JP2010072693A - Authentication device and imaging device - Google Patents

Abstract

Provided is an authentication device that can acquire a fingerprint image and a face image without giving a user an impression that a fingerprint or a face image has been taken, and has high authentication accuracy.
The finger prints the sign on the fingerboard, the fingerprint image and the face image are taken from the back side of the fingerboard, and the user writes the sign on the fingerboard. The trajectory information is acquired. By comparing these pieces of information with the registered template information, it is determined whether or not the user is a registrant.
[Selection] Figure 5

Description

  The present invention relates to an authentication device for performing personal authentication and a photographing device used therefor.

  2. Description of the Related Art Conventionally, many authentication devices for performing personal authentication have been used in the security field. In the field of authentication devices, authentication with a personal identification number has been performed for a long time, but there is a major problem that personal authentication cannot be performed accurately when the personal identification number is leaked to another person. Therefore, in recent years, research and development of biometric technology that performs identity verification based on the physical characteristics of the user has been performed.

  Authentication devices based on biometric technology include those that capture fingerprints and collate fingerprints, those that capture facial images and collate face images, and devices that capture iris images and collate iris patterns Has been developed.

  When collating with a fingerprint image, the user puts his finger on a transparent plate and waits for shooting and collation to end. Also, when collating with face images or glow patterns, the user takes a picture of the face or glow and waits for the collation to end. For these users, there is a strong image that personal information related to their physical characteristics such as fingerprints, faces, and glows is acquired, and this places a great burden on the user. Therefore, it is assumed that some users who dislike the use of the authentication device also appear.

  In addition, when authenticating using a fingerprint or face image alone, or when the finger surface of the user is dirty or wearing glasses, there are circumstances that differ greatly from the registered fingerprint image or face image. In some cases, the authentication is not performed correctly.

  Accordingly, an object of the present invention is to provide an authentication apparatus that can acquire information related to a user's physical characteristics and accurately perform user authentication without imposing a great psychological burden on the user.

  Another object of the present invention is to provide a photographing apparatus suitable for photographing a fingerprint image with such an authentication apparatus.

  The authentication apparatus of the present invention includes a fingerprint image storage means for storing fingerprint image information for collation of each registrant, a face image storage means for storing a face image for collation of each registrant, and a collation for each registrant. Sign information storage means for storing the signature information of the user, a fingerboard made of a transparent or translucent plate for the user to write the signature, and used on the fingerboard from the back side of the fingerboard A fingerprint photographing device for photographing a fingerprint image of a finger when the person puts the finger, and a face image of the person when the user places the finger on the fingerboard from the back side of the fingerboard A face photographing device that captures images, a sign information obtaining device that obtains trajectory information when a user manually writes a signature on the fingerboard, and fingerprint information captured by the fingerprint photographing device. The fingerprint illumination is collated with the fingerprint image for collation stored in the storage means and the degree of coincidence is calculated. Acquired by the sign information acquisition device, a face collation unit that collates the face image photographed by the face photographing device with the face image for collation stored in the face image storage unit, and calculates a degree of coincidence. Signature verification means for comparing the signature trajectory information (hereinafter referred to as “signature information”) with the signature information stored in the signature information storage means to calculate the degree of coincidence, the fingerprint verification means, the face verification means, and the signature Registrant determination means for determining whether or not the user is a registrant by determining a threshold value for each degree of coincidence calculated by the verification means or its weighted addition value.

  According to this configuration, since the user's fingerprint image and face image are taken from the back side of the fingerboard, the fingerprint image and face image can be obtained without giving the user the impression that the fingerprint or face image was taken. can do. Also, authentication accuracy is improved because it is determined whether or not the person is the person based on the degree of coincidence using the three types of information of the fingerprint image, the face image, and the signature locus.

  Here, the “degree of coincidence” uses the reciprocal of various distances between two images or trajectory information.

  In the present invention, a touch panel can be used for the sign information acquisition apparatus. This makes it possible to easily obtain the trajectory information when the sign is handwritten.

  Further, in the present invention, it is provided with a sensor that senses that a finger has touched or approached the fingerprint plate, and the sign information acquisition device has a finger when the finger touches or approaches the fingerprint plate by the sensor. It can be set as the imaging device which image | photographs a locus | trajectory.

  According to this configuration, when the finger touches or approaches the fingerprint plate by the sensor, the trajectory of the finger is extracted from the image photographed by the photographing device, and the sign trajectory information is acquired. Since it can be constituted by an inexpensive apparatus called a photographing apparatus, the manufacturing cost can be reduced.

  Here, a contact sensor or an infrared sensor can be used as the sensor.

