JP5229490B2 - Biometric authentication device - Google Patents

Biometric authentication device Download PDF

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JP5229490B2
JP5229490B2 JP2009064729A JP2009064729A JP5229490B2 JP 5229490 B2 JP5229490 B2 JP 5229490B2 JP 2009064729 A JP2009064729 A JP 2009064729A JP 2009064729 A JP2009064729 A JP 2009064729A JP 5229490 B2 JP5229490 B2 JP 5229490B2
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image
authentication
vein
fingerprint
finger
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JP2010218259A (en
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展弘 森田
祐治 山中
順 渡部
伸 青木
哲哉 佐々木
茂 大内田
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株式会社リコー
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  The present invention relates to a biometric authentication apparatus capable of both vein authentication and fingerprint authentication.

  Patent Document 1 discloses an apparatus that integrates a finger vein image input unit, a palm vein image input unit, and a fingerprint image input unit, acquires authentication data corresponding to already registered authentication data, and performs authentication. ing.

  Japanese Patent Application Laid-Open No. 2004-228561 has a case that is integrally provided with a fingerprint image reading unit and a finger vein pattern image reading unit, and by devising the shape of this case, an apparatus that allows a user to perform an authentication operation in a relaxed state Is disclosed.

  Patent Document 3 discloses a vein illumination device that illuminates from above a finger placed on a transparent plate, a fingerprint illumination device that illuminates from below the transparent plate, and focuses on both finger veins and fingerprints from below the transparent plate. An apparatus capable of performing vein authentication and fingerprint authentication is disclosed, which includes an imaging apparatus capable of capturing images together.

  In Patent Document 4, by operating a light source switching unit, a finger vein image is captured by irradiating a finger with near infrared light, a finger dermis image is captured by irradiating a finger with red light, and vein authentication is performed. A biometric authentication device capable of both fingerprint authentication is disclosed.

  By the way, in a biometric authentication device mounted on a small device such as a mobile device, it is important to reduce the size and thickness. In addition, in order to improve the security strength of a device equipped with a biometric authentication device, it is convenient if a single biometric authentication device can handle both vein authentication and fingerprint authentication. This is the versatility of the biometric authentication device. This is also advantageous.

  Prior arts that enable fingerprint authentication and vein authentication using the same device are disclosed in Patent Documents 1 to 4. However, since the devices of Patent Documents 1 to 3 use a monocular lens, there is a limit due to the back focus of the lens even if it is attempted to reduce the size and thickness, and the device is small enough to be mounted on a mobile device.・ It is difficult to reduce the thickness.

  Moreover, the apparatus of patent document 4 is a structure suitable for thickness reduction using a lens array. However, since the finger is brought into contact with or close to the lens array, an image of a wide range of the finger is necessary (the vein is sparse, so it is necessary to image a relatively wide range of the finger). The apparatus cost increases due to the need for a large and expensive image sensor, and even if the apparatus can be thinned, it is difficult to reduce the size. Furthermore, it is necessary to perform a switch operation for switching between vein authentication and fingerprint authentication, and it is also necessary to provide means such as a switch for that purpose.

  The present invention has been made in view of the above-described problems of the prior art, and can be used with an inexpensive image pickup device having a small image pickup area, and can be easily reduced in cost, thinned, and downsized. Another object of the present invention is to provide a biometric authentication device that can switch between vein authentication and fingerprint authentication without performing a special switch operation.

The biometric authentication device according to the invention of claim 1
A lens array in which a plurality of lenses are arrayed, illumination means for irradiating illumination light to a finger held in the field of view of the lens array, and an image formed by the lenses of the lens array. Provided on the image plane side of the lens array that captures a compound eye image that is a collection of a reduced image of a fingerprint of a finger held over the field of view and a reduced image of a vein (hereinafter referred to collectively as a single-eye image). An image input device that inputs the compound eye image in a non-contact manner with a finger held in the field of view of the lens array;
Vein authentication means for performing personal authentication using a reduced vein image in a compound eye image input by the image input device;
Fingerprint authentication means for performing personal authentication using a reduced fingerprint image in a compound eye image input by the image input device;
Parallax detection means for detecting parallax between single-eye images in a compound eye image input by the image input device;
When the parallax detected by the parallax detection means is within a predetermined range for vein authentication, the personal authentication by the vein authentication means is validated, and when the parallax is within a predetermined range for fingerprint authentication, the fingerprint authentication means And an authentication switching means for validating personal authentication according to the above.

