WO2008004314A1 - Système d'authentification personnelle - Google Patents

Système d'authentification personnelle Download PDF

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Publication number
WO2008004314A1
WO2008004314A1 PCT/JP2006/313921 JP2006313921W WO2008004314A1 WO 2008004314 A1 WO2008004314 A1 WO 2008004314A1 JP 2006313921 W JP2006313921 W JP 2006313921W WO 2008004314 A1 WO2008004314 A1 WO 2008004314A1
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WO
WIPO (PCT)
Prior art keywords
gain
liquid crystal
personal authentication
pixel block
authentication device
Prior art date
Application number
PCT/JP2006/313921
Other languages
English (en)
Japanese (ja)
Inventor
Hironori Ueki
Takafumi Miyatake
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/JP2006/313921 priority Critical patent/WO2008004314A1/fr
Priority to JP2008523590A priority patent/JP4649514B2/ja
Publication of WO2008004314A1 publication Critical patent/WO2008004314A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/28—Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/14—Vascular patterns
    • G06V40/145—Sensors therefor

Definitions

  • the present invention relates to a personal authentication device for identifying an individual, and more particularly to a technique for identifying an individual based on biometric information.
  • biometric authentication that identifies individuals using the characteristics of biometric information has attracted attention.
  • the biometric information is a fingerprint, an iris, or a blood vessel pattern.
  • Biometrics has the advantage of high convenience and security. This is because biometric authentication does not require a key to be carried. Therefore, biometrics and proofs are less likely to be fraudulent due to loss or theft.
  • blood vessel authentication is becoming widespread.
  • the blood vessel pattern is information inside the living body, so it is difficult to forge compared to fingerprints. Therefore, blood vessel authentication is more secure than fingerprint authentication.
  • blood vessel authentication it is not necessary to irradiate the eyeball with light unlike iris authentication. For this reason, blood vessel authentication has low user psychological resistance and high safety.
  • the blood vessel authentication device irradiates the human body with near infrared light. Then, the blood vessel authentication device captures transmitted light or reflected light using an image sensor. At this time, hemoglobin in the blood absorbs a lot of near infrared rays. Therefore, blood vessel patterns are drawn on the captured image. In the blood vessel recognition, it is determined whether or not the blood vessel pattern drawn on the photographed image matches the blood vessel pattern registered in advance. The blood vessel authentication device identifies an individual based on the blood vessel pattern determination result.
  • the blood vessel authentication device is disclosed in Japanese Patent Application Laid-Open No. 7-2 1 3 73 and Japanese Patent Application Laid-Open No. 2000-0 9 2 6 16. It is disclosed in Japanese Patent Laid-Open No. 2 0 0 2-9 2 6 1 6
  • the blood vessel authentication device adjusts the amount of light so that the amount of light incident on the image sensor is appropriate.
  • Japanese Patent Application Laid-Open No. 2003-135437 and Japanese Patent Application Laid-Open No. 8-211518 disclose a method for adjusting the amount of incident light for an image sensor for an X-ray diagnostic apparatus.
  • a pre is performed prior to the actual photographing. Then, based on the pre-photographed image, the exposure amount and the detector gain during the main photographing are determined. Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 8-211518, a liquid crystal display screen is arranged on the front surface of the image sensor. The amount of light incident on the image sensor is adjusted by changing the liquid crystal display density of the liquid crystal display screen.
  • Japanese Patent Laid-Open No. 2006-5762 discloses a liquid crystal shirt that controls the amount of light incident on an image sensor.
  • Japanese Patent Laid-Open No. 2002-62106 discloses a technique for correcting variations in sensitivity of an image sensor. Angiography is expected to be applied in various fields. For example, blood vessel authentication can be applied to entrance management, bank ATM devices, automobiles, computers, mopile devices, and the like. Disclosure of the invention
  • the brightness of the surroundings changes greatly.
  • the ambient light intensity differs greatly between daytime and nighttime.
  • the intensity of ambient light differs greatly between indoors and outdoors.
  • Such a change in ambient light intensity causes a reduction in recognition accuracy by the blood vessel authentication device.
  • ambient light is likely to be mixed near the contour of the finger.
  • the detection signal of the image sensor is saturated near the contour of the finger. The saturation of the detection signal is Since the region where the blood vessel pattern in the captured image can be measured is reduced, it causes a decrease in authentication accuracy.
  • the gain of the image sensor needs to be set low.
  • the SZN of the photographed image deteriorates in the low signal area where the signal intensity is low, such as the area near the center of the finger. As a result, the accuracy of authentication decreases.
  • the image sensor since the variation in the amount of incident light in one captured image is large, the image sensor is required to have a wide dynamic range.
  • measures such as increasing the number of quantization bits in the AD converter or reducing noise in the signal readout circuit are taken.
  • measures such as increasing the number of quantization bits in the AD converter or reducing noise in the signal readout circuit are taken.
  • measures not only increase costs, but also increase shooting time and circuit power consumption. Therefore, it becomes a big problem in mopile equipment that requires high speed and low power consumption.
  • the blood vessel recognition device 11 can adjust the amount of near infrared light emitted from the light source.
  • the blood vessel authentication device uses the pre-captured image and the exposure amount and the detector gain during the main imaging Can be adjusted.
  • the blood vessel authentication device can adjust the amount of light incident on the image sensor by controlling the liquid crystal concentration.
  • the blood vessel authentication device can adjust the amount of light incident on the image sensor by controlling the exposure time using a liquid crystal shutter.
  • the gain or incident light amount of the image sensor is controlled in common for all pixels. Therefore, the dynamic range within one captured image is not expanded. For this reason, any of the above-mentioned known techniques are used.
  • blood vessel recognition cannot solve the problem of signal saturation around the finger and the lack of signal at the center of the finger at the same time.
  • Japanese Patent Laid-Open No. 2 0 2-6 2 1 0 6 discloses a method for correcting gain variation between pixels, but discloses a method for adjusting the gain to expand the dynamic range. It has not been . In other words, the blood vessel authentication device needs to optimize the gain according to changes in the subject or the ambient light intensity.
  • Japanese Patent Laid-Open No. 2 0 2-6 2 2 10 6 does not disclose such a gain optimization method.
  • a typical embodiment of the present invention has been made in view of the above-described problems, and an object thereof is to provide a personal authentication ⁇ having high authentication accuracy.
