JP2009042857A - Personal authentication equipment and personal authentication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a personal authentication equipment using a vein pattern for achieving personal authentication without generating any problem even when a near-infrared emission LED is not used by reducing the influence of interference rays of light when the rays of light under sunlight or the rays of light of a surrounding environment are strong. <P>SOLUTION: The fingers or palm of the hand are placed on a finger placement stand, and external rays of light in which near-infrared light components are sufficiently included while the light source of the sunlight or a surrounding environment is strong are received from the outside, and diffused and transmitted by a diffusion cover, and the external rays of light diffused and transmitted by the diffusion cover are used as a light source, and the external rays of light transmitted through the fingers or palm of the hand are received as detection rays of light, and the near-infrared external rays of light are transmitted by a near-infrared transmission filter, and the vein pattern of the fingers or palm of the hand is imaged by the near-infrared rays of light narrowed down by the infrared transmission filter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vein authentication apparatus using a vein pattern as a biometric feature for identifying an individual, that is, a personal authentication apparatus and a personal authentication method using the same.

  As a vein authentication device using a vein pattern, an apparatus using a finger vein pattern or a palm vein pattern is known.

  The finger vein authentication device includes a near-infrared light source, an optical filter that transmits only near-infrared light, a camera that is sensitive to near-infrared light, and a calculation unit that processes and collates finger vein images from the camera. . When a finger is imaged using near-infrared light as a light source, components in blood absorb the near-infrared light well, so that light in the blood vessel portion does not transmit and appears dark. Therefore, when a finger is inserted between the near-infrared light source of the finger vein authentication device and the camera, a vein pattern in the finger can be imaged. The vein pattern in the finger imaged in this way is collated with a registered vein pattern to perform personal authentication.

  Usually, near-infrared light emitting LEDs are used as near-infrared light. The camera for imaging uses a camera having sensitivity in the near infrared region, and an optical filter that transmits only near infrared light is attached in front of the camera to capture the vein pattern in the finger with good contrast.

  When such an apparatus is used outdoors, particularly when used outdoors during the daytime, it is necessary to make the apparatus unaffected by disturbing light other than near-infrared light sources, particularly sunlight. In general, an optical shielding unit that blocks external light entering the imaging unit, such as 1 and 2, is prepared.

  Patent Documents 3 and 4 describe a compact authentication device that is resistant to external light.

JP 2005-128936 A JP 2005-327892 A JP 2004-265269 A JP 2005-25307 A

  When performing personal authentication with a finger vein authentication device outdoors or the like, shielding of light (interfering light) from other than the near-infrared light source to be used is a big problem. When sunlight leaks into the optical system of the finger vein authentication device or the target finger, the intensity of sunlight and near-infrared light source is generally greatly affected by the fact that sunlight is one digit higher in intensity. It becomes difficult to capture a vein image. When using a personal identification device outdoors in the daytime, it is common to use optical shielding to block outside light, but since it is intended for everyone, leakage from the gap part of the finger insertion part or finger Sunlight hits the roots and the like and has the effect of sunlight penetrating the finger, making it a good obstacle to authentication.

  The present invention uses a vein pattern that reduces the influence of interfering light and can authenticate without problems without using a near-infrared light-emitting LED when the sunlight or the ambient light is strong. An object is to provide a personal authentication device.

The present invention relates to a storage unit that stores a vein pattern in advance and a personal authentication device that performs personal authentication by determining the coincidence of the detected vein pattern.
The body,
A subject mounting table for mounting a finger or palm on the main body;
The main body is provided so as to surround the subject mounting table by allowing a finger or palm to be placed on the subject mounting table, and the light source of sunlight or the surrounding environment is strong and has a near infrared light component. A cover that allows external light that is sufficiently contained to be transmitted from the outside and diffuses the transmitted external light, and is a diffusion cover that allows the external light that is diffused and transmitted by the diffusion cover to enter as a light source;
A near-infrared transmission filter that receives external light as detection light that has passed through the finger or the palm in proximity to the subject mounting table and transmits near-infrared light inside the body; and the near-infrared There is provided a personal authentication device comprising: an imaging device that images a vein pattern of a finger or palm with near-infrared light narrowed by a transmission filter.

  The personal authentication apparatus described above is characterized in that an auxiliary light source that assists a white light source or a near-infrared light source is provided inside the diffusion cover so as to face the subject mounting table.