  According to a second aspect of the present invention, in the biometric authentication device according to the first aspect of the present invention, the illumination light irradiated by the illumination means is linearly polarized light in a predetermined polarization direction, and the image input device is a fingerprint in the lens array. And having an analyzer that allows only a polarized component in a direction parallel to the predetermined polarization direction to pass on the object side or the image plane side of a lens for forming a reduced image.

  According to a third aspect of the present invention, in the biometric authentication device according to the second aspect of the present invention, the reduced fingerprint image in the compound eye image is obtained from the pixel value of the reduced vein image in the compound eye image input by the image input device. And a calculating means for performing a correction calculation for subtracting the corresponding pixel value, and the vein reduced image after the correction calculation by the calculation means is used for the vein authentication means.

  In the biometric authentication device according to the first aspect of the present invention, the image input device uses a reduction optical system including a lens array, and does not contact a finger held in the field of view of the lens array, and the vein reduced image and fingerprint of the finger Since a compound eye image, which is a set of reduced images, is captured and input, a sufficiently wide range of vein images of the finger can be input using an inexpensive image sensor with a small imaging area, and the device is thin while reducing the cost of the device.・ Achieving miniaturization. In addition, since vein authentication and fingerprint authentication are switched according to the parallax between the single-eye images in the compound eye image (which has a relationship inversely proportional to the subject distance), the distance in the optical axis direction between the finger and the lens array is selected. It is possible to select vein authentication or fingerprint authentication only, and it is excellent in operability because no special switch operation or the like is required. Further, it is not necessary to provide such a switch for switching, which is advantageous in terms of apparatus cost.

  In the biometric authentication device according to the second aspect of the invention, the polarization direction of the illumination light is applied to the object side or the image plane side of the lens for irradiating the finger with linearly polarized light as illumination light and forming a reduced fingerprint image of the lens array. Since the analyzer allows only the polarization component in the direction parallel to the light to pass through, it is possible to input a clear fingerprint reduced image by reflected light near the finger surface, and a highly accurate image using such a fingerprint reduced image can be input. Fingerprint authentication is possible.

  In the biometric authentication device according to the invention of claim 3, by performing a correction operation for subtracting the corresponding pixel value of the clear fingerprint reduced image by the reflected light near the finger surface from the pixel value of the vein reduced image. The effect of reflected light near the finger surface can be removed, and a clear vein reduced image can be obtained by the light reflected and scattered inside the finger. High-accuracy vein authentication using such a vein reduced image is possible. Become.

1 is a configuration explanatory diagram of a biometric authentication apparatus according to an embodiment of the present invention. It is a plane structure explanatory view of an image input device concerning one embodiment of the present invention. It is a flowchart for operation | movement description of the biometrics apparatus which concerns on one Embodiment of this invention.

  FIG. 1 is a diagram illustrating the configuration of a biometric authentication apparatus according to an embodiment of the present invention. This biometric authentication apparatus performs personal authentication by using information on the finger vein or fingerprint of the hand as biometric information. As shown in the figure, the finger vein reduced image and fingerprint in a non-contact state. An image input device 2 for inputting a compound eye image that is a set of reduced images (hereinafter, these reduced images are collectively referred to as single-eye images).

  In FIG. 1, the cross-sectional structure of the image input device 2 is schematically shown. FIG. 2 schematically shows a planar structure of the image input device 2 as viewed from the side facing the finger. The longitudinal direction of the finger corresponds to the left and right direction in FIGS.