  Further, in the present invention, the fingerboard is provided with a start marker indicating a position where the user first places a finger when the user starts writing a signature. When a finger is placed at the position of the start marker, a fingerprint image of the finger can be taken. Thereby, a fingerprint image can be acquired reliably.

  In the present invention, the fingerprint plate can be a half mirror. Thereby, since the user cannot see the back of the fingerprint plate, the user is not given an impression that a fingerprint or a face image has been taken, and the psychological burden on the user can be reduced.

  In the present invention, the fingerprint imaging device, the face imaging device, or the signature information acquisition device includes a camera and a plurality of illumination light sources arranged around the camera around the camera axis. And a reflection mirror provided in the shape of an expanding surface that expands in the imaging direction of the camera around the imaging axis of the camera.

  According to this configuration, the illumination light emitted from the light source arranged around the camera is reflected by the reflection mirror and irradiated to the back surface of the fingerboard with almost uniform illuminance. Therefore, by using this photographing apparatus, it is possible to illuminate the fingerboard uniformly and photograph a fingerprint image, and it is possible to acquire the fingerprint image in a good illumination state.

  In addition, the imaging apparatus according to the present invention includes a camera, a plurality of illumination light sources disposed around the camera around the imaging axis of the camera, and the imaging axis of the camera. And a reflecting mirror provided in a shape of an expanding surface that expands in the shooting direction of the camera.

  As described above, according to the present invention, since the user's fingerprint image and face image are taken from the back side of the fingerboard, the fingerprint image is not given to the user without giving the impression that the fingerprint or face image is taken. Or a face image, and using the three types of information of a fingerprint image, a face image, and a signature trajectory, it is determined whether or not the person is the person by the degree of coincidence. Can be provided.

  In addition, it is possible to provide a photographing apparatus capable of photographing a fingerprint image by uniformly illuminating the writing board.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating a hardware configuration of the authentication device according to the first embodiment of the present invention. In FIG. 1, the authentication device 1 includes an information input box 2, a start input device 3, a computer 4, and an output device 5. The information input box 2 is a device for the user to input fingerprint image information, face image information, and signature trajectory information. The start input device 3 is a device for inputting to the computer that the user is in a state of starting use of the authentication device 1. As the start input device 3, a human sensor that detects that the user has stood before the information input box 2, an input switch for the user to instruct start of authentication, and the like are used. The computer 4 performs a personal authentication process based on the fingerprint image information, the face image information, and the signature trajectory information input from the information input box 2. The output device 5 is a device that outputs the result of personal authentication performed by the computer 4. Various devices can be considered as the output device 5, for example, an automatic door or an alarm device.

  The information input box 2 includes a casing 10, a fingerboard 10 a, a fingerprint imaging device 11, a face imaging device 12, a signature information acquisition device 13, and a finger detection sensor 14. FIG. 2 shows a plan view (a) and perspective views (b) and (c) of the information input box 2. The casing 10 is formed in a box shape having a fingerboard 10a which is a transparent or translucent plate for a user to write a signature on the upper surface. Note that a half mirror can also be used as the writing board 10a so that the inside of the casing 10 is not visible to the user.

  The fingerprint imaging device 11 is a camera that captures a fingerprint image of a finger when the user places the finger on the finger writing board 10a from the back side of the finger writing board 10a. The fingerprint imaging device 11 is provided in the casing 10 and captures an image of a finger on the fingerboard 10a through the fingerboard 10a. Since the fingerprint image needs to have a high resolution, the fingerprint imaging device 11 captures a specific narrow area on the fingerboard 10a with a high resolution.

  The face photographing device 12 is a camera for photographing a face image of a person when the user places a finger on the finger writing board 10a from the back side of the finger writing board 10a. The face photographing device 12 is provided at a corner in the casing 10 and photographs an image of the user's face through the fingerboard 10a.

  The sign information acquisition device 13 is a camera that acquires the trajectory information as a moving image when the user writes a sign on the fingerboard 10a from the back side of the fingerboard 10a. The sign information acquisition device 13 is provided in the center of the casing 10 and photographs a moving image of a finger on the fingerboard 10a through the fingerboard 10a.

  The finger detection sensor 14 is an infrared sensor for sensing that a finger has touched or approached the fingerboard 10a.

  FIG. 3 is a perspective view of the photographing device 30 used for the fingerprint photographing device 11, the face photographing device 12, and the signature information acquisition device 13.

  The photographing apparatus 30 includes a camera 31, a light shielding wall 32, an illumination light source 33, and a reflection mirror 34. The camera 31 is a camera that captures images of fingerprints, fingers, and faces, and a lens 31a is provided at the center of the upper surface of a box-shaped housing 31c with the imaging axis line facing upward. A connection connector 31b is provided on the side surface of the housing 31c.

