JP2016057850A - Biometric authentication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems with biometric authentication devices that no authentication is possible unless a user places a biological portion in an appropriate position, that the quantity of required calculation is increased by round-robin search for the optimal matching position with changes in the collating position little by little to accept positional deviations of the biological portion for better convenience, and that the possibility of erroneously matching another person's pattern is increased.SOLUTION: In a biometric authentication device, in addition to a camera for photographing biological information, another camera for photographing a living body in other directions is provided. In this case, the position in which the living body is placed is detected by using images photographed with the other camera for photographing the living body in other directions; if placement of the body is deviated in front-to-rear and/or right-to-left directions, the biological information is corrected according to the position of the living body; and collation with a pre-registered registration pattern is processed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a biometric authentication device that performs identity verification.

  Biometric authentication devices that authenticate users using biometric information are used in various devices and systems. When the user is authenticated by the biometric authentication device, the user reads the biometric information by performing an operation of holding a predetermined part of the body such as a finger or an eye over the authentication device or a peeping operation (authentication operation), and the biometric information is extracted from the biometric information. The matching amount is calculated by comparing the feature amount with the feature amount of the biometric information registered in advance by the person, and the person is determined based on whether the degree of matching exceeds a predetermined threshold.

  When performing personal authentication in the biometric authentication device, one of the factors that cause the person to be mistakenly rejected is a different way of placing the biometric during registration and biometric during authentication. There are cases.

  As a method for preventing such refusal, there is a technique described in, for example, Japanese Unexamined Patent Application Publication No. 2009-178300 (Patent Document 1). In this publication, “a finger placed on the placement board is imaged by a finger position detection camera, the position of the finger is detected from the image information, and the quality of the finger is determined. When it is determined that the position is defective, a screen for guiding the user to correctly place the finger on the placement board is displayed on the display unit. "

JP 2009-178300 A

  In Patent Document 1, authentication is possible if the user can reposition the living body to the correct position, but authentication cannot be performed if the living body is still placed at a position where the user cannot authenticate. In addition, a technique for searching for an optimal match position based on brute force is generally performed while shifting the matching position little by little in pattern matching at the time of matching so as to allow biometric displacement for convenience in biometric authentication. The brute force matching search increases the amount of calculation in matching, and increases the possibility of matching with another person's pattern by mistake.

  Therefore, the present invention can provide guidance for prompting the user to place the living body at the correct position more easily by providing a camera near the living body. Further, if the living body is displaced, the brute force matching is performed. It is another object of the present invention to provide a biometric authentication device that does not increase the amount of calculation and the acceptance rate of others.

  As one of the biometric authentication devices that solve the above-described problem, for example, a guide unit that guides a living body to a presentation position, a light source unit that is positioned above the guide unit and emits light toward the presented living body, and a guide And an imaging unit capable of photographing the light source side and the opening side of the living body presented on the guide unit.

  According to the present invention, in the biometric authentication device, the displacement of the living body is detected by a camera that captures images from a different direction and the biometric information is corrected according to the displacement of the position, thereby enabling authentication. The convenience of the authentication device is improved.

  In addition, since a brute force search for absorbing misalignment is not necessary in the collation process, the amount of calculation in matching is reduced, and the possibility of erroneous matching with another person's pattern can be reduced.

The layout which shows arrangement | positioning of the components which comprise the biometrics apparatus of this invention. The block diagram which shows the structure of the biometrics apparatus of this invention. The registration processing flowchart which shows the procedure which registers a user's biological body. The authentication process flowchart which shows the procedure which performs biometric authentication of a user. The figure explaining the image correction method of the biometrics apparatus of this invention. The figure explaining the method to detect the position of the finger | toe of the biometrics apparatus of this invention. The example of the screen display which instruct | indicates the replacement of the finger | toe at the time of biometric registration. The example of the screen display which instruct | indicates the replacement of the finger | toe at the time of biometric registration. Example of registration data of the present invention The example of the screen display which instruct | indicates the replacement of the finger | toe at the time of biometrics authentication. The example of the screen display which instruct | indicates the replacement of the finger | toe at the time of biometrics authentication. The figure explaining the position shift correction process of the biometric authentication apparatus of this invention. The layout which shows arrangement | positioning of the components which comprise the biometrics apparatus of this invention. The example of the biometric image image | photographed with the biometrics apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A. Device Configuration An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating the arrangement of the biometric authentication device 100 according to this embodiment. FIG. 1A is a cross-sectional view of the biometric authentication device 100 as viewed from the side. FIG. 1B is an enlarged perspective view of a portion of the biometric authentication device 100 that presents a living body (hereinafter referred to as a finger) 10.

