JP4527031B2 - Personal authentication device - Google Patents

Description

  The present invention relates to a personal authentication apparatus that performs personal authentication using finger vein pattern data.

  Patent Document 1 discloses a case provided with an insertion part that can insert a fingerprint of one finger toward a lower surface, a light source unit that irradiates transmitted light from the upper surface of the finger, and light for an arbitrary wavelength. A personal authentication apparatus having an interference filter unit having transparency, an imaging unit for imaging transmitted light that has passed through the interference filter unit, and an image processing unit for vein image data of the finger output from the imaging unit is described. Has been.

  In Patent Document 2, in a personal authentication device having a personal registration information input unit and a personal biometric information processing unit, the personal biometric information input unit and an opening lid unit covering at least the personal biometric information input unit Personal authentication comprising: a fixing unit that locks or cancels the locking unit; and a control unit that locks or releases the fixing unit by comparing information input from the personal registration information input unit with personal registration information registered in advance. An apparatus is described.

  In Patent Document 3, a finger placement guide for setting a finger position, a light source unit for irradiating the finger with transmitted light, an image capturing unit for capturing the transmitted light, and images captured by the image capturing unit are disclosed. An authentication unit that performs an authentication process, and the finger placement guide includes: an authentication target finger placement guide unit in which an authentication target finger is set; and an authentication target non-authentication finger placement guide unit in which an authentication target finger is set. It is described in the provided finger authentication device.

  The authentication target finger placement guide portion has an opening corresponding to the optical opening where the authentication target finger is set and authentication is performed, and a root portion of the authentication target finger is a recess along its outer shape. It is described that it has a shape.

JP 2004-49705 A JP 2005-128935 A JP 2005-128936 A

  Expectations for personal authentication technology are increasing for the purpose of safe management of property and information. In particular, biometric authentication technology that uses a part of the human body as a key has attracted attention because it is less likely to be illegally exercised due to loss or theft, compared to the conventional management using a personal identification number or key. The authentication method using the blood vessel pattern of the finger does not resemble a crime like a fingerprint or irradiates light directly on the eyeball like a mosquito. It has the advantage that it is difficult to counterfeit because it reads the internal features rather than the surface.

  Finger length varies from person to person. Some people have a length of L, others have a length of M, and some have a length of S. Adults and children have very different lengths. Therefore, considering the finger length when performing personal authentication using the finger vein pattern is important for collating the detected finger vein pattern with a previously registered finger vein pattern.

  In view of this point, the present invention provides a finger vein pattern that can be collated with a finger vein pattern registered in advance with a finger vein pattern detected in consideration of the length of the finger when performing an individual impression with the finger vein pattern. An object of the present invention is to provide a vein pattern input device and a personal authentication device using the same.

The present invention includes a main body, finger placement means including a finger tip placement base and a finger base placement base installed on the main body, and an internal wall surface of the main body, and placed on the finger tip placement base and the finger root placement base. In a finger vein pattern input device of a personal authentication device comprising: an irradiating means for irradiating light with a finger; and an imaging means for capturing the light-irradiated finger incorporated in the main body,
The finger tip placement table includes a fingertip guide, and is slidable toward the finger base placement table along an inner wall surface of a main body.

The present invention also provides a main body, finger placement means comprising a finger tip placement base and a finger base placement base installed on the main body, irradiation means for irradiating light on a biological finger, and transmission from the biological finger. An imaging unit that detects light by detecting light, a vein pattern extraction unit that extracts a vein pattern from an image acquired by the imaging unit, and an image that compares the extracted vein pattern with a previously registered vein pattern In a personal authentication device with a vein pattern having a computing means,
The finger tip mounting table includes a fingertip guide, is slidable toward the finger base mounting table along the inner wall surface of the main body, and is provided with position detection means for detecting the position of the fingertip guide. There is provided a personal authentication device using a vein pattern, characterized in that it has comparison means for comparing the position of a fingertip guide with the position of a fingertip guide registered in advance, and has output means for outputting the comparison result.

  According to the present invention, as described above, the finger tip mounting base includes a fingertip guide and is slidable toward the finger base mounting base along the inner wall surface of the main body. It is possible to provide a personal authentication device capable of collating a finger vein pattern detected in consideration of the length of a finger and a finger vein pattern registered in advance.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a cross section in a lateral direction of a finger vein pattern input device constituting a personal authentication device according to the present invention, and FIG. 2 shows a side view.