  • a representative form of the present invention includes an imaging unit that captures an image of a subject, and in the personal identification device 11 for identifying an individual corresponding to the subject based on a biological pattern of the subject included in the captured image,
  • the imaging unit includes an imaging surface composed of a plurality of pixel blocks
  • the personal identification 11 is a signal processing unit that removes a high frequency component from the captured image, and an imaging in which the high frequency component is removed
  • a gain adjusting unit that sets a pixel gain for each pixel block so that a pixel value of an image approaches a predetermined value.
  • the authentication accuracy of the personal authentication device can be improved.
  • FIG. 1 is a configuration diagram of the personal authentication device according to the first embodiment of the present invention.
  • FIG. 2 is a perspective view of an image sensor provided in the personal authentication device according to the first embodiment of the present invention.
  • FIG. 3 is a configuration diagram of an image sensor substrate provided in the personal authentication device according to the first embodiment of the present invention.
  • FIG. 4 is an explanatory diagram of a signal readout circuit provided in the image sensor substrate according to the first embodiment of the present invention.
  • FIG. 5 is an explanatory diagram of processing timing of the personal authentication device according to the first embodiment of this invention.
  • FIG. 6 is a flowchart of the photographing process of the personal authentication device according to the first embodiment of the present invention.
  • FIG. 7 is an explanatory diagram of an image photographed by the personal authentication device according to the first embodiment of this invention.
  • FIG. 8 is a graph relating to pixel value profiles of images taken with the same gain set for all detection pixels.
  • FIG. 9 is an explanatory diagram of changes in the profile of an image taken by the personal authentication device according to the first embodiment of this invention.
  • FIG. 10 is an explanatory diagram of a detection pixel block according to the first embodiment of this invention.
  • FIG. 11 is an explanatory diagram of the processing timing of the personal authentication IE apparatus when the detection pixel block according to the first embodiment of the present invention has four detection pixel forces.
  • FIG. 12 is an explanatory diagram of the detection pixel block according to the first embodiment of the present invention.
  • FIG. 13 shows the timing of the personal identification process when the detection pixel block according to the first embodiment of the present invention is composed of all detection pixels having the same position in the X-axis direction. It is explanatory drawing of.
  • FIG. 14 is a block diagram of the personal authentication device according to the second embodiment of the present invention.
  • FIG. 15 is an explanatory diagram of the positional relationship between the detection pixels of the image sensor substrate and the display pixels of the liquid crystal display substrate 9 according to the second embodiment of the present invention.
  • FIG. 16 is an explanatory diagram of processing timing of the personal authentication device according to the second embodiment of this invention.
  • FIG. 17 is a flowchart of the photographing process of the personal authentication device according to the second embodiment of the present invention.
  • FIG. 18 is an explanatory diagram of a mobile phone to which the personal authentication device according to the second embodiment of the present invention is applied.
  • FIG. 19 is an explanatory diagram of a display screen of a mobile phone to which the personal authentication device according to the second embodiment of the present invention is applied.
  • FIG. 1 is a configuration diagram of the personal authentication device according to the first embodiment of the present invention.
  • the personal authentication device performs authentication based on the blood vessel pattern of the subject 1.
  • the subject 1 is a human finger, but may be other than a human finger as long as it can capture a blood vessel pattern.
  • the subject 1 is the palm or the back of the hand.
  • the personal recognition SE3 ⁇ 4 unit consists of an image sensor, an imaging control unit CTL1, and a gain adjustment unit CTL.
  • Frame memory MEM 1 Gain recording memory MEM 2
  • Signal processing section DSP and verification result reporting section REP.
  • Image sensor has light source 2, shading frame
  • micro lens 4 visible light blocking filter 5
  • image sensor substrate 6 support substrate 7, electrodes 8A and 8B.
  • the light source 2, the light shielding frame 3 and the image sensor substrate 6 are fixed to the upper surface of the support substrate 7.
  • a visible light blocking filter 5 and a microlens 4 are disposed on the upper surface of the image sensor substrate 6.
  • Electrodes 8A and 8B are disposed on the upper surface of the light shielding frame 3.
  • Light source 2 irradiates subject 1 with infrared light.
  • the light source 2 is an LED (Light Emiting Diode).
  • Shading frame 3 is light Support source 2. Further, the light shielding frame 3 prevents the infrared light emitted from the light source 2 from directly entering the image sensor substrate 6.
  • the microlens 4 forms an image of the subject 1 by infrared rays on the image sensor substrate 6.
  • the microlens 4 is a well-known one used in a CCD (Challege Couple DeVice) camera or a CMOS (Complementary Meter—Oxide Sem iCandu ctor) sensor or the like.
  • the visible light blocking filter 5 reduces ambient light incident on the image sensor substrate 6. This improves the contrast of the blood vessel pattern.
  • a known filter is used for the visible light blocking filter 5.
  • the known visible light blocking filter 5 can reduce visible light, but cannot completely block it. Further, the known visible light blocking filter 5 cannot block infrared light contained in ambient light. Therefore, the known visible light blocking filter 5 cannot completely prevent a decrease in contrast of the blood vessel pattern due to ambient light.
  • the image sensor substrate 6 detects an infrared blood vessel pattern. Then, the image sensor substrate 6 converts the detected blood vessel pattern into a digital signal.
  • the image sensor substrate 6 is a TFT (ThinFilmTransiStor) sensor.
  • TFT ThinFilmTransiStor
  • a plurality of detection pixels are arranged in an array.
  • the detection pixel includes a photodiode and a TFT switch. Details of the image sensor substrate 6 will be described with reference to FIG. Further, the image sensor substrate 6 may be used in a known CCD camera or CMOS sensor instead of the TFT sensor.
  • Electrodes 8 A and 8 B sense subject 1. A slight potential difference of about several mV is provided between the electrode 8A and the electrode 8B. Then, the electrodes 8 A and 8 B determine the presence / absence of the subject 1 based on the presence / absence of the current flowing through the subject 1.
  • Shooting control unit CTL 1 is an infrared sensor and image sensor board. Controls the shooting of images by 6.
  • the gain adjusting unit CTL 2 controls the gain of the image sensor substrate 6 by referring to the gain recording memory MEM 2 by a method described later with reference to FIG.
  • the frame memory MEM 1 records an image taken by the image sensor substrate 6.