  The image input device 2 includes a lens array 3 in which a plurality of imaging lenses are arrayed in a plane substantially orthogonal to the lens optical axis. In the example shown here, as shown in FIG. 2, 6 lenses 4, 5, 6, 7, 8, and 9 are arranged in a 2 × 3 array.

  The image input device 2 includes an image pickup device 10 on the image plane side of the lens array 3 for picking up images that are substantially formed by the lenses 4 to 9. The image pickup device 10 has a large number of pixels two-dimensionally arranged on the image pickup surface 11, and for example, a general CMOS image sensor or CCD image sensor can be used. Since the image input device 2 captures a vein image of the finger 1 away from the lens array 3 or a reduced image of the fingerprint, an inexpensive element having a small imaging surface 11 is used as the image sensor 10, and the finger 1 is placed in the lens array. The image of a sufficiently wide area of the finger 1 can be input as compared with a mode in which an image is captured in a state of being in close contact with or close to 3.

  The image input device 2 also includes a light shielding wall member 12 for preventing crosstalk on the image plane of the light beams that have passed through the lenses 4 to 9. The lens array 3, the light shielding wall member 12, and the image sensor 10 are integrally held by a housing 13.

  The image input device 2 includes an illumination device 17 for irradiating a finger with linearly polarized light in the near infrared band. In the example shown here, the illuminating device 17 uses a near-infrared light emitting diode (LED) 14 as a light source and near-infrared light emitted from the near-infrared LED 14 more efficiently and with a more uniform light amount. The illumination lens 15 provided integrally with the lens array 3 for irradiating the finger with the lens, and the polarizer for converting the near-infrared light that has passed through the illumination lens 15 into linearly polarized light having a predetermined polarization direction. And a polarizing film 16 provided on the lens array. Near-infrared light has a transmissivity for a living body and is absorbed by reduced hemoglobin in blood, which is suitable for inputting a vein image inside a finger.

  As shown in FIG. 2, when the lens array 3 is observed from the side facing the finger, the light-shielding wall member 12 has rectangular areas 24, 25, 26, 27, 28 corresponding to the imaging lenses 4 to 9. , 29. The lens array 3 is provided with a polarizing film 30 as an analyzer that passes only a polarization component in a direction parallel to the polarization direction of the linearly polarized light irradiated by the illumination device 17 in the region 28 corresponding to the lens 8. In addition, a polarizing film 31 as an analyzer that passes only a polarization component in a direction orthogonal to the polarization direction of the linearly polarized light irradiated by the illumination device 17 is provided in a region 29 corresponding to the lens 9.

  Although not shown in FIGS. 1 and 2, regions 24, 26, 27, 28, and 29 corresponding to the lenses 4, 6, 7, 8, and 9 of the lens array 3 are provided on the upper or lower surface of the lens array. A visible light cut filter (or a near-infrared light transmission filter) made of a metal thin film or the like formed on is formed. Note that the region 25 corresponding to the lens 5 is not provided with a visible light cut filter (or near infrared light transmission filter), but this is to make the image by the lens 5 available for detecting the illuminance around the apparatus. It is. If such use is not considered, the same filter may be provided in the region 25 of the lens 5. Further, such a filter may be omitted if the biometric authentication apparatus is used in an environment where there is no possibility of incident visible light. Since each lens for imaging of the lens array 3 is circular, a light-shielding film (not shown) such as a metal thin film for preventing light from entering from a region outside the effective range of each lens for imaging is used. The lens array 3 is formed on the image side surface.

  Note that a similar polarizer or analyzer may be realized by forming a fine structure on the upper surface (object side) or the lower surface (image surface side) of the lens array 3 instead of the polarizing films 16, 30, and 31. Such an embodiment is naturally included in the present invention. Such an embodiment is generally advantageous in terms of production cost and processing accuracy, compared to a mode in which a polarizing film is attached to or applied to the lens array 3.