  The finger vein pattern input apparatus 101 includes a control module unit (control module unit) 1 and an imaging unit (imaging unit) 2 that incorporate a CPU that performs image processing. As is well known, the control module unit 1 compares a vein pattern extraction unit that extracts a vein pattern (finger vein pattern) from an image acquired by the imaging unit 2 with a vein pattern registered in advance with the extracted vein pattern. That is, it has an image calculation means for collation and is built in the main body 10 (imaging base). The control module unit 1 is fixed on all sides by a holding body 21. By removing the holding body 21, the control module unit 1 can be easily converted, and the difference in control applications can be easily dealt with.

  In addition, the imaging unit 2 is built in the main body 10. In FIG. 1, 11 indicates a finger as a part of a living body. This finger may be a first finger or a second finger. In addition, an ellipse shows a fingernail. The imaging unit 2 includes an irradiation unit (irradiation unit) 13 (13A, 13B), a finger detection sensor 14 (14A, 14B), and a finger placement unit 15 that are disposed facing each other with the space unit 12 in the upper part of the main body 10. And a cradle 16, a camera module 17, and an optical axis refracting unit 18. The optical axis refracting unit 18 is for increasing the optical path length of imaging while reducing the height of the entire apparatus and reducing image distortion.

  The camera module 17 is held in the main body 10 by an adjustable screw 22 so that the position can be shifted, and the center of the imaging unit and the center of the camera module can be aligned. A soft rubber 25 is provided between the camera lens 24 of the camera module 17 and the main body 10 to prevent unnecessary light from entering.

  Small space portions 31 (31A, 31B) are provided on both sides of the upper part of the main body. The small space portion 31 is provided with an irradiation unit as a light source for irradiating light on the upper side and a finger detection sensor 14 on the lower side. In addition, slits 32 and 33 pierced toward the finger 11 are provided toward the space portion 12, and a cover 34 is provided in the slit 32.

  The finger detection sensor 14 detects that the finger 11 has approached and that the finger has been set, and transmits a detection signal to the control module unit. The registration process and the setting determination process can be started when the finger detection sensor 14 confirms that the finger 11 has been set in a non-moving state. The inner wall surface 41 (41A, 41B) of the main body 10 forming the space portion 12 is formed with a smooth inclined surface in a direction narrowing in all directions, and the finger placement means 15 is placed thereon.

  In FIG. 2, the main body 10 includes a main body cover 51, the small space portion 31 described above is formed by the main body cover 51, and the slit 32 is formed in the main body cover 51. The finger placement means 15 includes a finger tip portion placement base 52 and a fixed finger base portion placement base 53 provided at a front portion in the insertion direction of the finger 11, both of which are arranged with a space therebetween, facing the space described above. Slits 32 and 33 are provided. That is, the image of the vein of the part of the finger 11 placed in this space is taken by the camera module 17. An image signal is acquired by this imaging.

The finger tip portion mounting table 52 includes a fingertip guide 54 integrated therein, guiding the finger tip portion therein, and when the finger 11 is placed on the finger tip portion mounting table 52 and the finger base portion mounting table 53, Has the function of positioning and stabilizing.
In addition, a guide lamp 55 for guiding and displaying the authentication result is provided.

  In FIG. 1, the finger placing means 15 shows a finger tip placement table 52, which is formed in a rounded concave shape so that the surface fits the finger 11, and both side surfaces are internal wall surfaces. The bottom surface is guided by the cradle 16.

  A moving knob 56 that projects through the main body 10, that is, the main body cover 51, that is, through the slit-like through hole 57, is connected to the finger tip portion mounting base 52. Therefore, by operating the movement knob 56, the finger tip portion mounting base 52 can be slid along the inner wall surface 41 and moved. The moving position of the moving knob 56 can be detected by position detecting means 58 attached to the main body cover 51, and this detected value can be input to the control module unit 1. The position detection may be performed electronically and automatically input to the control module unit 1. In this manner, the detected position of the fingertip guide 54 can be compared with the position of the fingertip guide registered in advance at the time of registration. That is, both comparison means are formed in the image calculation unit 132 described later. When a signal matching the two is output by this comparison, imaging of the finger by the imaging unit 2, that is, the camera module 17, is started. The position verification of the fingertip guide 54 is equivalent to the position verification of the finger tip portion mounting base 52 or the moving knob 56. Alternatively, the finger position may be detected by taking an image. The position of the finger corresponding to any finger length is detected and adopted as an important element in the registration process and the authorization determination process.

