amount threshold value is set in advance for a vein image. The feature quantity is compared with a threshold value (413), and if it is less than the threshold value, the feature quantity shortage (420) is notified to the authentication processing unit 203 of the main system 202, and the process is terminated (418). If it is equal to or greater than the threshold value, the registration vein image and the input vein image are corrected for displacement (414). From the distance value (x, y) of both feature information, the origin (602) of the registered vein image (601) is moved to the X coordinate and the Y coordinate, and (x, y) is the reference origin (603). Then, a rectangle surrounded by the end point for verification (X, Y-2y) (609) is created as a registered image for verification (604). In the input vein image (605), x (606) and 2y (607) are deleted from the distance value (x, y) in the X and Y directions, respectively. A rectangle surrounded by the verification origin (x, 2y) (611) and the verification end point (X-x, Y) (610) is created as the verification input image (608). The created registered image for verification (604) is compared with the input image for verification (608) (415), and is compared with a threshold value in a preset vein image verification rate (416). If the verification rate is less than the threshold value, it is determined that the person is another person (410). If the collation rate is equal to or greater than the threshold, the person is determined (417). The determination result is notified to the authentication processing unit 203 of the main system 202 (410, 417), and the authentication process is ended (418).

  As described above, according to the present embodiment, even if there is a front / rear / left / right shift in finger placement at the time of vein information registration and verification, the vein authentication apparatus corrects the shift and corrects the accuracy of vein authentication. Can be improved. Further, since it is not determined that the person is injured unless the joint joint information of the finger is matched, biometric authentication with higher accuracy can be performed.

It is sectional drawing of the vein authentication apparatus provided with the means which installs a visible light source and image | photographs the ventral side image of a finger | toe by one Embodiment of this invention. 1 is a block diagram of a vein authentication device that can capture a belly image of a finger and correct a finger placement error according to an embodiment of the present invention. FIG. It is a registration process flow figure of the joint joint image and vein image on the ventral side of a finger by one example of the present invention. It is a collation process flowchart of the joint joint image and vein image of the ventral side of the finger by one Example of this invention. It is a joint joint image of the ventral side of a finger by one example of the present invention. 2 is a finger vein image according to an embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Vein authentication apparatus, 102 ... Near-infrared light source part, 103 ... Imaging | photography part, 104 ... Visible light source part, 501 ... Registration image of the ventral joint joint of a finger, 502 ... Input image of the ventral joint joint of a finger, 503 ... X-direction positional deviation distance value, 504 ... Y-direction positional deviation distance value, 601 ... Registered vein image, 602 ... Registered vein image origin, 603 ... Verification origin, 604 ... Verification registered image, 605 ... Input vein image, 606 ... X-direction position correction value, 607... Y-direction position correction value, 608.

Claims (4)

  In a personal authentication device that performs personal authentication using a vein image that is biometric information, a means for irradiating visible light, an image input means for inputting an image when the living body is irradiated with visible light, and an input by the image input means Feature extraction means for extracting finger heel feature information from a finger belly image, storage means for storing the feature information as feature information for comparison, and the image input means and feature extraction means when performing personal authentication Between the feature information obtained by comparing the feature information obtained through the process and the feature information stored in the storage means and determining whether or not a predetermined relationship is established between the feature information and the feature information. Means for calculating a positional deviation value between the two pieces of feature information when a predetermined relationship is established, and means for correcting the position of the finger in collating vein characteristic information from the positional deviation value obtained by the determination means; Characteristic Vein authentication apparatus characterized by enabling the position correction of the finger in the collation.   The personal authentication device stores two types of images, i.e., an abdominal heel image of a finger that is input by irradiating a living body with visible light as feature information for verification, and a vein image. A vein authentication apparatus characterized in that a person's identity is determined by comparing two types of a ventral fistula image and a vein image.   The determination means is a vein when the degree of matching between the feature information input by the image input means and the feature information obtained by the feature extraction means with the heel feature information of the belly of the finger stored in the storage means is a predetermined value or more The vein authentication apparatus according to claim 1, wherein if it is less than a predetermined value, it is determined that the person is not the person without collating the vein feature information.   The determination means is input by the image input means, and the feature information obtained by the feature extraction means has a matching degree with the heel feature information of the belly of the finger stored in the storage means when a predetermined value or more, A means for calculating a front / rear / right / left positional deviation distance from the finger belly heel characteristic information stored in the storage means, and a means for correcting the vein characteristic information input from the positional deviation distance; A vein authentication device that automatically corrects misalignment due to placement.

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