  • the signal processing unit D S P refers to the captured image recorded in the frame memory MEM 1 and calculates the gain set in the image sensor substrate 6. Further, the signal processing unit DPS performs a personal authentication calculation of the subject 1 with reference to the captured image recorded in the frame memory MEM1. For the personal authentication calculation, a known technique disclosed in Japanese Patent Laid-Open No. 2002-92616 is used.
  • the signal processor DPS is realized by a dedicated processor or general-purpose processor executing a program.
  • the gain recording memory M E M 2 records the gain set in the image sensor board 6.
  • the authentication result report unit R E P outputs the result of the personal authentication calculation calculated by the signal processing unit D S P.
  • the authentication result report unit REP is a display or a voice generator, and outputs the authentication result in text or voice.
  • the imaging control unit CTL1 turns on the light source 2.
  • the light source 2 starts irradiating the subject 1 with infrared light.
  • the imaging control unit CTL1 gives a control signal to the image sensor substrate 6.
  • the image sensor board 6 starts photographing.
  • the gain adjusting unit CTL2 sets the preset initial gain value Go to the image sensor board 6.
  • the gain setting method by the gain adjustment unit CTL 2 will be described later.
  • the image sensor substrate 6 captures an image.
  • the image sensor substrate 6 records the first captured image in the frame memory MEM 1.
  • the signal processing unit DSP calculates the gain G set at the time of the second shooting based on the first shot image.
  • the signal processing unit DSP records the calculated gain G in the gain recording memory MEM2.
  • the personal identification ⁇ position ends the first shooting.
  • the personal authentication device will continue to take the second shot.
  • the gain adjustment unit C T L 2 sets the gain G recorded in the gain recording memory MEM 2 to the image sensor substrate 6.
  • the image sensor substrate 6 captures an image.
  • the image sensor board 6 records the second shot image in the frame memory MEM 1.
  • the signal processing unit D S P calculates the gain G set in the third shooting based on the second image.
  • the signal processing unit D S P records the calculated gain G in the gain recording memory MEM 2.
  • the personal authentication device ends the second shooting.
  • the personal authentication device is N. Shoot times.
  • the signal processing unit DSP performs personal authentication calculation based on the N 0th shooting image recorded in the frame memory MEM 1.
  • the authentication result report unit REP outputs the result of the personal authentication calculation by the signal processing unit DSP.
  • the standard value of the time required for one shooting with the personal authentication device is approximately 1 Z 60 seconds. Also, the total number of shots N performed by the personal authentication device. The standard value is 4 times.
  • FIG. 2 is a perspective view of an image sensor provided in the personal authentication device according to the first embodiment of the present invention.
  • the short axis direction of the input surface of the image sensor is the X axis. That is, the width direction of the subject 1 is the X axis.
  • the major axis direction of the input surface of the image sensor is the Y axis. In other words, the longitudinal direction of subject 1 is the Y axis. Image center
  • the direction perpendicular to the input surface is the Z axis.
  • the standard size of the input surface of the image sensor is 25.6 mm (X-axis direction) X 51.2 mm (Y-axis direction).
  • the surface position of the microlens 4 is about 1 to 2 mm lower in the Z-axis direction than the top surface position of the shading frame 3. This prevents contact between the subject 1 and the microlens 4 as much as possible. Therefore, the personal authentication device according to the present embodiment can prevent a decrease in contrast of the blood vessel pattern due to the compression of the subject 1.
  • FIG. 3 is a configuration diagram of the image sensor substrate 6 provided in the personal authentication device according to the first embodiment of the present invention.
  • the image sensor substrate 6 includes a photodiode 32, a TFT (ThinFiRaN sisistor) switch 33, a gate line 36, and a data line 37 on a glass substrate.
  • the photodiode 32 generates photoelectrons according to the amount of incident light.
  • T FT switch 33 switches current on and off at high speed.
  • the element unit constituted by the photodiode 32 and the TFT switch 33 is used as a detection pixel.
  • the detection pixels are arranged in an array on the image sensor substrate 6.
  • the standard value of the number of detection pixels provided on the image sensor substrate 6 is 256 (X-axis direction) X 512 (Y-axis direction). In FIG. 3, only four (X-axis direction) X8 (Y-axis direction) detection pixels are shown.
  • the standard pitch of the detection pixel pitch in the X-axis direction and the Y-axis direction is 0.1 mm.
  • Gate line 36 is used to supply flff to the gate of TFT switch 33.
  • the data line 37 is used to read out a charge signal from the detection pixel.
  • the image sensor substrate 6 further includes a shift register 30 and a signal readout circuit 31.
  • the shift register 30 and the signal readout circuit 31 are arranged on individual silicon chips. Each silicon chip is fixed on the image sensor substrate 6.
  • the shift register 30 and the gate line 36 are connected by wire bonding 35.
  • the data line 37 and the signal readout circuit 31 are connected by wire bonding .34. Since the wire bondings 34 and 35 are well-known techniques, description thereof is omitted.
  • the photodiode 32 When light enters the photodiode 32, photoelectrons are generated. When the TFT switch 33 is off, the generated photoelectrons are accumulated at the junction (shown) of the photodiode 32. The capacitance (junction capacitance) accumulated at the junction of the photodiode 32 is, for example, 0.5 pF. When the TFT switch 33 is turned on, the accumulated photoelectrons are transmitted to the signal readout circuit 31 via the data line 37. Then, the signal readout circuit 31 reads out the charge signal by a method described later.
  • the shift register 30 supplies a voltage to the gate of the TFT switch 33 via the gate line 36. Thereby, the shift register 30 switches the TFT switch 33 on or off. Note that the gate lines 36 to which the voltage is supplied by the shift register 30 move sequentially in the Y-axis direction. At this time, the signal readout circuit 31 reads out the charge signal from the detection pixel including the TFT switch 33 to which « ⁇ is supplied.
  • FIG. 4 is an explanatory diagram of the signal reading circuit 31 provided in the image sensor substrate 6 according to the first embodiment of the present invention.
  • FIG. 4 shows a circuit configuration included in the region 38 of FIG.
  • the signal reading circuit 31 includes a charge amplifier 40, a CDS (Correlated Doub 1 e Sampling) circuit 41, a sample hold circuit 42, a multiplexer 43, a gain setting shift register 44, a gain setting holding memory 45, AD It includes a converter 46, feedback capacitors C1 to C3, a reset switch M0, and gain selection switches M1 to M3.