  The biometric authentication device 100 has a light source unit 103 that irradiates a finger 10 to be presented with suitable near-infrared light, and an opening that allows the light emitted from the light source unit 103 to pass through the finger 10 and pass the transmitted light. 114, a first imaging unit 101 that captures the transmitted light that has passed through the opening 114, a second imaging unit 102 that captures the presented finger 10, and a guidance to hold the finger 10 over a predetermined presentation position And a living body detection unit 104 that detects that the finger 10 has been presented to the guide unit 115.

  The first imaging unit 101 is an imaging unit that captures transmitted light that has passed through the lower half surface of the finger 10, and is positioned below the opening 114 (also referred to as being disposed on the opening side). The image photographed by the first imaging unit 101 is used for extracting a blood vessel pattern used for light amount control and biometric authentication.

  The second imaging unit 102 is positioned obliquely above the finger 10 presented on the guide unit 115 (also referred to as being disposed on the light source unit side), and captures an upper half surface of the presented finger 10. It is. An image captured by the second imaging unit 102 is used to detect a position where a finger 10 described later is placed. Note that the second imaging unit 102 may capture near-infrared light, or may capture visible light. Further, the installation position of the second imaging unit 102 is not limited to being installed obliquely above the finger 10 (or the guide unit 115), and may be installed at a position where the finger 10 can be photographed from directly above.

  The light source unit 103 is configured by an LED or the like that irradiates near-infrared light to capture a blood vessel pattern on the finger 10. Moreover, it is located above the finger 10 as shown in FIG. Note that the LED or the like constituting the light source unit 103 can be irradiated by adjusting the amount of near infrared light by the main control unit 110. In FIG. 1A, the position is above the finger than the second imaging unit 102, but the position is not limited to this, that is, the position where the position is switched with the second imaging unit 102, that is, obliquely above the finger 10. May be.

  The living body detection unit 104 includes a sensor that detects the finger 10 presented on the guide unit 115. A fingertip detection sensor that detects the tip of the presented finger 10 and a fingertip detection sensor that detects the base of the finger 10 are provided. When the living body detection unit 104 detects the presented finger 10, the detection signal is transmitted to the main control unit 110, and near infrared light is emitted from the light source unit 103. The living body detection unit 104 may be configured to include any one of a fingertip detection sensor and a fingertip detection sensor.

  The opening 114 is an opening for allowing the transmitted light transmitted through the finger 10 to pass therethrough, which is positioned below the guide unit 115 and the finger 10 presented on the guide unit 115 and above the first imaging unit 101. . The opening 114 is made of a transparent acrylic plate or the like so that dust or the like does not enter the first image pickup unit 101. The acrylic plate is provided with a filter capable of blocking natural light such as sunlight. Also good.

  The guide unit 115 includes a support unit that guides and supports the finger 10 to a correct position for biometric authentication, and a light blocking unit that blocks external light from the side surface. Since the finger 10 is supported by the support part of the guide part 115, the finger 10 does not contact the opening part 114, and the finger 10 is pressed when an image of the finger 10 is photographed, which affects the extraction of the blood vessel pattern. Never give.

  Next, a schematic configuration of the biometric authentication device 100 in the present embodiment will be described with reference to the block diagram of FIG. The biometric authentication device 100 includes the first imaging unit 101, the second imaging unit 102, the light source unit 103, the biometric detection unit 104, the display unit 111, the storage unit 112, and the communication unit 113 described with reference to FIG. These are controlled by the main control unit 110. The biometric authentication device 100 is connected to the upper terminal 200 via the communication unit 113.