  With reference to FIG. 1, other components of the biometric authentication device will be described. In FIG. 1, an LED drive unit 41 is means for driving the near-infrared LED 14 of the illumination device 17. The image capture unit 42 captures the image data output from the image sensor 10 and extracts image (single-eye image) data S1, S2, I1, I2, and I3 from the lenses 4, 6, 7, 8, and 9. It is. The image data captured from the image sensor 10 is compound-eye image data in which single-eye images are collected by the lenses 4 to 9, and the periphery of each single-eye image is surrounded by the shadow of the light shielding wall member 12. Therefore, each eye image data can be easily extracted by comparing the pixel value of the compound eye image data with an appropriate threshold value and detecting the shadow portion of the light shielding wall member 12. If the accuracy of the lens pitch of the lens array 3 and the dimension of the light shielding wall member 12 is sufficiently high, a predetermined area may be simply cut out as a single eye image.

  The parallax detection calculation unit 43 calculates the parallax (image shift) between the two eye images from the single eye image data S1 and S2 corresponding to the lenses 4 and 6, and the individual corresponding to the lens 7 based on the parallax. This is a calculation means for calculating the parallax of the individual eye image data I2 and I3 of the lenses 8 and 9 with respect to the eye image data I1. For example, the luminance deviation between the single eye image data S2 of the single eye image data S1 and S2 shifted in the x direction and the y direction and the other single eye image data S1 is obtained. The calculation for obtaining the square sum is repeated while changing the shift amount, and the shift amount in the x direction and the y direction where the square sum of the luminance deviation is minimized is used as the parallax in the x direction and y direction between the individual image data. An operation such as If the parallax between the single-eye image data S1 and S2 is calculated in this way, the parallax of the single-eye image data I2 and I3 with respect to the single-eye image data I1 can be easily calculated based on the lens pitch or the like. it can.

  The parallax adjustment calculation unit 44 performs the parallax adjustment calculation for adjusting the image position so as to cancel the parallax based on the parallax with respect to the single-eye image data I1 of the single-eye image data I2 and I3 calculated by the parallax detection calculation unit 43. This is a means applied to the eye image data I2 and I3. Since such parallax adjustment calculation is performed, normal authentication can be performed even if the distance in the optical axis direction from the lens array 3 to the finger 1 is not constant.

  Now, since there is a relationship between the parallax between single-eye images in the compound eye image and the subject distance, the parallax decreases as the subject distance increases, so what is the subject distance from the detected parallax? Can be determined. When the vein / fingerprint switching unit 45 determines that the parallax between the single-eye image data S1 and S2 calculated by the parallax detection calculation unit 43 is within a predetermined range for vein authentication, in other words, based on the parallax. Thus, when it is determined that the subject distance is within a predetermined range for vein authentication (for example, the finger 1 is at a distance as shown by a solid line in FIG. 1), vein authentication is enabled, and parallax is for fingerprint authentication. In other words, based on the parallax, the subject distance is within the predetermined range for fingerprint authentication (for example, the finger 1 is at a distance as indicated by a broken line in FIG. 1). If it is determined, it is an authentication switching means for enabling fingerprint authentication.

  The correction calculation unit 46 is a unit that performs correction calculation on the individual image data I1 using the individual image data I2 and I3 after the parallax adjustment calculation when the vein authentication is selected by the vein / fingerprint switching unit 45. According to the calculation mode selection signal 47, the first calculation mode or the second calculation mode can be selected. The calculation mode selection signal 47 is set by, for example, operating a switch (not shown) provided in the biometric authentication device, operating a switch provided in a device such as an information terminal equipped with the biometric authentication device, or It is set by a program that runs on the device. When the first calculation mode is selected, the correction calculation unit 46 subtracts the corresponding pixel value of the single-eye image data I2 after the parallax adjustment calculation from each pixel value of the single-eye image data I1 (I1- I2) is performed. When the second calculation mode is selected, the corresponding pixel value of the single-eye image data I2 after the parallax adjustment calculation is subtracted from each pixel value of the single-eye image data I1, and the single eye after the parallax adjustment calculation An operation (I1−I2 + I3) for adding the corresponding pixel values of the image data I3 is performed.