  • CDS Correlated Doub 1 e Sampling
  • the feedback capacitance C 1 is 0.2 p F
  • the feedback capacitance C 2 is 0.4 p F
  • the feedback capacitance C3 is 0.8pF.
  • seven types of gain can be specified.
  • the gain is controlled by a 3-bit input via the gain selection lines L1 to L3.
  • the total value of the feedback capacitance is 0.2 pF.
  • the total value of the feedback capacitance is 8 types of 0.2 pF, 0.4 pF, 0.6 pF, 0.8 p F, 1. O pF, 1.2 pF or 1.4 pF. Either.
  • the gain of the charge amplifier 40 is proportional to the reciprocal of the total value of the feedback capacitance. Therefore, in the present embodiment, the gain when the total value of the feedback capacitance is 1.4 pF is set to “1”. The gain when the total feedback capacitance is 0.2 pF is “7”. In this way, the gain is specified between “1” and “7”.
  • the signal readout row includes all detection pixels whose positions in the Y-axis direction are the same.
  • the gain adjustment unit CTL2 sequentially selects the detection pixels included in the signal readout row in the X-axis direction.
  • the gain adjustment unit CTL2 reads the gain set for the selected detection pixel with reference to the gain recording memory MEM2.
  • the gain adjusting unit CTL2 outputs the read gain to the gain selection lines L1 to L3.
  • the gain adjusting unit CTL2 performs this operation for every detection pixel included in the signal readout row.
  • the gain setting shift register 44 sequentially switches the designated position of the gain in the X-axis direction. That is, the gain setting shift register 44 sequentially selects the gain setting holding memory 45 in the X-axis direction. Then, the gain setting shift register 44 switches on the selected gain setting holding memory 45. Only when the input from the gain setting shift register 44 is turned on, the gain setting holding memory 45 accepts the gain selection lines L1 to L3 and their inputs 3 ⁇ 4] £. The gain setting holding memory 45 outputs the received input voltage as the gate voltage of the gain arresting switches M1 to M3. The gain setting holding memory 45 holds the output voltage to the gain selection switches M1 to M3 until the next input from the gain setting shift register 44 is received.
  • the gains of all detection pixels included in the signal readout row are set.
  • the imaging control unit C T L 1 resets the voltage across the feedback capacitor of the charge amplifier 40 via the reset line L 0.
  • the shift register 30 turns on all the TFT switches 33 included in the signal read row. As a result, the signal charge of each detection pixel is input to the charge amplifier 40 via the data line 37.
  • the charge amplifier 40 charges the input signal charge to a preset feedback capacitor. At this time, if the signal charge to be charged is Q [C], the output 3 ⁇ 4] £ of the charge amplifier changes by QZC [V]. Note that C is a preset Naosuke Tanio. .
  • the C DS circuit 41 outputs the change amount of the output voltage of the charge amplifier 40 to the sample monored circuit 42.
  • the C DS circuit 41 has a function of removing reset noise of the feedback capacitor and l Z f noise of the charge amplifier 40.
  • the sample hold circuit 42 extracts the output voltage of the CDS circuit 41 at a preset timing.
  • the sample hold circuit 42 inputs the extracted value to the multiplexer 43 while holding the extracted voltage.
  • the multiplexer 4 3 selects the sampler hold circuit 4 2 in order in the X-axis direction.
  • the multiplexer 43 outputs the 3 ⁇ 4i input from the selected sample and hold circuit 42 to the AD converter 46.
  • AD change ⁇ 4 6 is input from multiplexer 4 3
  • the voltage is converted into a digital signal.
  • the AD converter 46 records the converted digital signal in the frame memory MEM 1.
  • the number of quantization bits of AD variant 46 is, for example, 8 bits.
  • FIG. 5 is an explanatory diagram of processing timing of the personal authentication device according to the first embodiment of this invention.
  • S 0 to S 5 1 1 indicate the timing at which the gain is set for each of the signal readout rows.
  • S 5 1 1 indicates the timing at which the gain is set for the detection pixels included in the 5 1 1st signal readout row.
  • Y 0 to Y 5 111 indicate the timing at which signals are read from each of the signal read rows.
  • ⁇ 5 11 indicates the timing at which a signal is read from the detection pixel included in the signal reading row of the 5 1st row.
  • C O to C 5 11 indicate timings for calculating gains set in the next frame period F (N + 1) for each signal readout row.
  • C 5 11 indicates the timing at which the gain set in the next frame period F (N + 1) is calculated for the detection pixel included in the 5 1 1st signal readout row.
  • the frame period F (N) is a period during which the Nth shooting is performed.
  • T s is the start time of the frame period F (N).
  • Te is the end time of the frame period F (N).
  • the personal authentication device cannot perform gain setting processing and signal readout processing at the same time. Therefore, the personal authentication device performs the gain setting process and the signal reading process alternately. In this case, there is a problem that the frame period F (N) becomes long. However, the personal authentication device can set gains individually for all the detection pixels included in the image sensor substrate 6.
  • the gain calculation process is executed by the signal processor DSP. Therefore, The thin calculation process may be performed simultaneously with the gain IS constant process for different signal readout lines or the signal readout process for different signal readout lines.
  • FIG. 6 is a flowchart of a photographing process of the personal authentication device according to the first embodiment of the present invention.
  • the personal authentication device sets a photographing number N indicating the current number of photographing to “1” (60).
  • the personal confirmation iE 3 records the initial gain value Go in the gain recording memory MEM 2.
  • the personal authentication device sets the initial gain value Go to the gain G (X, Y) of all the detection pixels (6 1).
  • the initial gain value G. Is “4” which is an intermediate value between “1” and “7”.
  • the personal authentication device photographs subject 1. Thereby, the personal authentication device acquires the pixel value P (X, Y) of the photographed image (62). Next, the personal authentication device has a shooting number N and a total number N of shots. Are the same (6 3).
  • the number of Tota Nore shootings N 0 is the number of shootings performed in one personal authentication process, and is set in advance.
  • the personal authentication device ends the shooting process (69). On the other hand, shooting number N and total number of shots N. Otherwise, the personal authentication device performs an L PF, (L ow Pa s s Fi 1 ter) operation on the image taken in step 62 (64). Accordingly, the personal authentication device acquires the pixel value P, (X, Y) of the back trend image. Details of the L PF calculation will be described later.
  • the personal authentication device selects all the detection pixels one by one in order.