  The light shielding wall 32 is a cylindrical wall surrounding the lens 31a. A plurality of illumination light sources 33 are arranged around the light-shielding wall 32 at equal intervals around the imaging axis of the camera 31. The reflection mirror 34 is a mirror formed in a frustoconical surface that expands in the shooting direction of the camera with the shooting axis center line of the camera 31 as the central axis. The illumination light emitted from the illumination light source 33 travels directly toward the fingerboard 10a or is reflected by the reflecting mirror 34 and travels toward the fingerboard 10a to illuminate the back surface of the fingerboard 10a substantially evenly. . The light shielding wall 32 prevents the illumination light emitted from the illumination light source 33 from directly entering the lens 31 a of the camera 31.

  FIG. 4 is an enlarged schematic view showing a part of the surface of the fingerboard 10a. On the surface of the finger writing board 10a, a start marker 10b indicating a position where the user first places a finger when the user starts writing a signature is attached. The start marker 10b is attached at a position just above the fingerprint imaging device 11. The fingerprint imaging device captures an image of the fingerprint of the finger when the user places the finger at the position of the start marker.

  FIG. 5 is a block diagram illustrating a functional configuration of the authentication device 1 according to the first embodiment of the invention. 5, the information input box 2, the start input device 3, the computer 4, the output device 5, the fingerprint photographing device 11, the face photographing device 12, the signature information obtaining device 13, and the finger detection sensor 14 are the same as those in FIGS. Corresponds to the code.

  The computer 4 includes a fingerprint image storage unit 21, a face image storage unit 22, a signature information storage unit 23, a fingerprint verification unit 24, a face verification unit 25, a signature verification unit 26, and a registrant determination unit 27.

  The fingerprint image storage means 21 stores fingerprint image information for collation of each registrant. The face image storage means 22 stores a face image for collation of each registrant. The signature information storage means 23 stores verification signature information for each registrant.

  The fingerprint collation means 24 collates the fingerprint information photographed by the fingerprint photographing apparatus 11 with the fingerprint image for collation stored in the fingerprint image storage means 21 and calculates the degree of coincidence. The face collating unit 25 collates the face image photographed by the face photographing device 12 with the collating face image stored in the face image storing unit 22 and calculates the degree of coincidence. The signature verification unit 26 compares the signature trajectory information (signature information) acquired by the signature information acquisition device 13 with the signature information stored in the signature information storage unit 23 to calculate the degree of coincidence. Here, the reciprocal of a distance function generally used in image matching is used for calculating the degree of coincidence.

  The registrant determination unit 27 determines whether or not the user is a registrant by determining a threshold value for each degree of coincidence calculated by the fingerprint collation unit 24, the face collation unit 25, and the signature collation unit 26 or a weighted addition value thereof. Make a decision.

  The operation of the authentication device 1 of the present embodiment configured as described above will be described below.

  FIG. 6 is a flowchart showing the operation of the authentication device 1. First, when the user stands in front of the authentication device 1, a start instruction is input to the computer 4 by the start input device 3 (S1). When the start instruction is input, the computer 4 captures a face image by the face photographing device 12 (S2).

  Next, it is detected by the finger detection sensor 14 whether or not the finger is placed on the finger writing board 10a. When it is detected that the finger is placed on the finger writing board 10a, the fingerprint photographing device 11 surrounds the start marker 10b. Take images at regular intervals. Then, an image at the time when the finger is photographed around the start marker 10b is extracted as a fingerprint image (S3). Whether or not the finger has been photographed can be detected by whether or not the skin color is detected in the vicinity of the start marker 10b of the photographed image.

  If a finger is not detected after a certain period of time, the process is terminated and the process ends.

  Next, the signature information acquisition device 13 captures the entire area of the fingerboard 10a at regular time intervals, and acquires a video image of the user's signature (S4). Here, this imaging is performed until a finger is no longer detected by the finger detection sensor 14 for a certain time or more. Then, the computer 4 extracts only images while the finger detection sensor 14 is detecting the finger, extracts the position of the fingertip from these images, and generates a fingertip trajectory image.

  Next, the fingerprint collation unit 24, the face collation unit 25, and the signature collation unit 26 respectively obtain the fingerprint image, the face image, and the signature trajectory image obtained by the fingerprint image storage unit 21, the face image storage unit 22, and the sign. The degree of coincidence is calculated by collating with the template image of each registrant stored in the information storage means 23 (S5).