  In the personal authentication device described above, the diffusion cover is a translucent or transparent glass plate, a synthetic resin plate, or a light diffusion film attached to any one of these covers.

  In the above personal authentication device, the diffusion cover includes a plurality of optical fiber light guides in the cover part.

Further, the present invention relates to a personal authentication method by a storage unit that stores a vein pattern in advance and a personal authentication device that performs personal authentication by determining the coincidence of the detected vein pattern.
A finger or palm is placed on the subject mounting table provided in the main body, and the diffuser cover receives sunlight from the outside or diffuses external light containing a sufficient near-infrared light component from the outside. The external light diffused and transmitted by the diffuser cover is used as a light source, and the near-infrared transmission filter receives the external light transmitted through the finger or palm as detection light and transmits the near-infrared light. And providing a personal authentication method characterized in that a finger or palm vein pattern is imaged by near-infrared light focused by the infrared transmission filter.

  The above personal authentication method uses sunlight as a light source when there is a sufficient amount of light to use sunlight as detection light, and assists when the amount of light is not sufficient to use sunlight as detection light. A vein pattern is imaged using a light source.

  The present invention is provided so as to surround the subject mounting table by allowing a finger or palm to be placed on the subject mounting table, and has a strong light source of sunlight or the surrounding environment and sufficiently includes a near infrared light component. A diffusion cover that transmits external light that is transmitted from the outside and diffuses the transmitted external light, and is provided with a diffusion cover that allows the external light diffused and transmitted by the diffusion cover to enter as a light source. In addition, a near-infrared transmission filter that receives external light as detection light transmitted through the finger or palm and transmits near-infrared light is provided near the subject mounting table. Vein pattern authentication is possible without providing an infrared light-emitting LED, and when the ambient light is strong in the sunlight or in the surrounding environment, the above-mentioned external light can be used as a light source and the external light is strong. Also disturb Personal authentication apparatus and personal authentication method of performing authentication without effect becomes small problem can be provided.

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

  FIG. 1 is a front sectional view of a personal authentication device showing a schematic configuration of a first embodiment of the present invention, and FIG. 2 is a side view of FIG.

  In these figures, a personal authentication device 100 is configured as a vein pattern authentication device, and includes a main body 1, a finger rest 2 provided on the upper portion of the main body 1, and a near-infrared transmission filter disposed in the main body facing the finger rest 2. 3. The camera 4 disposed close to the near-infrared transmission filter 3; the image information captured by the camera 4 is input and compared with the finger vein pattern stored in advance in a storage device (not shown); A personal authentication unit 5 that performs personal authentication by determining coincidence and a diffusion cover 6 attached to the main body 1 are provided. An auxiliary near-infrared light source 7 can be attached to the inside of the diffusion cover 6, that is, the inner surface.

  In this embodiment, ambient light such as sunlight or white light is strong, and external light that contains a sufficient amount of near-infrared light components is used as the light source. Normally, a near-infrared light emitting LED is provided. I don't need it. Hereinafter, the case where sunlight as a typical example is used as external light will be described.

  The personal authentication device 100 shown in FIG. 1 is an example of a finger vein authentication device based on finger vein pattern detection, but this embodiment can also be applied to a palm vein authentication device based on palm vein pattern detection. Hereinafter, the finger vein authentication device will be described as an example of the personal authentication device 100.

  In this embodiment, the finger placing table 2 is adopted, but it can be a palm placing table, and these are proved as the subject placing table. However, the placing of the finger or the palm is directly or indirectly placed. In this embodiment, an example in which the finger placement table 2 is provided will be described. Therefore, the human finger 10 to be authenticated is placed on the finger placement table 2, and the finger placement table 2 has a shape suitable for placing the finger 10.

  The main body 1 is configured to shield light, and thus the finger rest 2 is also configured to shield light. For this purpose, the finger placement table 2 is configured as a light shielding plate finger placement table, but both may be configured separately.

  The diffusion cover 6 is provided in the main body 1 so as to surround the finger rest 2 and allows sunlight to be transmitted from the outside and diffuses the transmitted sunlight. By using such a diffusion cover 6, diffused and transmitted sunlight can be made incident as a light source, and a light source is secured by using a special near-infrared light emitting LED as described above. As a material constituting the diffusion cover 6, a synthetic resin plate such as a glass plate, an acrylic plate, or other plastic can be used. In short, a strong, transparent or translucent material plate can be used.

