KR101040750B1 - Apparatus for personal identification - Google Patents

Abstract

The present invention includes a light source for projecting light with a finger and a camera for photographing light passing through the finger, and a photographing apparatus for photographing a blood vessel pattern of a finger in at least two directions, and comparing the photographed blood vessel pattern with stored blood vessel pattern data. It provides a personal recognition device comprising a computing device to identify the user by. Through such a configuration, since an individual can be identified and authenticated by comparing blood vessel patterns of fingers taken in at least two directions or more, the recognition rate and security of the personal recognition device can be further improved.

Personal Identification, Authentication, Security, Vessel Pattern, Infrared

Description

Personal recognition device {APPARATUS FOR PERSONAL IDENTIFICATION}

The present invention relates to a personal recognition device using raw vegetables, and more particularly, to a personal recognition device using a blood vessel pattern of a finger.

Recently, in order to control the use of a network system or access to a building, a biometric technology for identifying authorized individuals has been developed and developed. A personal recognition device using biometric technology performs authentication processing or identification processing using different physical characteristics for each individual such as fingerprint, iris, voice, or the back of a hand or vein of a finger.

A personal recognition device using a voice, a face, or a fingerprint has an advantage of being convenient for a user, but has a disadvantage in that the recognition rate is remarkably decreased and the security is easy due to easy replication. Fingerprint recognition systems have a high incidence of errors when sweat or moisture gets on the fingerprint scanner. In addition, a person with a lot of labor using a hand, such as a field worker, is often unable to recognize a fingerprint due to a finger wound, a foreign object, or a similarity of a fingerprint. In addition, there is a disadvantage that a person who does not have a fingerprint of a finger cannot use a fingerprint recognition system.

The voice and face recognition system is the most convenient form for the user to use, but when the voice or facial features are similar to each other, due to limitations of the currently developed technology, it is not a highly accurate personal recognition method. In addition, voice can be deceived by recording, face recognition in case of face recognition, plastic surgery, or a photograph or mask to deceive the recognition device, thereby reducing security.

In the case of iris recognition, a user needs to stare at the camera for 3 to 5 seconds in order to recognize the iris. In addition, there is a security vulnerability in that there is no way to prevent this when the iris of another person is used to recognize the device.

The method via the back of the hand or the vein of the finger is also convenient for the user and has the advantage of showing a high recognition rate because of the low possibility of deformation. Personal recognition devices using veins of the back of the hand and fingers are disclosed in US Pat. No. 5,1787,185 and Japanese Laid-Open Patent Publication No. 2002-83298, respectively.

In particular, using the vein of the finger compared to using the vein of the back of the hand has the advantage that the device can be miniaturized. However, the conventional personal recognition device using the back of the hand or the finger vein uses a method of measuring the orthogonal projection of the vein by shining light on one side of the back of the hand or finger. There were many cases where it was difficult to distinguish between people with finger veins of similar orthographic patterns. However, even if the orthogonal projection on one side of the finger is a simple pattern, the orthogonal projection on the other side has a fairly complicated pattern.

It is an object of the present invention to provide a personal recognition device which increases personal recognition rate by photographing a finger vein in various directions, in particular by using a finger vein.

Another object of the present invention is to provide a personal recognition device capable of obtaining a clear finger vein pattern by providing an optical waveguide member between a light source and a finger.

In addition, an object of the present invention is to provide a personal recognition device capable of obtaining a clearer finger vein pattern by having a light source that emits light in a plurality of wavelength regions in the infrared band.

The present invention includes a light source for projecting light with a finger and a camera for photographing light passing through the finger, and a photographing apparatus for photographing a blood vessel pattern of a finger in at least two directions, and comparing the photographed blood vessel pattern with stored blood vessel pattern data. It provides a personal recognition device comprising a computing device to identify the user by. Through such a configuration, since an individual can be identified and authenticated by comparing blood vessel patterns of fingers taken in at least two directions or more, the recognition rate and security of the personal recognition device can be further improved.