  • the personal authentication device determines whether or not the pixel value ⁇ ( ⁇ , ⁇ ) of the selected detection pixel is saturated (65).
  • the personal authentication device sets the minimum gain value G b to the gain G ( ⁇ , ⁇ ) of the selected detection pixel (68).
  • the minimum gain value G b is “1”.
  • the personal authentication device detects a detection image whose pixel value is unknown due to halation.
  • the gain can be set even for the element.
  • the personal authentication device can set an appropriate gain at the next photographing for the detection pixel in which the halation is eliminated by setting the minimum gain value Gb.
  • the personal authentication device can set an appropriate gain at high speed even for a detection pixel in which halation has occurred.
  • the personal authentication device can improve the authentication speed.
  • the personal recognition SE3 ⁇ 4 device will set the target value ⁇ ⁇ ⁇ pixel value of the back trend image to the gain G ( ⁇ , ⁇ ) of the selected detection pixel. Multiply ⁇ '( ⁇ , ⁇ ) (6 6).
  • the personal authentication device executes steps 65 to 68 for all the detection pixels.
  • the personal authentication device adds “1” to the shooting number ⁇ when the gain for the next shooting is set for all detection pixels (6 7).
  • FIG. 7 is an explanatory diagram of an image photographed by the personal authentication device according to the first embodiment of this invention.
  • the captured image of this explanatory diagram includes a back trend image 70, a blood vessel image ⁇ 1, and an external region 7 2.
  • the knock trend image 70 is a portion where the finger which is the subject 1 is photographed.
  • the back trend image 70 is obtained by detecting infrared light that has been scattered multiple times inside the finger.
  • the blood vessel image 71 is shown inside the back trend image 70.
  • the scattered infrared light scattered inside the finger is absorbed by the blood vessel, and the blood vessel pattern is depicted.
  • the external area 7 2 is a portion where the finger that is the subject 1 is not photographed. Therefore, external ambient light is incident on the external region 72.
  • FIG. 8 is a graph relating to pixel value profiles of images taken with the same gain set for all detection pixels.
  • the graph in this explanatory diagram relates to a profile of pixel values of an image taken with the same gain set for all detection pixels. That is, the graph in this explanatory diagram relates to a profile of pixel values of an image shot by a shooting method other than the present embodiment.
  • the vertical axis of the graph in this explanatory diagram is the pixel value P of the captured image.
  • the horizontal axis of the graph in this explanatory diagram is the position X in the finger width direction (X-axis direction).
  • the graph in Fig. 8 (A) shows the profile of the pixel values of the captured image when the shooting environment is good.
  • area W 1 can be used for personal authentication.
  • region 1 the back trend component 80 and the blood vessel components 8 1 A to D are detected relatively well without causing halation.
  • the graph in Fig. 8 (B) shows the pixel value profile of the photographed image when the external ambient light is strong.
  • area W2 can be used for personal authentication.
  • the pixel value P. of the captured image will increase overall. Then, halation occurs near the finger contour, and the pixel value P becomes the maximum value Pt. Therefore, the area W 2 that can be used for personal authentication becomes narrower than the area W 1. Then, the personal authentication device cannot detect the blood vessel components 8 1 A and 8 1 E. As a result, the authentication accuracy of personal authentication is reduced.
  • FIG. 8 (C) shows the profile of the pixel values of the captured image when the gains of all detected pixels are set uniformly low. Assume that a low gain is set for all detection pixels to prevent halation. Then, as in the profile shown in FIG. 8 (C), the contrast ⁇ of the blood vessel components 81A to E decreases. Then, the personal authentication device cannot accurately detect all of the blood vessel components 8 1 A to E. Therefore, the authentication accuracy of the personal authentication device is lowered.
  • FIG. 9 is an explanatory diagram of changes in the profile of an image taken by the personal authentication device according to the first embodiment of this invention.
  • the graph in Fig. 9 (A1) shows the gain profile set for each detection pixel during the first imaging.
  • the graph in Fig. 9 (A2) shows the gain profile set for each detection pixel during the second shot.
  • the graph in Fig. 9 (A3) shows the gain profile set for each detection pixel during the third imaging.
  • the graph in Fig. 9 (A4) shows the gain profile set for each detection pixel at the time of the fourth shot.
  • the vertical axis of the graphs in FIGS. 9 (A1) to 9 (A4) is the gain G set for the detection pixel.
  • the horizontal axis of the graph in this explanatory diagram is the position X in the finger width direction (X-axis direction).
  • the graph in Fig. 9 (B 1) shows the pixel value profile of the first image taken.
  • the graph in Fig. 9 (B2) shows the profile of the pixel values of the second image taken.
  • the graph in Figure 9 (B3) shows the pixel value profile of the third image taken.
  • the graph in Fig. 9 (B4) shows the pixel value profile of the fourth image taken.
  • the vertical axis of the graphs in FIGS. 9 (B 1) to 9 (B4) is the pixel value P of the captured image.
  • the horizontal axis of the graphs in FIGS. 9 (B 1) to 9 (B4) is the position X in the finger width direction (X-axis direction).
  • the graph in Fig. 9 (C1) shows the profile of the pixel values of the back-trend image acquired during the first shooting.
  • the graph in Fig. 9 (C2) shows the pixel value profile of the back trend image obtained during the second shooting.
  • the graph in Fig. 9 (C3) shows the pixel value profile of the back trend image acquired during the third shooting.
  • the graph in Fig. 9 (C4) shows the profile of the pixel values of the back trend image acquired during the fourth shooting.
  • the vertical axis of the graphs in Fig. 9 (C1) to Fig. 9 (C 4) is the pixel value P, of the back trend image.
  • the horizontal axis of the graphs in Fig. 9 (C1) to Fig. 9 (C4) is the position X in the finger width direction (X-axis direction).
  • the initial gain value Go is set to the gain G of all detection pixels (Fig. 9 (A1)).
  • Area W2 is an area that can be used for personal authentication, and is narrower than the width of the finger. Therefore, the personal authentication device cannot detect the blood vessel components 81 A and 8 1 E.
  • blood vessel components 81B to D are removed by LPF calculation (FIG. 9 (C1)).
  • the minimum gain value Gb is set to the gain G of the detection pixel included in the halation area.
  • the halation area is an area other than the area W2.
  • the gain G of the detection pixel included in the region W2 is multiplied by ⁇ ⁇ ⁇ ⁇ '(Fig. 9 ( ⁇ 2)).