  The display unit 111 is a display unit that displays an announcement that prompts the user to correct the placement when the finger 10 described later is placed incorrectly (finger displacement or roll) by a control signal from the main control unit 110. is there. The display unit 111 may be a separate component connected to the main control unit 110 by a cable or the like. In other words, it may be a component of the biometric authentication device 100 or may be handled as a separate part. In addition, the biometric authentication device 100 may include the display unit 100, or the screen may be output to the display device included in the host device 200 connected from the main control unit 110 via the communication unit 113.

  The storage unit 112 is a recording unit that records a program necessary for the operation of the biometric authentication device 100, images captured by the first imaging unit 101 and the second imaging unit 102, and a blood vessel pattern necessary for biometric authentication.

  The communication unit 113 is a communication unit that is connected to the host device 200 and transmits and receives signals between the main control unit 110 and the host device 200.

  The host device 200 is connected to the communication unit 113, is connected to the host device 200, and transmits and receives signals between the main control unit 110 and the host device 200. Although not shown, the host device 200 also includes a control unit, a display unit, and an input unit. For example, when the biometric authentication device 100 is installed at an ATM, the ATM corresponds to the host device 200, and when the biometric authentication device 100 is installed at a bank window, a staff terminal used by a bank staff corresponds to the host device 200.

  The main control unit 110 is a control unit that is electrically connected to each unit illustrated in FIG. 2, transmits and receives control signals, and controls the biometric authentication apparatus 100 as a whole. The main control unit 110 performs biometric information registration processing or authentication processing using a program stored in the storage unit 112, details of which will be described later. The main control unit includes a CPU, a memory, and the like (not shown), and performs control by developing a program stored in the storage unit 112 in the memory and executing the program.

B. Biometric Information Registration Processing Next, biometric information registration processing using the biometric authentication device 100 according to the present embodiment will be described. FIG. 3 is a flowchart for explaining biometric information registration processing using the biometric authentication device 100 according to the present embodiment.

  In step 300, the biometric authentication device 100 uses the biometric detection unit 104 to detect that the finger 10 has been placed on the guide unit 115. While it is determined that the finger 10 is not placed, the living body detection step 300 is repeated, and when the living body detection unit 104 detects that the finger 10 is placed from the output, the process proceeds to the next step.

  In step 310, when it is detected that the finger 10 is placed, the second imaging unit 102 acquires an image of the finger 10 placed on the guide unit 115. In step 320, the main control unit 110 detects the position where the finger 10 is placed from the biological image acquired by the second imaging unit 102, and whether or not the placed position is suitable for acquiring biological information. Judging. The details of the process for determining whether or not the position where the finger 10 is placed is an appropriate position will be described later. Further, an image photographed by the second photographing unit 102 may be referred to as a second biological image.

  In step 330, when the main control unit 110 determines that the position where the finger 10 is placed is not appropriate (also referred to as inappropriate), the process proceeds to step 340 and determines that the position where the finger 10 is placed is appropriate. If yes, go to Step 350.

  Step 340 is acquired by the second imaging unit 102 and the guidance message for instructing repositioning of the finger 10 when the main control unit 110 determines that the position where the finger 10 is placed is inappropriate. The biological image is corrected to an upright state when viewed from the user and displayed on the display unit 111. Details of the screen displayed on the display unit 111 will be described later. After instructing repositioning on the display unit, step 300 is repeated until the finger 10 is placed again.

  In step 350, when the main control unit 110 determines that the position where the finger 10 is placed is appropriate, the main control unit 110 adjusts the light amount of the light source unit 103 to a state suitable for imaging a living body, and the first imaging unit. A biometric image of the finger 10 is acquired using 101. Note that the biometric image captured by the first imaging unit 101 may be referred to as a first biometric image.

  In step 360, the main controller 110 uses the first biological image to extract a blood vessel pattern that is characteristic information at the time of personal authentication.

  In step 370, the main control unit 110 converts the blood vessel pattern extracted in step 360 into a data form suitable for verification for authenticating the person and matches the position coordinate information on the living body detected in step 330. The registration data is recorded in the storage unit 112 as biometric registration data. An example of registration data will be described later. In addition, the registration result may be notified to the host terminal 200 via the communication unit 113. With the above steps, the registration process is completed.