In another aspect of the present invention, the photographing apparatus provides a personal recognition device including a camera that rotates around a finger and photographs a blood vessel pattern of a finger in two or more directions. Through such a configuration, the identification and security can be improved through images obtained from various angles of the blood vessels around the finger by rotating the camera or a panoramic image formed therefrom.

In another aspect of the present invention, the photographing apparatus provides a personal recognition device characterized by having two or more cameras facing different directions. Through such a configuration, a blood vessel pattern of a finger photographed in two or more directions can be obtained without increasing the size of the personal recognition device.

In still another aspect of the present invention, the photographing apparatus includes an image of a hemispherical concave mirror capable of enclosing a finger at a center opposite to a light projection direction and an orthogonal blood vessel pattern of a plurality of surfaces of a finger reflected in the concave mirror. It provides a personal recognition device characterized by comprising a camera that can take a picture at a time.

In another aspect of the present invention, the photographing apparatus provides a personal recognition device comprising a camera positioned opposite the light projection direction and an angle of view magnifying lens positioned between the camera and a finger. For example, the angle of view magnifying lens may include one or more convex lenses capable of enlarging the camera's imageable range to the side of the finger, and one or more concave lenses capable of reducing aberrations of the convex lenses.

In another aspect of the present invention, the photographing apparatus includes a camera positioned opposite the light projection direction and a reflecting surface positioned obliquely on both sides of the finger so that the blood vessel pattern on both sides of the finger can be reflected by the camera. It provides a personal recognition device. Through this configuration, a panoramic image of the finger blood vessel pattern can be obtained at a low manufacturing cost.

In another aspect of the present invention, the photographing apparatus provides a personal recognition device comprising any one of a CCD camera and a CMOS camera capable of sensing light in the infrared wavelength region. Blood vessels absorb light in the near-infrared wavelength region in particular compared to other tissues such as bones, muscles, and fat, so that a pattern of blood vessels can be more clearly captured by using a camera having a good sensitivity in the infrared band.

In another aspect of the present invention, there is provided a personal recognition device further comprising a filter positioned between the camera and the finger and passing only light in the near infrared band. Through this configuration, the blood vessel pattern captured by the camera can be made clearer.

In still another aspect of the present invention, there is provided a personal recognition device further comprising an optical waveguide member having a total reflection characteristic and transmitting light projected from the light source to a finger by touching the light source. Through this configuration, the light emitted from the light source can be effectively focused and put into the finger, and the light of the light source leaks out to both sides of the finger to prevent the image captured by the camera from being blurred.

In another aspect of the present invention, there is provided a personal recognition device, characterized in that the light source is at least one illumination that emits light in at least one central wavelength region. For example, the light source may consist of any suitable combination of LEDs having different center wavelengths in the near infrared band of 700 nm to 1000 nm. By using near-infrared light in the wide wavelength region, contrast between blood vessels and other skin tissues can be clearly obtained, thereby obtaining a clearer blood vessel pattern.

In another aspect, the present invention provides a personal recognition device further comprising a guide device positioned between the light source and the photographing device and guiding a finger fixing position.

In addition, as another aspect of the present invention, the calculation unit determines whether or not the blood vessel pattern photographed by the imaging device, and if the blood vessel pattern cannot be identified by adjusting the exposure time of the camera by the command of the calculation unit or the It provides a personal recognition device further comprises a light amount adjusting device that can adjust the overall amount of light or control the brightness of a portion of the light source.

In still another aspect of the present invention, the associating device provides a personal recognition device, characterized in that to reconstruct the blood vessel pattern in three dimensions, and to compare the stored three-dimensional blood vessel pattern.

The personal recognition device provided by the present invention can increase the personal recognition rate by photographing a vein of a finger in various directions.

In addition, the personal recognition device provided by the present invention can obtain a clear finger vein pattern by installing an optical waveguide member between the light source and the finger.