  The diffusion cover 6 can have a configuration suitable for placing the finger 10, for example, a depth semi-cylindrical shape as shown in the drawing, and a front semi-spherical shape, but is not limited to these shapes, and has a similar shape It can be. The diffusion cover 6 surrounds the finger rest 2 and has a configuration and structure that surrounds the finger 10 when the finger 10 is placed.

  A typical example of the diffusion cover 6 is a diffusion cover made of transparent glass or acrylic resin having irregularities on the surface. In this case, a translucent or transparent diffusion cover made of glass or acrylic resin can be used.

  The diffusion cover 6 includes a layer composed of a resin composition composed of a styrene resin and a light diffusing agent, a layer composed of an acrylate ester, and a laminate composed of an acrylate ester-based and styrene copolymer resin layer containing an ultraviolet absorber. Can be configured as a body. The light diffusing agent is not particularly limited as long as it is generally used for a light diffusing plate. For example, inorganic transparent fine particles that can be used as a light diffusing agent include calcium carbonate, barium sulfate, titanium oxide, aluminum hydroxide, silica, glass, talc (registered trademark), mica, magnesium oxide, and zinc oxide. Can be mentioned. The surface treatment may be performed using a fatty acid, a silicone coupling agent, or a titanate coupling agent. Moreover, you may use the light-diffusion agent which performs organic type | system | group transparent fine particles, such as a styrene type crosslinked fine particle and an acrylic type crosslinked fine particle.

  The diffusion cover may be a translucent or transparent substrate with a light diffusion plate film attached thereto, or a light diffusion layer forming coating solution applied and solidified. Good.

  In this manner, the diffusion cover 6 is an optical diffusion cover that does not capture the sun or surrounding scenery, and is configured as a diffusion cover that can be used as a light source that averages sunlight. In this configuration, sunlight is used as a light source.

  Sunlight that has passed through the finger 10 is focused only on near-infrared light by the near-infrared transmission filter 3 and imaged by the camera 4. Thus, the camera 4 constitutes an imaging device.

  The camera 4 can be electronically or mechanically apertured, and can be imaged with sunlight so that the brightness can be adjusted by the camera gain adjustment mechanism.

  The image information about the captured image is compared with the personal image information stored in advance in the storage device in the personal authentication unit 5 to determine the coincidence (determination means), and the personal authentication is performed by the finger vein pattern. As a signal. On the inner side of the diffusing cover 6, that is, on the inner wall of the diffusing cover 6, an auxiliary light source that assists a white light source or a near-infrared light source is provided in the longitudinal direction of the finger 10 so as to face the finger placing table 2. In the case of the present embodiment, the auxiliary near infrared light source 7 is provided in the longitudinal direction of the finger 10. When there is no sunlight, the auxiliary near infrared light source 7 is turned on as a light source, and a finger vein pattern is imaged.

  When the sunlight intensity is sufficient outdoors, the finger vein pattern is imaged using near-infrared light in sunlight as a light source, and the built-in auxiliary near-infrared light source is used at night, twilight, and other times when the sunlight intensity is low. The finger vein pattern used is imaged. Since sunlight itself is used as a light source, the influence of sunlight interference light from the diffusion cover 6 as a sunlight light source part, the gap of the finger insertion part or the base of the finger is almost eliminated.

  Assuming that the intensity of the interference light is A and the influence degree when the interference light hits the leak from the gap portion of the finger insertion part or the base of the finger is B, the total influence degree is expressed as A * B. For example, B is calculated as 0.5.

  If the intensity of sunlight is now 1, the intensity of interfering light is 0.5. Therefore, SN in the case of exposure with sunlight is 1: 0.5. When a near-infrared LED light source having 1/10 the intensity of sunlight is used, SN is 1: 5. Therefore, it can be seen that if sunlight is used as the light source, the influence of the interference by sunlight is small. In this way, finger vein authentication can be performed without problems under sunlight. When there is no sunlight, finger vein authentication is performed using an auxiliary near-infrared light source. However, since there is no sunlight as interference light, finger vein authentication is possible without any problem. Finger vein authentication is possible without any problem because there is interference light with high intensity other than sunlight because it operates according to sunlight.

  FIG. 3 is a front view showing a schematic configuration of the second embodiment of the present invention, and corresponds to FIG. 1 of the first embodiment. The same number is attached | subjected about the structure same as a 1st Example, The description described in the 1st Example is used.