C. Placement Detection Process The position detection process of the finger 10 in step 320 of the biometric information registration process will be described with reference to FIG.
When the finger 10 is imaged by the second imaging unit 102, a biological image (a) shown in FIG. 5A is obtained. In FIG. 5A, since the second imaging unit 102 captures an image from one direction of the finger 10, the body part is turned upside down and becomes a trapezoidally distorted image.

  The biological image FIG. 5A is subjected to image processing to perform image rotation and trapezoidal distortion correction, whereby an upright biological image FIG. 5B is obtained. In this embodiment, since the second imaging unit 102 is located at the position shown in FIG. 1, trapezoidal distortion correction is performed. However, for example, when the second imaging unit 102 is located at the position of the light source 103, photographing is performed. If the captured image is not distorted, it is not necessary to correct the biological image.

  Next, the absolute value is obtained by subtracting the luminance values of the corresponding pixels of the two images using the image FIG. 5C and the biological image FIG. Thus, the difference image FIG. 5D is obtained. A pixel having no change in the two images has a small difference in luminance value, and a pixel in which the luminance value has changed by placing a living body has a large difference in luminance value, so that the finger 10 can be extracted.

  The contour image of the living body is obtained by extracting the contour line of the pixel having a difference value equal to or larger than the prescribed value in the obtained differential image FIG. 5D by the contour line tracking process. Note that the outline tracking process is a general technique of image processing, and thus description thereof is omitted.

D. Placement Determination and Screen Display during Registration Next, the living body placement determination process in step 330 and the screen display process in step 340 will be described with reference to FIGS. 6, 7, and 8.

  FIG. 6 is a diagram for explaining processing for determining how to place the finger 10 in the front-rear direction using the contour image of the finger 10 detected in step 320 (e). The contour image of the finger 10 is scanned from the upper end of the image to detect the coordinates of the uppermost end of the contour (FIG. 6A). When the coordinates of the upper end are within the specified range indicated by the hatched portion in FIG. 6B, the position of the finger 10 in the front-rear direction is determined to be appropriate (FIG. 6B).

  Further, the determination of the position of the finger 10 in the left-right direction can also be determined by a similar process. Specifically, the contour image of the finger 10 is scanned from the left end of the image to detect the leftmost coordinate of the contour (FIG. 6C). Similarly, the contour image of the living body is scanned from the right end of the image, and the coordinates of the rightmost end of the contour are detected (FIG. 6 (e)). When the leftmost coordinate is within the specified range (FIG. 6D) and the rightmost coordinate is within the specified range (FIG. 6F), the position of the living body in the left-right direction is appropriate. It is determined that As a result of the above processing, when the front-rear direction and the left-right direction of the living body are at appropriate positions, it is determined that the position of the living body is appropriate (FIG. 6G).

  In this embodiment, the range of coordinates for determining the front-rear direction and the left-right direction is determined in advance based on the average value of the finger placement position, but it is determined whether another placement value is appropriate. You may judge.

  FIG. 7 is a diagram for explaining a screen display that prompts the user to reposition the finger 10 when the finger 10 is shifted and placed on the front side. In the determination process of the placement position of the finger 10, if the coordinates of the upper end of the contour line of the finger 10 are detected below the specified range, it is determined that the living body has been placed shifted forward (FIG. 7A). ). In step 340, the display unit 111 displays a message for informing the user that the finger 10 is not properly placed (FIG. 7B). At this time, a biological image captured by the second imaging unit 102 and corrected to an upright state, a line segment representing the uppermost coordinates of the finger 10 detected in step 330, and an image indicating a range of an appropriate placement position are displayed. Thus, it is possible to guide the user to reposition the finger 10 appropriately.

  FIG. 8 is a diagram for explaining a screen display that prompts the user to reposition the finger 10 when the finger 10 is shifted from side to side. In the determination processing of the position where the finger 10 is placed, if the left end coordinate of the outline of the finger 10 is detected outside the specified range, or the right end coordinate is detected outside the specified range, the finger 10 is It is determined that it has been shifted to (Fig. 8 (a)). In step 340, the display unit 111 displays a message for notifying the user that the finger 10 is not properly placed (FIG. 8B).