In addition, the personal recognition device provided by the present invention includes a light source that emits light in a plurality of wavelength regions within the infrared band, so that the contrast between blood vessels and surrounding tissues can be clearly obtained to obtain a clearer finger vein pattern, and thus the recognition rate. And security can be improved.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a diagram illustrating a part of a personal recognition device according to a first embodiment of the present invention. The personal recognition device includes a photographing apparatus 100 for photographing a blood vessel pattern of a finger and an arithmetic device (not shown) for identifying and authenticating an individual using the photographed blood vessel pattern. The computing device may be installed integrally with the imaging device 100, or the imaging device 100 may be connected to a device such as a separate server or a PC, and such a device may serve as a computing device.

The photographing apparatus 100 includes a casing 101 forming an appearance, and an insertion hole 102 is formed on a front surface of the casing 101 so that a finger can be inserted into the photographing apparatus 100. In addition, a plurality of members may be installed in the casing 101, a motor (not shown) for rotating the rotating shaft 104, and a frame 103 rotatably connected to the rotating shaft 104 are installed, and the frame 103 is provided at the casing 101. The guide device 110, the camera 140, and the like are installed. In addition, an LED 120, an optical waveguide member 130, and the like, which serve as a light source, are installed in the casing 101, and the LED 120 and the optical waveguide member 130 are fixed to the frame 103 and rotatably installed. It may be fixed, it may be fixed to the casing 101 can be installed so as not to rotate.

A sensor 105 for detecting the insertion of a finger is installed around the insertion hole 102 of the casing 101. The sensor 105 is a sensor that can detect that something is inserted from the outside, such as an infrared sensor and an ultrasonic sensor. The sensor 105 is connected to a control unit (not shown) of the photographing apparatus 100, and when the sensor 105 detects that a finger is inserted, the control unit (not shown) includes an LED 120, a camera 140, and a motor. Apply power to a device that requires a power source, such as (not shown). Through such a configuration, a power saving effect may be obtained by cutting off power to the electronic device when the personal recognition device 100 is not in use.

In the casing 101, a guide device 110 for guiding the insertion position of a finger is installed behind the insertion hole 102. The guide device 110 has a substantially half-pipe shape, and when the finger is inserted through the insertion hole 102, the finger is naturally placed on the top of the guide device. The guide device 110 is composed of a half-pipe-shaped frame so that the light of the LED 120 to shine a finger, there should be no surface blocking between the finger and the LED (120).

The LED 120 is installed below the guide device 110. A plurality of LEDs 120 are installed in rows along the insertion direction of the finger. Preferably, the LED 120 is an infrared LED, and particularly preferably a multi-wavelength LED emitting a wavelength in the near infrared region of 700 nm to 1000 nm. In the personal recognition device using the finger blood vessel pattern, the absorbance of blood in the near infrared wavelength region is higher than that of the surrounding tissue, and when the light in the near infrared wavelength region is illuminated on the finger, the portion of the blood vessel passing by the blood is displayed in dark shades. The blood vessel pattern of the can be confirmed. Therefore, when the LED 120 emits the wavelength of the near infrared region, the blood vessel pattern of the finger can be observed in more detail. In addition, the LED 120 is preferably a plurality of LEDs having different wavelengths within the 700 nm to 1000 nm near infrared wavelength, when the LED 120 emits light in such a wide wavelength range, the contrast between the surrounding tissue tissue and blood vessels becomes clear There is an advantage.