  • the gain G of the detection pixel included in the region WZ is ⁇ / ⁇ 'times the gain of the detection pixel at the first imaging.
  • the back trend component approaches the target value ⁇ . Since the gain G is set to the minimum gain value Gb in areas other than the area W 2, the pixel value P must be equal to the target value Po. Specifically, steps 90A and 90B occur in the pixel value P in the region immediately adjacent to the region W2. Also, in the edge area W3, the pixel value P exceeds the target value Po (Fig. 9 (B2
  • the minimum gain value Gb is set to the gain G of the detection pixel at the end W3. This is because the pixel value P exceeds the target value Po in the edge region W3. Further, the gain G of the detection pixel included in the region other than the end region W 3 is multiplied by ⁇ '(FIG. 9 (A3)). That is, the gain G of the detection pixel included in the region other than the region W3 is ⁇ 'times the gain of the detection pixel in the second imaging.
  • steps 92 ⁇ and 92 ⁇ occur (Fig. 9 (B3)).
  • the steps 92 A and 92 B are smaller than the steps 9 OA and 90 B generated in the second image.
  • Steps 92 A and 92 B are the changes that occurred in the back trend image acquired during the second shooting! 3 ⁇ 4 Due to 91 A and 91 B.
  • the level difference that occurs in the shot image becomes smaller.
  • all blood vessel components 81A to E can be detected.
  • the LPF calculation is a process of extracting only the back trend component by removing the high frequency component corresponding to the blood vessel image from the photographed image.
  • a digital filter or the like that is a known technique is used.
  • the cutoff frequency is set to a value of about 1Z4 to: LZ2 [c y c les / mm].
  • LZ2 [c y c les / mm].
  • blood vessel information having a diameter of 2 to 4 [mm] or less is removed.
  • the personal authentication device may achieve the same effect as the LPF calculation using a known method such as moving average or low-order polynomial approximation.
  • LPF calculation is normally executed in both the X-axis direction and the Y-axis direction.
  • the Y-axis direction is almost parallel to the blood vessel travel direction.
  • the LPF operation may be omitted.
  • FIG. 10 is an explanatory diagram of a detection pixel block according to the first embodiment of this invention.
  • the detection pixel block 1001 is a unit in which a gain is set for the detection pixel 100.
  • the detection pixel block 1 0 1 may be composed of a single detection pixel 1 0 0 or a plurality of detection pixels 1 0 0.
  • the processing timing of the personal authentication apparatus is as shown in FIG.
  • the personal authentication device since the personal authentication device individually sets gains for all the detection pixels 100, it is possible to capture an image in a good state.
  • the amount of calculation for calculating the gain increases.
  • it takes time to set the gain there is a problem that it takes time to set the gain.
  • the detection pixel block 10 0 1 force may be composed of a plurality of detection pixels 1 0 0 force.
  • the detection pixel block 10 is composed of four detection pixels 1 0 0 (2 (X-axis direction) X 2 (Y-axis direction)).
  • the total value of pixel values P and (X, Y) of all detection pixels 1 0 0 included in detection pixel block 1 0 1 is used.
  • pixel values ⁇ , ( ⁇ , ⁇ ) of some detection pixels included in the detection pixel block 1001 may be used.
  • FIG. 11 is an explanatory diagram of the processing timing of personal authentication when the detection pixel block according to the first embodiment of the present invention is composed of four detection pixels.
  • This explanatory diagram shows the relationship between the gain setting timing, the signal readout timing, and the gain calculation timing.
  • S 0 to S 2 5 5 indicate timings at which gains are set for the respective signal readout rows.
  • S 2 5 5 indicates the timing at which the gain is set for the detection pixels included in the 5 10 1st and 5 1 1st signal readout rows.
  • the personal authentication device can set the gain for the detection pixels included in the two signal readout rows at a time. For this reason, the personal authentication device Shooting is performed at high speed.
  • Y 0 to Y 5 111 indicate the timing at which signals are read from each of the signal read rows.
  • ⁇ 5 11 indicates the timing at which a signal is read from the detection pixel included in the signal reading row of the 5 1st row.
  • C O to C 2 5 5 indicate the timing for calculating the gain set in the next frame period F (N + 1) for each signal readout row.
  • C 2 5 5 is a timing for calculating the gain set in the next frame period F (N + 1) for the detection pixels included in the 5 1 0th and 5 1 1st signal readout rows. Show. If the detection pixel block consists of four detection pixels, the personal identification can calculate the gain set for the two signal readout lines at one time. For this reason, the number of gain calculations by the personal identification SE can be reduced to half.
  • the frame period F (N) is a period during which the Nth shooting is performed.
  • T s is the start time of the frame period F (N).
  • Te is the end time of the frame period F (N).
  • FIG. 12 is an explanatory diagram of a detection pixel block according to the first embodiment of this invention.
  • the detection pixel block 120 is composed of all detection pixels 100 having the same position in the X-axis direction.
  • subject 1 is a finger. For this reason, all detected pixels having the same position in the X-axis direction have close pixel values. For this reason, even if the detection pixel block 120 is composed of all the detection pixels 100 having the same position in the X-axis direction, the authentication accuracy of the individual authentication 11 position is not greatly deteriorated.
  • FIG. 13 shows processing for personal authentication when the detection pixel block according to the first embodiment of the present invention is composed of all detection pixels 10 0 having the same position in the X-axis direction. It is explanatory drawing of the timing of.
  • This explanatory diagram shows the relationship between the gain setting timing, the signal readout timing, and the gain calculation timing.
  • S 0 indicates the timing at which the gain is set for all signal readout rows.
  • the personal authentication device can set the gain for all the detection pixels at one time. This speeds up shooting with personal recognition.
  • Y 0 to Y 5 111 indicate the timing at which signals are read from each of the signal read rows.
  • ⁇ 5 11 indicates the timing at which a signal is read from the detection pixel included in the signal reading row of the 5 1 1st row.
  • C O indicates the timing for calculating the gain set in the next frame period F (N + 1) for all signal readout rows.
  • the personal authentication device can calculate the gain set for all the signal readout rows at one time. For this reason, the number of gains calculated by the personal identification SE device can be reduced to one.
  • the frame period F (N) is a period during which the Nth shooting is performed.
  • T s is the start time of the frame period F (N).
  • Te is the end time of the frame period F (N).
  • the gain is adjusted for each detection pixel block.