  At this time, the biological image captured by the second imaging unit 102 and corrected to the established state, the line segment representing the leftmost coordinate of the finger 10 detected in step 330, the line segment representing the rightmost coordinate of the finger 10, and By displaying an image indicating the range of the appropriate placement position, it is possible to guide the user to reposition the finger 10 appropriately. Note that, as shown in FIG. 8B, it is not necessary to display the leftmost end coordinate and the rightmost end coordinate, and either one may be displayed on the display unit 111.

E. Registration Data FIG. 9 is a diagram for explaining registration data in the biometric authentication registration process.

  In the present embodiment, the data obtained by converting the blood vessel pattern image extracted from the first biometric image in the registration process into a data form suitable for verification for personal authentication is used as biometric feature data, and the position detection process is performed as biometric position coordinate information. As the upper end coordinates, left end coordinates, and right end coordinates of the contour information of the living body detected in step 3, information obtained by combining these is used as registration data.

  The registration data is stored in the storage unit 112 in the biometric registration process, and is read from the storage unit 112 in the authentication process. The registration data may be stored in the storage unit 112 together with information for identifying the person (for example, an account number or ID number).

F. Authentication process of biometric information An authentication process of the biometric authentication apparatus 100 according to this embodiment will be described. FIG. 4 is a flowchart illustrating an authentication process using the biometric authentication device 100 according to this embodiment.

  In step 400, the main control unit 110 reads biometric registration data stored in the storage unit 112 in accordance with an instruction from the upper terminal 200. The biometric registration data stored in the storage unit 112 to be read here is biometric registration data registered in advance by a registration process.

  In step 410, the main control unit 110 determines whether the finger 10 is placed on the biometric authentication device 100 based on the output of the biometric detection unit 104. While it is determined that the finger 10 is not placed, the step 410 for detecting the finger 10 is repeated, and when it is detected that the finger 10 is placed, the process proceeds to the next step.

  In step 420, the second imaging unit 102 acquires a second biological image. In Step 430, the position where the finger 10 is placed is detected from the second biological image acquired by the second imaging unit 102.

  In step 440, it is determined whether or not the finger 10 is placed at an appropriate position. When it is determined that the placed position is not appropriate, the process proceeds to step 450, and when it is determined that the position where the finger 10 is placed is appropriate, the process proceeds to step 460. Details of the position detection process of the finger 10 during authentication will be described later.

  In Step 450, when it is determined that the position where the finger 10 is placed is inappropriate, the guidance message for instructing the finger 10 to be placed again and the second living body acquired by the second imaging unit 102. The image is corrected to an upright state and displayed on the display unit 111.

  In step 460, the light amount of the light source unit 103 is adjusted to a state suitable for imaging of the finger 10, and a first biological image is acquired using the first imaging unit 101.

  In step 470, correction processing is performed according to the positional deviation where the finger 10 is placed. In the registration process, the positional deviation amount is detected by comparing the biological body position coordinate information registered in the registration data with the biological body position coordinate information detected in step 430. The living body image is cut out from the living body image obtained by the first imaging unit acquired in step 460 according to the amount of displacement. By this cut-out, it is possible to obtain a biometric image in a state where the first biometric image is not misaligned (the same position as the way of registration). Details of the misalignment correction processing in step 470 will be described later.

  In step 480, a blood vessel pattern serving as feature information at the time of personal authentication is extracted from the biometric image cut out in step 470.

  In step 490, a blood vessel pattern matching process is performed. Using bioregistration data registered in advance and the matching blood vessel pattern obtained in step 480 without misalignment, matching is performed by pattern matching to calculate the degree of coincidence.

  In step 495, authentication is determined from the degree of coincidence obtained in step 490, and the determination result is notified to the upper terminal.

  The authentication process is completed by the above steps.

G. Placement determination and screen display at the time of authentication The determination process of how to place the finger 10 in step 440 and the screen display process in step 450 will be described with reference to FIGS.

  FIG. 10 is a diagram for explaining a screen display when the finger 10 is shifted and placed on the front side. In step 440, the upper end coordinate of the finger 10 at the time of authentication is compared with the upper end coordinate at the time of registration recorded in the registration data, and if a difference equal to or greater than a predetermined value is detected, it is determined that the living body is displaced back and forth. (FIG. 10A).