The LED 120 and the finger may not be in close contact with each other, and thus light may leak into the gap between the LED 120 and the finger. In this case, the light is excessive, the photograph is blurred, and a clear blood vessel pattern of the finger cannot be obtained. In addition, since the LED 120 has a plurality of point light sources arranged in a column, the quality of blood vessel pattern photographs may be degraded due to the difference in brightness between where the point light source is located and where it is not. Therefore, the optical waveguide member 130 is installed between the LED 120 and the finger. The optical waveguide member 130 has a total reflection characteristic such that light is not emitted or incident through other than the LED 120 side end and the finger side end. In addition, the optical waveguide member 130 is formed of an elastic material to increase adhesion to the finger, while the optical waveguide member 130 has a width of about 1mm to 3mm to minimize the contact area with the skin to prevent the light from spreading as much as possible Do it. Generally, materials such as PDMS are preferably used. In addition, when the plurality of LEDs 120 in which the LEDs 120 are arranged in columns having different wavelengths are installed as described above, the light guide member 130 is optically waveguided by the light incident from the point light source LEDs 120. The light may be diffused in the member 130 and emitted at a uniform brightness at the finger side end.

The camera 140 is installed on the other side of the lower side where the LED 120 is installed, that is, the upper side. The camera 140 is preferably an infrared camera capable of detecting wavelengths in the near infrared band where red blood cells of the blood mainly absorb light. In front of the camera 140, it is more preferable that a near-infrared filter (not shown) which mainly passes light in the near-infrared band is installed. Through this configuration, a clearer finger blood vessel pattern picture can be obtained.

The camera 140 and the guide apparatus 110 are fixed to the frame 103 rotatably installed, and the frame 103 is connected to the rotation shaft 104. The rotating shaft 104 is connected to a motor (not shown) and serves to transmit the rotating force to the frame 103. The camera 140 rotates to photograph blood vessel patterns of a finger at various angles. Therefore, compared to the conventional personal recognition device for photographing the blood vessel pattern of the finger in one direction, it is possible to increase the discriminating power of the individual, and when the identification power is improved, the security is also improved. The camera 140 may photograph blood vessel patterns of two or more fingers while rotating an appropriate angle, or photograph blood vessel patterns of a finger in a panorama form. The computing device (not shown) may store data of two or more finger vein patterns or panorama finger vein patterns photographed by the photographing apparatus 100 including the camera 140 at different angles. The data can be compared for personal authentication or identification. In addition, the computing device (not shown) may store, personalize, and identify by reconstructing two or more finger blood vessel patterns or panorama finger blood vessel patterns photographed from different angles into three-dimensional images.

On the other hand, the computing device (not shown) in conjunction with the light amount control device 125 for adjusting the light amount of the LED 120, the blood vessel pattern of the finger photographed by the imaging device 100 is impossible to read due to lack of light or excessive amount of light Case, the function of adjusting the amount of light. The light amount adjusting device 125 is configured as a simple circuit that can adjust the light amount of the LED 120 according to a command of a computing device (not shown).

Meanwhile, the light amount adjusting device 125 may adjust the exposure time of the camera 140 through a computing device (not shown) in addition to adjusting the light amount of the LED 120. The light amount adjusting device 125 increases the exposure time of the camera 140 together with adjusting the light amount of the LED 120 when the blood vessel pattern of the photographed finger is insufficient light, and increases the exposure time of the camera 140 when the light amount is excessive. It is controlled to obtain a blood vessel pattern of the finger which is easy to read by reducing.

The light amount adjusting device 125 may perform only one of the function of adjusting the light amount of the LED 120 and the function of adjusting the exposure time of the camera 140, but the blood vessel pattern of the finger is easy for the user and easy to read. It is desirable to be able to perform both functions to obtain.

2 is a diagram illustrating a part of a personal recognition device according to a second embodiment of the present invention. Although the schematic configuration is the same as that of the first embodiment of the present invention, the rotating shaft, the frame, and the guide device are omitted, and instead, the reflective surface 150 is installed obliquely on both sides of the optical waveguide member 130.