  The selection result by the vein / fingerprint switching unit 45 is also input to the vein verification / registration switching unit 48 and the fingerprint verification / registration switching unit 49. A verification / registration switching signal 50 is also input to the vein verification / registration switching unit 48 and the fingerprint verification / registration switching unit 49. This verification / registration switching signal 50 is set by, for example, an operation of a switch (not shown) provided in the biometric authentication device, an operation of a switch provided in a device such as an information terminal equipped with the biometric authentication device, or Set by a program running on the device.

  When vein authentication is selected by the vein / fingerprint switching unit 45, when the verification / registration switching signal 50 is set to the registration side, the vein verification / registration switching unit 48 outputs the individual eye output from the correction calculation unit 46. The image data ((I1-I2) or (I1-I2 + I3)) is transferred to the vein registration database (DB) 51, and the individual image data is registered as registration data in the vein registration database 51. When the collation / registration switching signal 50 is set to the collation side, the vein collation / registration switching unit 48 outputs the single-eye image data ((I1-I2) or (I1) output from the correction calculation unit 46. -I2 + I3)) is transferred to the vein matching calculation unit 52, and the vein matching calculation unit 52 performs matching calculation (vein authentication) between the individual eye image data and the registration data of the vein registration database 51. That is, the vein matching calculation unit 51 constitutes a vein authentication unit together with the vein registration database 51.

  When fingerprint verification is selected by the vein / fingerprint switching unit 45, when the verification / registration switching signal 50 is set to the registration side, the fingerprint verification / registration switching unit 49 is output from the parallax adjustment calculation unit 44. The eye image data I2 is transferred to the fingerprint registration database (DB) 53, and the individual eye image data is registered as registration data in the fingerprint registration database 53. When the collation / registration switching signal 50 is set to the collation side, the fingerprint collation / registration switching unit 49 transfers the single-eye image data I2 to the fingerprint collation operation unit 54, and the fingerprint collation operation unit 54 The collation operation of the single eye image data and the registration data of the fingerprint registration database 53 is performed. That is, the fingerprint verification calculation unit 54 constitutes a fingerprint authentication unit together with the fingerprint registration database 53.

  In the vein registration database 51, vein feature information such as a branching point coordinate of vein travel extracted from individual eye image data is registered as registration data, and the vein matching operation unit 52 extracts vein feature information extracted from individual eye image data. And the vein feature information registered in the vein registration database 51 may be collated. Similarly, fingerprint feature information extracted from individual eye image data is registered as registration data in the fingerprint registration database 53, and the fingerprint feature information extracted from individual eye image data is registered in the fingerprint registration database 53 in the fingerprint collation operation unit 54. You may make it perform collation calculation with the registered fingerprint characteristic information.

  Each computing unit described above may be realized by hardware, or may be realized by a program using hardware resources such as a microprocessor.

  The authentication / registration operation is started by a start signal 55. The start signal 55 is generated by, for example, an operation of a switch (not illustrated) provided in the biometric authentication device, an operation of a switch provided in a device such as an information terminal equipped with the biometric authentication device, or operates on the device. Occurs in the program that runs.

  FIG. 3 is a flowchart for explaining the overall operation flow of the biometric authentication apparatus. Hereinafter, the operation of the biometric authentication apparatus will be described with reference to FIG.

  When a finger is held over the lens array 3 and a start signal 55 is generated by a switch operation or the like, the operation starts. At this time, when vein authentication is desired, the finger is held relatively far away from the lens array 3 as indicated by a solid line in FIG. 1, and when finger authentication is desired, the finger is indicated by a broken line in FIG. The lens array 3 is held relatively close to it.

  The LED drive unit 41 drives the near infrared LED 14 for a predetermined time to emit light. The finger 1 held over the lens array 3 is irradiated with linearly polarized light in the near-infrared band, and in this state, a compound eye image that is a set of single-eye images by the lenses 4 to 9 is picked up by the image pickup device 10, and the compound eye image data is obtained. The image is captured by the image capture unit 42 (step 1).