  FIG. 3 illustrates that the fingertip guide 54 is slid by the moving knob 56 in accordance with the length of the finger, that is, the size, so that the imaging by the imaging unit 2 is reliably and stably performed. In FIG. 3, when the finger 11 is an L size (the longest finger, for example, an adult male finger), the fingertip guide 54 has almost reached the position of the most forward end. When the finger 11 is a person of M size, the fingertip guide 54 is in an intermediate position, and in the case of S size (the shortest finger, for example, a child girl's finger), the fingertip guide 54 is almost at the position of the most rearward end. It will retreat. A sliding length of 4 to 8 cm is sufficient. These positions are measured by setting stages, and are registered in the control module unit 1 as detection values. It is also measured at the time of authentication determination, and the detected value is compared with the registered position, and the finger placement position is guided to the registration position.

FIG. 4 shows a block diagram of an embodiment of the present invention.
4, the personal authentication device 200 includes an image input device, an operation input device 102, an image processing unit (image processing means) 103, a storage unit 104, a display device 105, and the like corresponding to the finger vein pattern input device 101 in FIG. Output device 106. The finger vein pattern input device 101 includes an irradiation unit (irradiation unit) 13, a finger placement unit 15 on which the finger 11 is placed, and a camera module 17, and places the finger 11 on an individual to be authenticated according to an instruction from the operation input device 102. The light is emitted from the irradiating unit 13 and the finger vein pattern of the finger is imaged by the camera module 17 using the transmitted light. In the storage unit 104, the vein pattern obtained by using the finger vein pattern input device 101 described above and the position of the fingertip guide 54 when the individual finger vein pattern to be authenticated is captured in association with the ID number are associated with each other. Remembered. You may make it memorize | store the imaging information acquired by imaging with another apparatus.

  The image processing unit 103 includes a finger vein pattern extraction unit (means) 131, an image calculation unit (means) 132, and an output unit (means) 133. The image processing unit 103 captures the finger vein imaged and acquired by the camera module 17. Information is input, and a finger vein pattern extraction unit (means) 131 extracts a characteristic pattern of an individual finger vein for which authentication is requested according to a predetermined method.

  The image calculation unit 132 compares the extracted vein pattern with the vein pattern registered in the storage unit (storage unit) 104 and the position of the fingertip guide 54 in advance. From the comparison between the extracted vein pattern and the registered vein pattern, the identity of both is determined. That is, the image calculation unit 132 functions as an identity determination unit based on image comparison (also a feature item comparison), and can instantaneously determine identity. The identity determination includes the concept of being identical, not identical, and impossible to judge.

  The above determination result is transmitted to the output unit 133. The output instruction from the output unit 133 is divided into two. One of them is transmitted to the display device (display unit) 105.

  The display device 105 includes a screen display unit 151 and a voice display unit 152, and the authentication result can be displayed on the screen and by voice. When both are not required, one display unit may be provided. The screen display unit 151 and the audio display unit 152 are preferably provided in the vicinity of the finger vein pattern input device (image input device) 101. The display result naturally includes a display indicating that the user has been authenticated and that the user cannot be authenticated, but also includes a display in the next step based on the premise of authentication.

  When the image calculation unit 132 performs identity determination based on image comparison, ID numbers are collated. As described above, the position of the fingertip guide 54 when the finger 11 is placed on the finger placement unit 15 is determined. It is determined whether or not the position of the fingertip guide 54 detected and registered in advance is substantially the same. If they are determined to be the same, the authentication process is continued, but the position of the fingertip guide 54 associated with the ID number or the registered finger vein pattern associated with the ID number is registered and the authentication determination process. If it is determined that they do not coincide with each other, they do not coincide with the display device 105, so guidance is provided so that the finger 11 is placed at any position of L size, M size, or S size.

  When an individual who seeks authentication in accordance with this guidance operates the fingertip guide operation unit 156, that is, the movement knob 56, and positions the fingertip guide 54 at the guided position, the position of the fingertip guide 54 becomes the fingertip guide position input unit 157 of the image processing unit 103. As described above based on this position, the detected position of the fingertip guide 54 is compared with the position of the registered fingertip guide, and if it is determined that they are substantially the same, an authentication determination process is performed. The If they do not match, guidance is given again.