The reflective surface 150 is formed behind the insertion hole 102 formed in the casing 101, and is installed obliquely on both sides of the optical waveguide member 130. Since the finger inserted through the insertion hole 102 may be guided by the reflective surfaces 150 installed obliquely at both sides, the guide apparatus 110 (shown in FIG. 1) of the first embodiment may be omitted. Since the reflective surface reflects a part of both side surfaces and the lower surface of the finger toward the camera 140, the finger blood vessel pattern viewed from various directions can be photographed as in the first embodiment without rotating the camera 140.

3 is a diagram schematically illustrating a principle of photographing a finger blood vessel pattern using a second embodiment. In the case where the cylindrical member is inserted and photographed with a camera, only the front surface can be photographed unless the reflective surface 150 (shown in FIG. 2) is provided (picture on the left in the figure). However, if the reflective surface 150 (shown in Fig. 2) is installed on both sides and photographed with the camera 140, both front and both sides can be photographed (right side of the figure). In this case, when the reflective surface 150 (shown in FIG. 2) is installed and photographed, portions of the front and side surfaces may be overlapped and photographed. Therefore, in such a case, the computing device (not shown) may find overlapping portions, and then reconstruct both side photographed images and front photographed photographs into a single panoramic photograph to store data, personally identify and authenticate the photograph.

4 is a diagram illustrating a part of a personal recognition device according to a third embodiment of the present invention. Although the schematic configuration is the same as in the first embodiment of the present invention, the rotating shaft, the frame, the guide device are omitted, and the concave mirror 152 is provided on the opposite side of the LED 120 and the light amount control device 125. On the other hand, the camera 140 is formed at a position where the light generated from the LED 120 can measure the image reflected through the finger through the concave mirror 152. In the third embodiment of the present invention, the concave mirror 152 is formed in a substantially concave semicircle shape, the portion corresponding to the string (diameter) is located at the end of the finger, and the distance from the finger is the farthest. The camera 140 is obliquely positioned at a portion corresponding to the string of the concave mirror 152, that is, the reflection surface is wider, and photographs a blood vessel pattern of a finger reflected by the concave mirror 152. At this time, since the finger inserted through the insertion hole 102 may be guided by the concave mirror 152, the guide device 110 (shown in FIG. 1) may be omitted. The concave mirror 152 reflects the blood vessel pattern of the finger up to approximately 180 ° to allow imaging. Therefore, even if the camera 140 does not rotate, the same effect as photographing a blood vessel pattern of a finger from various angles can be obtained.

5 is a diagram illustrating a part of a personal recognition device according to a fourth embodiment of the present invention. Although the schematic configuration is the same as in the first embodiment of the present invention, a rotation axis, a frame, and a guide device are omitted, and a plurality of lenses are provided between the camera 140 and the optical waveguide member 130 to allow panoramic photography to the side of the finger. An array of lens arrays 151 is provided. The lens array 151 includes a plurality of convex lenses and a concave lens to serve as a wide-angle lens that can shoot up to the side of the finger. The convex lens is installed around the finger so that the side of the finger can be photographed, and the concave lens functions to correct the aberration of the convex lens, so that an accurate image of the finger blood vessel pattern can be formed on the camera 140.

6 is a diagram illustrating a part of a personal recognition device according to a fifth embodiment of the present invention. Although the schematic configuration is the same as in the first embodiment of the present invention, the rotating shaft and the frame are omitted, and instead, a plurality of cameras 140 are provided at different angles. In the drawing, three cameras 140 should be provided on the front and both sides, but only two or more cameras 140 need to be provided if the finger blood vessel pattern can be photographed at different angles.

If the plurality of cameras 140 are arranged to photograph from different angles, the finger blood vessel patterns viewed from different angles may be photographed. Therefore, even if different individuals have finger vein patterns that look almost the same in one direction, they can be identified and authenticated by supplementing with finger vein patterns taken from different angles. In this case, similarly to the first embodiment, the computing device (not shown) may reconstruct and compare the finger blood vessel patterns in three dimensions based on finger blood vessel patterns taken from different angles.