  Here, since the error (blurring) is large in the verification of the signature trajectory image, matching by dynamic programming is performed, and the acquired signature trajectory image is compared with the template image. In this collation, a plurality of candidates are detected in order from the candidate with the highest degree of matching.

  Next, the registrant determination unit 27 determines whether each user is a registrant by determining each matching degree calculated by the fingerprint verification unit 24, the face verification unit 25, and the signature verification unit 26 or a weighted addition value thereof as a threshold. It is determined whether or not (S6).

  Finally, the computer 4 outputs the determination result to the output device 5 and ends the authentication process (S9).

  As described above, highly reliable personal authentication can be performed by collating fingerprint images, face images, and signature information together. In addition, since the user is not aware that the fingerprint image or the face image has been acquired, the psychological burden on the user can be reduced.

  In the present embodiment, a camera is used as the signature information acquisition device 13, but a touch panel can be used as the signature information acquisition device 13 in addition to this.

It is a figure showing the hardware constitutions of the authentication apparatus which concerns on Example 1 of this invention. It is the top view (a) of the information input box 2, and perspective view (b), (c). 1 is a perspective view of a photographing device used for a fingerprint photographing device 11, a face photographing device 12, and a signature information acquisition device 13. FIG. FIG. 4 is an enlarged schematic view showing a part of the surface of the fingerboard 10a. It is a block diagram showing the function structure of the authentication apparatus which concerns on Example 1 of this invention. 3 is a flowchart showing the operation of the authentication device 1.

Explanation of symbols

Authentication device 1
Information input box 2
Start input device 3
Computer 4
Output device 5
Casing 10
Fingerboard 10a
Start marker 10b
Fingerprint camera 11
Face photographing device 12
Sign information acquisition device 13
Finger detection sensor 14
Fingerprint image storage means 21
Face image storage means 22
Sign information storage means 23
Fingerprint verification means 24
Face matching means 25
Signature verification means 26
Registrant determination means 27
Imaging device 30
Camera 31
Lens 31a
Connector 31b
Case 31c
Shading wall 32
Illumination light source 33
Reflection mirror 34

Claims (7)

Fingerprint image storage means for storing fingerprint image information for collation of each registrant;
Face image storage means for storing a face image for collation of each registrant;
Signature information storage means for storing signature information for verification of each registrant;
A fingerboard that is a transparent or translucent board for a user to write a signature;
A fingerprint imaging device that captures an image of a fingerprint of a finger when a user places a finger on the fingerboard from the back side of the fingerboard;
A face photographing device for photographing a face image of the user when the user places a finger on the fingerboard from the back side of the fingerboard;
A sign information acquisition device for acquiring the trajectory information when the user writes a signature on the fingerboard;
Fingerprint collation means for collating fingerprint information photographed by the fingerprint photographing device with a fingerprint image for collation stored in the fingerprint image storage means and calculating a matching degree;
Face collation means for collating a face image photographed by the face photographing device with a face image for collation stored in the face image storage means, and calculating a matching degree;
Signature verification means for comparing the signature trajectory information (hereinafter referred to as “signature information”) acquired by the signature information acquisition apparatus with the signature information stored in the signature information storage means;
A registrant determination unit that determines whether or not the user is a registrant by determining a threshold value for each degree of coincidence calculated by the fingerprint verification unit, the face verification unit, and the signature verification unit or a weighted addition value thereof. When,
An authentication apparatus comprising:   The authentication apparatus according to claim 1, wherein the sign information acquisition apparatus is a touch panel. A sensor for sensing that a finger touches or approaches the fingerprint plate;
The authentication apparatus according to claim 1, wherein the sign information acquisition device is a photographing device that photographs a finger trajectory when the finger touches or approaches the fingerprint plate by the sensor. The fingerboard is provided with a start marker that indicates a position where the user first places a finger when starting to write a signature.
The authentication apparatus according to claim 1, wherein when the user places a finger at the position of the start marker, the fingerprint photographing apparatus photographs a fingerprint image of the finger.   The authentication apparatus according to claim 1, wherein the fingerprint plate is a half mirror. The fingerprint imaging device, the face imaging device, or the sign information acquisition device,
A camera,
A plurality of illumination light sources arranged around the camera around the imaging axis of the camera;
A reflection mirror provided in an expanding surface shape that expands in the imaging direction of the camera, with the imaging axis of the camera as the center,
The authentication apparatus according to claim 1, wherein the authentication apparatus comprises: A camera,
A plurality of illumination light sources arranged around the camera around the imaging axis of the camera;
A reflection mirror provided in an expanding surface shape that expands in the imaging direction of the camera, with the imaging axis of the camera as the center,
An imaging apparatus comprising:

Images