When there is no sunlight, the auxiliary near-infrared light source 7 is turned on as a light source and the finger vein pattern is imaged as in the previous embodiment. In this example, a large number of optical fiber light guides 8 are formed in the upper cover 9, and the diffusion cover 6 is formed by the upper cover and the light guide 8.
The upper cover 9 surrounds the finger rest 2. The upper cover 9 may be non-transparent.

  The light guide path 8 is provided with an entrance portion 11 at various locations on the upper cover 9, and an exit portion 12 is provided so as to irradiate the upper surface of the finger 10. The exit portions 12 of the light guide paths 8 are concentrated on the upper surface of the finger 10. Is done. With such a configuration, it is possible to irradiate the upper surface of the finger 10 with sunlight introduced from the left and right horizontal directions and the vertical direction at the top.

  As described above, the light guide path 8 is made of a transparent material, and a light diffusion function is obtained by using a large number of light guide paths 8, and a large number of light guide paths 8 are provided on the upper cover. However, the diffusion cover 6 can be formed as in the first embodiment.

  As described above, when sunlight that has been conventionally regarded as disturbing light is used as a light source, the influence when the disturbing light hits the leak from the gap portion of the finger insertion portion or the base of the finger is similar to that of the light source. The finger vein authentication is possible without any problem because it is about 1/10 that of using an infrared LED. In this way, it is possible to provide a finger vein authentication device that can be installed outdoors by using sunlight as sunlight and using the auxiliary near infrared light source 7 as an imaging light source when there is no sunlight.

1 is a front sectional view showing a schematic configuration of a first embodiment of the present invention. The side view of FIG. Front sectional drawing which shows schematic structure of the 2nd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Finger placement stand, 3 ... Near-infrared transmission filter, 4 ... Camera (imaging device), 5 ... Personal authentication part, 6 ... Diffusing cover, 7 ... Auxiliary near-infrared light source, 8 ... Optical fiber guide Optical path, 9 ... upper cover, 10 ... finger, 11 ... entrance, 12 ... exit, 100 ... personal authentication device (finger vein authentication device).

Claims (6)

In a storage unit that stores a vein pattern in advance and a personal authentication device that performs personal authentication by determining the coincidence of the detected vein pattern,
The body,
A subject mounting table for mounting a finger or palm on the main body;
The main body is provided so as to surround the subject mounting table by allowing a finger or palm to be placed on the subject mounting table, and the light source of sunlight or the surrounding environment is strong and has a near infrared light component. A diffusion cover that transmits external light that is sufficiently contained from the outside and diffuses the transmitted external light, and diffuses the external light that is diffused and transmitted by the diffusion cover as a light source;
A near-infrared transmission filter that receives external light as detection light that has passed through the finger or the palm in proximity to the subject mounting table and transmits near-infrared light inside the body; and the near-infrared A personal authentication device, comprising: an imaging device that images a finger or palm vein pattern with near-infrared light narrowed by a transmission filter.   The personal authentication apparatus according to claim 1, wherein an auxiliary light source that assists a white light source or a near-infrared light source is provided inside the diffusion cover so as to face the subject mounting table.   2. The personal authentication apparatus according to claim 1, wherein the diffusion cover is a translucent or transparent glass plate, a synthetic resin plate, or a light diffusion film attached to any one of these covers.   The personal authentication device according to claim 1, wherein the diffusion cover includes a plurality of optical fiber light guides in a cover portion. In a personal authentication method by a personal authentication device that performs personal authentication by determining the coincidence between a storage unit that stores a vein pattern in advance and a detected vein pattern,
A finger or palm is placed on the subject mounting table provided in the main body, and the diffuser cover receives sunlight from the outside or diffuses external light containing a sufficient near-infrared light component from the outside. The external light diffused and transmitted by the diffuser cover is used as a light source, and the near-infrared transmission filter receives the external light transmitted through the finger or palm as detection light and transmits the near-infrared light. And imaging a vein pattern of a finger or palm with near-infrared light focused by the infrared transmission filter.   In claim 5, when there is a sufficient amount of light to use sunlight as detection light, sunlight is used as a light source, and when there is no sufficient amount of light to use sunlight as detection light, an auxiliary light source is used. A personal authentication method, wherein a vein pattern is imaged using the personal authentication method.

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