  In FIG. 4, the position of the fingertip guide operation unit 156 is automatically detected and input to the fingertip guide position input unit 157, but the observation value observed by the eyes is subjected to image processing by the operation input device 102. The information may be input to the fingertip guide position input unit 157 of the unit 103. When this method is used, it takes a little extra time, but the authentication device 100 or the finger vein pattern input device 101 can be reduced in size and simplified.

  FIG. 5 shows finger vein template data. A finger vein pattern and a fingertip guide position (for example, L, M, S) are registered as finger vein template data for each individual with an ID number.

FIG. 6 shows a flow of the authentication determination process.
In FIG. 6, it is determined whether an ID number has been input (S11). When the ID number is input, vein pattern information corresponding to the ID number and the position of the attached fingertip guide are read (S12). Next, the position is detected from position detection means, that is, a finger vein sensor, and the position of the fingertip guide is input. In this case, automatic detection may be performed and automatic input may be performed.

  Next, it is determined whether or not the position of the fingertip guide registered in addition to the vein pattern information is the same as the detected current position of the fingertip guide (S14). Read (S15). In the case of No, an announcement, that is, guidance display is performed so that the position of the fingertip guide matches the position at the time of registration (S16). Repeat this.

  When the finger vein pattern is read (S15), it is determined whether the vein pattern in which the registered finger vein pattern of the input ID number is detected matches (S17), and an authentication failure is announced (S18). This is announced (S19).

As described above, the main body 10, the finger placement means 15 including the finger tip placement base 52 and the finger base placement base 53 installed in the main body 10, and the irradiation unit 13 that irradiates the living body finger 11 with light. The camera module 17 that detects the transmitted light from the finger 11 of the living body and images the veins, the finger vein pattern extraction unit 131 that extracts the vein pattern from the image acquired by the camera module 17, and the extracted vein pattern In the personal authentication method by the personal authentication device 200 by the vein pattern having the image calculation unit (means) 132 for comparing the vein pattern registered in advance,
The finger tip placement base 52 is provided with a fingertip guide 54, which is slidable toward the finger base placement base 53 along the inner wall surface 41 of the main body 10, detects the position of the fingertip guide 54, and detects the detected fingertip guide 54. The position is compared with the position of the fingertip guide registered in advance, and when the position is different due to the comparison, a display for guiding the position of the fingertip guide 54 to move to the registered position is performed. When the coincidence signal is output, a personal authentication method is configured such that the finger illuminated by the camera module 17 is imaged.

Sectional drawing which shows the structure of the finger vein pattern input device of the Example of this invention. The side view of FIG. A state in which the fingertip guide moves to a predetermined position corresponding to the size of the finger is shown. The figure which shows the structure of the Example of this invention with a block. The figure which shows the data of a finger vein template. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Control module part, 2 ... Imaging part (imaging means), 11 ... Finger, 12 ... Space part, 13 ... Irradiation part (irradiation means), 14 ... Finger detection sensor, 15 ... Finger placement means, 16 ... Receiving base, DESCRIPTION OF SYMBOLS 17 ... Camera module, 31 ... Small space part, 32, 33 ... Slit, 41 ... Internal wall surface, 51 ... Main body cover, 52 ... Finger tip part mounting base, 53 ... Finger root part mounting base, 54 ... Finger tip guide, 56 ... Moving knob , 57... Slit-like through hole, 58... Position detecting means, 101... Finger vein pattern input device, and 200.

Claims (3)

A main body, a finger placement means composed of a finger tip placement base and a finger base placement base installed on the main body, an irradiation means for irradiating light on the biological finger, and transmitted light from the biological finger is detected. An imaging means for imaging a vein, a vein pattern extraction means for extracting a vein pattern from an image acquired by the imaging means, and an image calculation means for comparing the extracted vein pattern with a previously registered vein pattern In a personal authentication device with a vein pattern,
The finger tip mounting table includes a fingertip guide, is slidable toward the finger base mounting table along the inner wall surface of the main body, and is provided with position detection means for detecting the position of the fingertip guide. A personal authentication device based on a vein pattern, comprising: a comparison unit that compares a position of a fingertip guide with a position of a fingertip guide registered in advance; and an output unit that outputs a comparison result.   2. The personal authentication using a vein pattern according to claim 1, further comprising display means for performing a display for guiding the position of the fingertip guide to move to a registered position when both positions differ due to the comparison. apparatus.   3. The personal authentication device according to claim 2, wherein when the coincidence signal in which both positions coincide with each other is output by the comparison, the finger irradiated with light is imaged by the imaging unit.

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