  • the personal authentication device according to the first embodiment can optimize the gain of each detection pixel without losing information on the high-frequency component of the biometric pattern.
  • the personal authentication device according to the first embodiment can expand the dynamic range of the image sensor.
  • the personal authentication device according to the first embodiment can prevent the occurrence of halation and a decrease in contrast, and thus can improve the authentication accuracy.
  • the personal authentication device according to the first embodiment can improve the authentication accuracy while maintaining low cost and low power consumption.
  • FIG. 14 is a block diagram of the personal authentication device according to the second embodiment of the present invention.
  • the personal authentication device performs authentication based on the blood vessel pattern of the subject 1.
  • the personal authentication device includes an image sensor, a photographing control unit CTL1, a liquid crystal density adjustment unit CTL3, a frame memory MEM1, a liquid crystal density recording memory MEM3, a signal processing unit DSP, and a result report unit REP.
  • the imaging control unit CTL 1, frame memory MEM 1, signal processing unit DSP and authentication result reporting unit REP are the same as those provided in the personal authentication device of the first embodiment (Fig. 1). Omitted.
  • the image sensor includes a light source 2, a light shielding frame 3, a micro lens 4, a visible light blocking filter 5, an image sensor substrate 6, a support substrate 7, electrodes 8A and 8B, a liquid crystal display substrate 9, and a backlight substrate 10.
  • the light source 2, the light shielding frame 3, the microlens 4, the visible light blocking filter 5, the image sensor substrate 6, the support substrate 7, and the electrodes 8 A and 8 B are the personal authentication device of the first embodiment (first The explanation is omitted because it is the same as that shown in the figure. However, in the second embodiment, the image sensor substrate 6 may not have a gain setting function.
  • the personal authentication device adjusts the amount of light incident on the image sensor substrate 6 by adjusting the liquid crystal display density of the liquid crystal display substrate 9.
  • the personal authentication device can prevent the occurrence of halation and a decrease in contrast, thereby improving the authentication accuracy.
  • the occurrence of halation and the decrease in contrast are due to the lack of the dynamic range of the image sensor substrate 6.
  • the backlight substrate 10 is disposed between the support substrate 7 and the image sensor substrate 6. It is.
  • the backlight substrate 10 includes a known white light source and a light guide plate. As a result, the backlight substrate 10 irradiates the liquid crystal display substrate 9 with uniform backlight light. The light emitted from the backlight substrate 10 passes through the image sensor substrate 6 and illuminates the liquid crystal display substrate 9 from the lower surface side.
  • the liquid crystal display substrate 9 is disposed on the upper surface of the image sensor substrate 6.
  • the personal authentication device has a normal liquid crystal display function and an incident light amount adjustment function.
  • the liquid crystal display substrate 9 functions as a normal liquid crystal display.
  • the LCD display board .9 may have a shooting guide display function. The details of the shooting guide display function are explained in Fig. 19.
  • the personal authentication apparatus may include a filter that transmits light instead of the liquid crystal display substrate 9.
  • the finoleta shall be able to adjust the light transmission.
  • the liquid crystal display substrate 9 and the backlight substrate 10 are in a standby state. As a result, personal authentication can reduce power consumption during standby. At this time, the liquid crystal display substrate 9 functions as a normal liquid crystal display, thereby providing various information to the user as necessary.
  • the backlight substrate 10 may or may not irradiate the liquid crystal display substrate 9 with backlight light.
  • the personal authentication device detects the location of the subject 1. Then, the backlight substrate 10 stops irradiating the backlight. All configurations that are in standby will then begin operation.
  • the imaging control unit CTL 1 turns on the light source 2.
  • the light source 2 is Start irradiating subject 1 with infrared light.
  • the imaging control unit CTL 1 gives a control signal to the image sensor substrate 6.
  • the image sensor board 6 starts photographing.
  • the liquid crystal concentration adjusting unit CTL 3 sets a preset initial liquid crystal concentration Lo on the liquid crystal display substrate 9. The liquid crystal concentration setting method by the liquid crystal concentration adjusting unit CTL 3 will be described later.
  • the image sensor substrate 6 captures an image. Then, the image sensor substrate 6 records the first captured image in the frame memory MEM 1. At this time, the signal processing unit DSP calculates the liquid crystal density L set at the time of the second shooting based on the first shot image. Then, the signal processing unit DSP records the calculated liquid crystal concentration L in the liquid crystal concentration recording memory MEM 3. As a result, the personal identification
  • the personal authentication device will continue to take the second shot.
  • the liquid crystal density adjusting unit CTL3 sets the liquid crystal density L recorded in the liquid crystal density recording memory MEM3 on the liquid crystal display substrate 9.
  • the image sensor substrate 6 captures an image.
  • the image sensor board 6 records the second shot image in the frame memory MEM1.
  • the signal processing unit DSP calculates the liquid crystal density L set at the time of the third shooting based on the second shot image.
  • the signal processing unit D S P records the calculated liquid crystal density L in the liquid crystal density recording memory MEM 3.
  • the personal authentication device ends the second shooting.
  • the personal authentication apparatus performs N 0 times shooting.
  • the signal processing unit DSP performs a personal authentication calculation based on the N 0th shooting image recorded in the frame memory MEM1.
  • the authentication result report unit REP outputs the result of the personal authentication calculation by the signal processing unit DSP.
  • the standard value of the time required for one shooting with the personal authentication device is approximately 1 Z 60 seconds. Also, the total number of shots N performed by the personal authentication device. The standard value is 4 times. twenty one
  • FIG. 15 is an explanatory diagram of the positional relationship between the detection pixels of the image sensor substrate 6 and the display pixels of the liquid crystal display substrate 9 according to the second embodiment of the present invention.
  • detection pixels 150 are arranged in an array. Further, on the liquid crystal display substrate 9, display pixels 15 1 and 5 1 are arranged in an array in synchronization with the pitch of the detection pixels 1 50.
  • the image sensor substrate 6 is composed of 2 5 6 (X-axis direction) X 5 1 2 (Y-axis direction) detection pixels 1 5 0.
  • the pitch of the detection pixels 150 is 0.1 [mm] in both the X-axis direction and the Y-axis direction.
  • the display substrate 9 is composed of 5 1 2 (X-axis direction) X 1 0 2 4 (Y-axis direction) display pixels 15 1.
  • the pitch of the display pixel 15 1 is 0.05 [mm] in both the X-axis direction and the Y-axis direction.