7 is a schematic diagram illustrating a principle of photographing finger blood vessel patterns of a personal recognition device according to the present invention. First, when the sensor 105 detects the insertion of a finger and sends a signal to the control unit 106, the control unit 106 supplies power to an electronic device such as the LED 120, the light amount control unit 125, and the camera 140. Is authorized. By the adjustment of the light amount adjusting device 125, the LED 120 emits infrared rays in the amount of light of the reference amount. The infrared rays emitted from the LED 120 are guided to the finger by the optical waveguide member 130, and a large part of the infrared rays passing through the blood vessel of the infrared rays passing through the finger are absorbed by the red blood cells. The infrared rays passing through the finger are photographed by the infrared camera 140 via the infrared filter 145, and the photographed data is transmitted to the computing device 200. The infrared camera 140 includes a sensor capable of converting an image into electronic information, such as a CCD sensor or a CMOS sensor, and transmits the converted electronic information to the computing device 200. The computing device 200 reconstructs this information and compares it with existing data to identify and authenticate an individual. In addition, when the amount of light is too large or insufficient, the CCD sensor or CMOS sensor of the infrared camera 140 does not provide accurate information, the computing device 200 sends a signal to the light amount adjusting device 125 to adjust the light amount, the light amount Can be adjusted appropriately.

1 is a diagram illustrating a part of a personal recognition device according to a first embodiment of the present invention.

2 is a diagram illustrating a part of a personal recognition device according to a second embodiment of the present invention.

3 is an example of an image captured by a personal recognition device according to a second embodiment of the present invention.

4 is a diagram illustrating a part of a personal recognition device according to a third embodiment of the present invention.

5 is a diagram illustrating a part of a personal recognition device according to a fourth embodiment of the present invention.

6 is a diagram illustrating a part of a personal recognition device according to a fifth embodiment of the present invention.

Figure 7 is a schematic diagram showing the principle of photographing finger blood vessel pattern of the personal recognition device according to the present invention.

Claims (13)

A photographing apparatus having a light source for projecting light with a finger and a camera for photographing light passing through the finger, for photographing a blood vessel pattern of a finger in at least two directions; And And a computing device which reconstructs the photographed blood vessel pattern in three dimensions and compares the stored three-dimensional blood vessel pattern data to identify a user. The method of claim 1, The photographing apparatus includes a camera that rotates around the finger and photographs a blood vessel pattern of the finger in two or more directions. The method of claim 1, The photographing apparatus comprises two or more cameras facing different directions. The method of claim 1, The photographing apparatus includes a hemispherical concave mirror in which a center is located opposite the light projection direction and can enclose a finger, and a camera capable of capturing images of orthogonal blood vessel patterns of a plurality of surfaces of a finger reflected in the concave mirror at a time. Personal recognition device, characterized in that. The method of claim 1, The photographing apparatus includes a camera positioned opposite the light projection direction and an angle of view magnifying lens positioned between the camera and the finger. The method of claim 1, The photographing apparatus includes a camera located opposite to the light projection direction and a reflection surface positioned obliquely on both sides of the finger so that the blood vessel pattern on both sides of the finger can be reflected by the camera. The method of claim 1, The photographing apparatus includes any one of a CCD camera and a CMOS camera capable of sensing light in an infrared wavelength region. The method of claim 7, wherein And a filter positioned between the camera and the finger and allowing only light in the near infrared band to pass therethrough. The method of claim 1, And an optical waveguide member having a total reflection characteristic and transmitting the light projected from the light source to the finger by touching the light source. The method of claim 1, The light source is one or more lights that emit light of one or more central wavelengths. The method of claim 1, And a guide device positioned between the light source and the photographing device and guiding a finger fixing position. The method of claim 1, The calculating unit determines whether or not the blood vessel pattern photographed by the imaging device can be identified, And a light amount adjusting device configured to adjust at least one of the light amount of the light source and the exposure time of the camera by a command of the calculation unit when the blood vessel pattern cannot be identified. delete

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