  In step 450, a message for notifying the user that the living body is not properly placed is displayed (FIG. 10B). At this time, the second living body image captured by the second imaging unit and corrected to the upright state and the line segment representing the upper end coordinates recorded in the registration data are displayed, so that the user can appropriately replace the living body. Can be guided. A line segment representing the uppermost coordinate of the living body detected in step 440 may be displayed.

  FIG. 11 is a diagram for explaining a screen display when the finger 10 is placed shifted from side to side. In step 440, the left end coordinate of the finger 10 at the time of authentication is compared with the left end coordinate at the time of registration recorded in the registration data. Similarly, the right end coordinate of the living body at the time of authentication and the right end coordinate at the time of registration recorded in the registration data Are compared, and if any of the differences equal to or greater than the specified value is detected, it is determined that the living body is shifted left and right (FIG. 11A). In step 450, a message for informing the user that the finger 10 is not properly placed is displayed (FIG. 11B). At this time, the second living body image captured by the second imaging unit and corrected to the upright state and the line segment representing the left end coordinate and the right end coordinate at the time of registration recorded in the registration data are displayed to the user. Appropriate repositioning of the living body can be induced. In addition, you may display the line segment showing the left end coordinate and right end coordinate of the biological body detected at step 440.

H. Misalignment Correction for Pattern Matching The misalignment correction process in step 470 at the time of authentication will be described with reference to FIG.

  The blood vessel pattern of biometric registration data used for biometric authentication is registered in advance by a registration process. In the registration process, it is determined that the finger 10 is properly placed, and in the state where the finger 10 is properly placed (FIG. 12A), the biometric image is acquired, and the first imaging unit A central portion of the imaging range is cut out to extract a blood vessel pattern, and registration data is generated (FIG. 12C).

  In order to improve user convenience in performing biometric authentication, it is desirable to perform authentication that allows a certain amount of biometric displacement. Therefore, in order to perform a biometric collation process that allows the biometric displacement, it is necessary to perform collation in consideration of the positional deviation.

  In the positional deviation correction processing (step 470) of the present embodiment, the position of the finger 10 first detected in step 440 is compared with the living body position at the time of registration recorded in the registration data, and the positional deviation amount of the finger 10 is compared. Is calculated (FIG. 12D).

  As illustrated in FIG. 12E, a position shift is obtained by cutting out an image in accordance with the calculated amount of displacement of the living body in the imaging range of the first living body image captured by the first imaging unit 101. A living body image having no image is cut out (FIG. 12F). For example, when an image obtained by cutting a predetermined range from the center of the imaging range is used as a blood vessel pattern image used for biometric authentication, when a position shift occurs by a certain value in the fingertip direction, the range to be cut by that value is indicated. By moving the image in the original direction, it is possible to cut out an image as if no positional deviation occurred.

  By detecting the displacement of the finger 10 as described above, it is possible to perform authentication by correcting the biometric image according to the displacement of the position of the finger 10.

  In the present embodiment, the configuration including the first imaging unit 101 and the second imaging unit 102 as described above enables acquisition of biometric information in which the positional deviation of the finger 10 is suppressed during registration or authentication. it can. In particular, the second imaging unit 102 is installed obliquely above the finger 10 and the finger 10 is imaged, so that it is possible to more accurately grasp how much the finger 10 has been displaced in the front-rear and left-right directions. In addition, by grasping the positional deviation, it is not necessary to perform a brute force search that is generally performed in order to deal with the positional deviation in the collation processing, so the amount of calculation in the collation is reduced, and other people It is possible to reduce the possibility of erroneous matching with the biometric information.

  In the first embodiment, the biometric authentication apparatus 100 using the first imaging unit 101 and the second imaging unit 102 has been described. In this embodiment, a biometric authentication device 100 using a reflecting mirror 1301 instead of the second imaging unit will be described. Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. In addition, since what has the same code | symbol as 1st Example has the same function, description is abbreviate | omitted. Also, the biometric information registration process and authentication process in this embodiment are the same as those in the first embodiment, and the description thereof will be omitted.