  The image capture unit 42 extracts single-eye image data S1, S2, I1, I2, and I3 corresponding to the lenses 4, 6, 7, 8, and 9 from the compound-eye image data (step 2).

  The parallax detection calculation unit 43 calculates the parallax between the single-eye image data S1 and S2, and based on this parallax, calculates the parallax of the single-eye image data I2 and I3 with respect to the single-eye image data I1 (step 3). .

  In the parallax adjustment calculation unit 44, parallax adjustment calculation for canceling the parallax of the single-eye image data I2 and I3 with respect to the single-eye image data I1 is performed on the single-eye image data I2 and I3 (step 4).

  In the vein / fingerprint switching unit 45, either vein authentication or fingerprint authentication is selected based on the parallax between the single-eye image data S1 and S2 (step 5). As described above, the fingerprint authentication is automatically selected by holding the finger relatively close to the lens array 3 as shown by the broken line in FIG. 1, and the finger is considerably separated from the lens array 3 as shown by the solid line in FIG. The vein authentication can be automatically selected by holding it over.

  When fingerprint authentication is selected, the single-eye image data I2 after the parallax adjustment calculation is transferred to the fingerprint collation / registration switching unit 49 through the correction calculation unit 46 (step 6). Then, when the collation / registration switching signal 50 is set to collation (step 7, Yes), the fingerprint collation / registration switching unit 49 performs collation between the individual image data I2 and the registered data by the fingerprint collation calculation unit 54. The calculation is executed (step 8), and if the collation / registration switching signal 50 is set to registration (step 7, No), the individual image data I2 is registered in the fingerprint registration database 53 (step 9).

  When vein authentication is selected by the vein / fingerprint switching unit 45, if the calculation mode selection signal 47 selects the first mode in the correction calculation unit 46 (step 10, first mode), the individual image data I1 Then, a correction calculation is performed to subtract the corresponding pixel value of the single-eye image data I2 from each pixel value, and the corrected single-eye image data is transferred to the vein collation / registration switching unit 48 (step 11). If the calculation mode selection signal 47 selects the second mode (step 10, second mode), the corresponding pixel value of the single-eye image data I2 is subtracted from each pixel value of the single-eye image data I1, and then the individual eye A correction operation for adding the corresponding image values of the image data I3 is performed, and the corrected single-eye image data is transferred to the vein collation / registration switching unit 48 (step 12). Then, if the collation / registration switching signal 50 is set to collation (step 14, Yes), the vein collation / registration switching unit 48 performs collation computation between the individual image data and the registration data in the vein collation calculation unit 52. If the collation / registration switching signal 50 is set to registration (step 13, No), the individual image data is registered in the vein registration database 51 (step 15).

  Now, the illumination light from the illumination device 17 is reflected near the surface of the finger, or enters the inside of the finger and is reflected and scattered by the finger tissue and veins. There are reflected light near the surface of the finger and light reflected and scattered inside the finger. The reflected light near the finger surface is dominated by the polarization component parallel to the polarization direction of the illumination light, while the light reflected and scattered inside the finger has a different polarization direction from the illumination light. The polarization component accounts for a large proportion.

  The polarizing film (analyzer) 30 provided in the region 28 of the lens 8 allows the polarization component in the direction parallel to the polarization direction of the illumination light to pass through, but blocks the passage of the polarization component in the other direction. A clear fingerprint reduced image by the reflected light near the surface is formed by the lens 8, and this is input as the single-eye image data I2. Therefore, high-accuracy fingerprint authentication using such single-eye image data I2 becomes possible.

  On the other hand, the single-eye image data I1 corresponding to the lens 7 is data of a reduced vein image, but since the lens 7 is not provided with an analyzer such as the analyzer 30, it is affected by the reflected light near the finger surface. Is receiving. In particular, when the finger is held away from the lens array 3, the reflected light near the surface of the finger increases compared to the case where the finger is brought into close contact with the lens array 3, and illumination occurs as the finger position changes. The in-plane intensity distribution of the light also changes, but the change in the in-plane intensity distribution is mainly caused by the reflected light near the finger surface, so in the case of vein authentication, the influence of the reflected light near the finger surface is strongly affected. Easy to receive. However, by the correction calculation in the first or second calculation mode by the correction calculation unit 46, the influence of the reflected light on the finger surface is effectively eliminated, and a clear finger vein image by the light reflected and scattered inside the finger is obtained. Since data can be acquired, highly accurate vein authentication can be performed using this data.

  A polarizing film (analyzer) 31 provided in correspondence with the lens 9 allows only a polarization component in a direction orthogonal to the polarization direction of the illumination light to pass, and this passing polarization component is a straight line applied to the finger. This is a component in which polarized light is reflected by the finger vein and the polarization direction is greatly changed. Therefore, when the correction calculation unit 46 performs the correction calculation in the second calculation mode in which the pixel values of the single-eye image data I3 corresponding to the lens 9 are added, the finger vein image data in which the edge of the vein is emphasized Can be obtained. In some cases, it is more advantageous in terms of the accuracy of vein authentication to use a finger vein image in which such an edge is emphasized.

  In addition, the polarizing film 31 as an analyzer should just pass the polarization component of the non-parallel direction with the polarization direction of illumination light, and the polarization direction does not necessarily need to be a direction orthogonal to the polarization direction of illumination light. .

DESCRIPTION OF SYMBOLS 1 Finger 2 Image input device 3 Lens array 4-9 Lens 10 for imaging 10 Imaging element 11 Imaging surface 12 Light-shielding wall member 13 Case 14 Near-infrared light emitting diode (LED)
15 Illumination lens 16 Polarizing film (polarizer)
17 Illuminator 30, 31 Polarizing film (analyzer)
41 LED drive unit 42 image capture unit 43 parallax detection calculation unit 44 parallax adjustment calculation unit 45 vein / fingerprint switching unit 46 correction calculation unit 48 vein verification / registration switching unit 49 fingerprint verification / registration switching unit 51 vein registration database (DB)
52 Vein verification operation unit 53 Fingerprint registration database (DB)
54 Fingerprint verification operation unit

JP 2006-331239 A JP 2008-102728 A JP 2007-175250 A JP 2008-212311 A

Claims (3)

  1. A lens array in which a plurality of lenses are arrayed, illumination means for irradiating illumination light to a finger held in the field of view of the lens array, and an image formed by the lenses of the lens array. Provided on the image plane side of the lens array that captures a compound eye image that is a collection of a reduced image of a fingerprint of a finger held over the field of view and a reduced image of a vein (hereinafter referred to collectively as a single-eye image). An image input device that inputs the compound eye image in a non-contact manner with a finger held in the field of view of the lens array;
    Vein authentication means for performing personal authentication using a reduced vein image in a compound eye image input by the image input device;
    Fingerprint authentication means for performing personal authentication using a reduced fingerprint image in a compound eye image input by the image input device;
    Parallax detection means for detecting parallax between single-eye images in a compound eye image input by the image input device;
    When the parallax detected by the parallax detection means is within a predetermined range for vein authentication, the personal authentication by the vein authentication means is validated, and when the parallax is within a predetermined range for fingerprint authentication, the fingerprint authentication means A biometric authentication device comprising: an authentication switching means for validating personal authentication according to the above.
  2. The illumination light irradiated by the illumination means is linearly polarized light in a predetermined polarization direction,
    The image input device includes an analyzer that allows only a polarization component in a direction parallel to the predetermined polarization direction to pass on an object side or an image plane side of a lens for forming a reduced fingerprint image in the lens array. The biometric authentication device according to claim 1.
  3.   Computation means for performing a correction operation for subtracting the corresponding pixel value of the fingerprint reduced image in the compound eye image from the pixel value of the vein reduced image in the compound eye image input by the image input device, 3. The biometric authentication apparatus according to claim 2, wherein a reduced vein image after the correction calculation is used for the vein authentication means.
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