  FIG. 13 is a diagram for explaining the arrangement of the biometric authentication device 100 in the present embodiment. The difference from the first embodiment is that the first imaging unit 101 images the lower half surface of the finger 10 to image the blood vessel pattern of the living body 10 and detects the position where the living body 10 is placed by the reflector 1301. Therefore, the first imaging unit is arranged to image the half surface opposite to the blood vessel pattern so as to image the entire upper side of the living body.

  FIG. 14 is a diagram illustrating an example of a first biological image captured by the first imaging unit 101 in the present embodiment.

  When the living body 10 is imaged by the first imaging unit 101, the half of the angle of view that can be captured by the first imaging unit 101 passes through the reflector 1301 and the entire upper side of the living body 10 for detecting the position where the finger 10 is placed. Is captured (FIG. 14A). On the other hand, a blood vessel pattern image used for biometric authentication is captured on the other half of the angle of view (FIG. 14B). It is possible to detect the position of the living body and extract the blood vessel pattern by using the respective portions of the first biological image photographed with this configuration.

  In FIG. 14, there is a region where nothing is captured between the biological image and the blood vessel pattern image. However, FIG. 14 is described for easy understanding of the first biological image. There are no or few things. In this embodiment, the imaging method using the reflecting mirror 1301 has been described. However, an imaging method using reflection / refraction by a prism or a light guide tube may be used.

  By adopting the configuration of the present embodiment, it is possible to detect the position of the living body and extract the blood vessel pattern without using the second imaging unit 102 used in the first embodiment. And authentication can be performed at low cost.

  The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

DESCRIPTION OF SYMBOLS 10 ... Finger 100 ... Biometric authentication apparatus 101 ... 1st imaging part 102 ... 2nd imaging part 103 ... Light source part 104 ... Biometric detection part 110 ... Main control part 111 ... Display unit 112 ... Storage unit 113 ... Communication unit 200 ... Upper terminal 1301 ... Reflector

Claims (7)

A guide unit for guiding the living body to the presentation position;
A light source unit that is positioned above the guide unit and that emits light toward the presented living body;
An opening that is located below the guide and allows the transmitted light transmitted through the living body to pass through;
A biometric authentication device comprising: an imaging unit capable of imaging the light source unit side and the opening side of a living body presented on the guide unit. The biometric authentication device according to claim 1,
The imaging unit is located below the opening and captures the first side of the living body as a first biological image, and the light source unit of the living body is positioned above the guide unit. And a second imaging unit that images the side as a second biometric image. The biometric authentication device according to claim 2,
The position of the end of the living body presented to the guide unit is extracted from the second living body image as living body position information, and it is determined whether or not the living body position information is located within a predetermined range. When not located, the biometrics authentication apparatus characterized by including the control part which outputs the display which accelerates | stimulates replacement of the said biometric. The biometric authentication device according to claim 3,
A storage unit for storing biometric information used for biometric authentication extracted from the first biometric image;
The control unit extracts the biometric information from the first biometric image and stores the biometric information in the storage unit together with the biometric position information when the biometric body is located in the predetermined range. . The biometric authentication device according to claim 2,
A storage unit that stores the position of the end of the living body presented to the guide unit from the second biological image captured in advance as biological position information;
When the position of the living body presented on the guide unit is extracted from the newly photographed second living body image, it is determined whether or not the position of the living body is in a predetermined range, and the position is not in the predetermined range Comprises a control unit that outputs a display prompting the user to reposition the biometric. The biometric authentication device according to claim 2,
The biometric information used for biometric authentication extracted from the first biometric image captured in advance and the position of the end of the biometric presented on the guide unit from the pre-captured second biometric image are associated with the biometric location information. A storage unit for storing,
The biological position information is extracted from the newly captured second biological image, the difference between the biological position information stored in the storage unit and the newly extracted biological position information is calculated, and the newly captured first image A biometric information used for biometric authentication is extracted from a position based on the difference from one biometric image, and the biometric information stored in the storage unit is compared with the newly extracted biometric information. A biometric authentication device. The biometric authentication device according to claim 1,
A reflection member that reflects the light source side image of the living body presented to the guide unit;
The imaging unit is located below the opening and captures the light source side and the opening side of the living body reflected by the reflecting member as one image, and a biometric authentication device .

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