  • the display pixel block 15 2 includes four display pixels 15 1.
  • the display pixel block 1 5 2 is a unit in which the liquid crystal density is set in the display pixel 1 5 1.
  • the display pixel block 1 5 2 includes one or a plurality of detection pixels 1 5 0. Adjust the amount of light incident on.
  • the display pixel block 15 2 may be composed of a single display pixel 15 1, or may be composed of a plurality of display pixels 1 5 1.
  • the pitch of the detection pixels 1550 and the pitch of the display pixels 151 may be the same.
  • the display pixel block 15 2 is composed of one display pixel 15 1 force.
  • a detection pixel block including one or more detection pixels 1510 may correspond to a display pixel block including one or more display pixels 1551.
  • FIG. 16 is an explanatory diagram of processing timing of the personal authentication device according to the second embodiment of this invention.
  • This explanatory diagram shows the relationship between signal readout timing, liquid crystal density calculation timing, and liquid crystal density setting timing.
  • Y0 to Y511 indicate the timing at which signals are read from each of the signal readout rows.
  • ⁇ 511 indicates the timing at which a signal is read from the detection pixel included in the first signal readout row.
  • CO to C511 indicate timings for calculating the liquid crystal density set in the next frame period F (N + 1) in the display pixel block corresponding to each signal readout row.
  • C51 ⁇ indicates the timing for calculating the liquid crystal density set in the next frame period F (N + 1) for the display pixel block for adjusting the amount of light incident on the 511th signal readout row.
  • L 0 to L 5 ⁇ 1 indicate the timing at which the liquid crystal density is set for the display pixel block corresponding to each signal readout row.
  • S 51 1 indicates the timing at which the liquid crystal density is set for the display pixel block that adjusts the amount of light incident on the signal readout row 51 1.
  • the frame period F (N) is a period during which the Nth shooting is performed.
  • T s is the start time of the frame period F (N).
  • Te is the end time of the frame period F (N).
  • the personal authentication device can perform signal readout processing, liquid crystal density calculation processing, and liquid crystal density setting processing in parallel.
  • FIG. 17 is a flowchart of the photographing process of the personal authentication device according to the second embodiment of the present invention.
  • the personal authentication device sets a photographing number N indicating the current number of photographing to “1” (170).
  • the personal authentication device records the initial liquid crystal density Lo in the liquid crystal density recording memory MEM3.
  • the personal authentication device uses liquid crystal for all display pixels. Set the initial liquid crystal density Lo to the density L (X, Y) (171).
  • the personal authentication device photographs subject 1.
  • the personal authentication device photographs subject 1.
  • the number of Tota Nore shootings N 0 is the number of shootings performed in one personal authentication process, and is set in advance.
  • the personal authentication device ends the photographing process (179). On the other hand, shooting number N and total number of shots N. Otherwise, the personal authentication device performs an LPF (Low Pass sFi te r) operation on the image taken in step 172 (174). As a result, the personal authentication device acquires the pixel value P, (X, Y) of the back trend image.
  • LPF Low Pass sFi te r
  • the personal authentication device selects all the detection pixels one by one in order.
  • the personal identification SE unit determines whether or not the pixel value ⁇ ( ⁇ , ⁇ ) of the selected detection pixel is saturated (175).
  • the personal authentication device sets the maximum liquid crystal density L b to the liquid crystal density L ( ⁇ , ⁇ ) of the display pixel corresponding to the selected detection pixel. (178).
  • the personal authentication device can set the liquid crystal density even for the display pixel corresponding to the detection pixel whose pixel value is unknown due to the halation. Then, the personal authentication device can set an appropriate liquid crystal display density at the next shooting for the display pixel corresponding to the detection pixel for which the halation has been eliminated by setting the maximum liquid crystal density Lb. In this way, the personal authentication device can set an appropriate liquid crystal display density at high speed even for display pixels corresponding to detection pixels in which halation has occurred. As a result, the personal authentication device can improve the authentication speed.
  • the personal authentication device displays the target value Po-no-back trend image in the liquid crystal density L (X, Y) of the display pixel corresponding to the selected detection pixel. Multiply by the pixel value P '(X, Y) of (176). In this way, the personal identification 113 ⁇ 4 performs steps 1 75 to 1 78 for all the detected pixels. When the processing for all the detection pixels is completed, the personal authentication device adds “1” to the photographing number N (1 7 7).
  • the personal authentication device returns to Step 1 7 2.
  • the personal authentication device has total number of times N. This process is repeated until only images are taken. N for personal authentication device.
  • the personal authentication apparatus according to the second embodiment of the present invention that performs personal authentication processing based on the image taken at the second (final) time can be applied to a terminal having a liquid crystal screen.
  • FIG. 18 is an explanatory diagram of a cellular phone device 180 to which the personal authentication device according to the second embodiment of the present invention is applied.
  • the mobile phone 1 8 0 includes a display 1 8 1.
  • a liquid crystal display substrate 9 is used for the display 1 8 1.
  • the electrodes 8 A and 8 b and the light source 2 are installed on the outer frame of the cellular phone 1 80. In this way, the personal authentication device of the second embodiment can be applied to the cellular phone 180.
  • the personal authentication device performs personal authentication of a user when the cellular phone 1800 is turned on. This prevents the cellular phone 1 80 from being used by others.
  • FIG. 19 is an explanatory diagram of a display screen of the cellular phone device 180 to which the personal authentication ⁇ device according to the second embodiment of the present invention is applied.
  • the display display 1 8 1 provided in the cellular phone 1 8 0 displays various information, so that the authentication process proceeds smoothly.
  • Fig. 19 (iii) is an explanatory diagram of the display screen before the authentication process of the personal authentication device is started.
  • FIG. 19 (B) is an explanatory diagram of the display screen after the end of the authentication process of the personal authentication device.
  • the display display 1 8 1 provided in the cellular phone 1 8 0 displays the authentication permission. As a result, the user can grasp that the authentication has been properly completed.
  • FIG. 19 (C) is an explanatory diagram of the display screen after the authentication process of the personal authentication device is completed.
  • the display display 1 8 1 provided in the mobile phone 1 80 displays that authentication is not possible. As a result, the user can grasp that the user was not authenticated. The user can then authenticate again.
  • the personal authentication device according to the second embodiment can adjust the amount of light incident on the image sensor substrate 6 for each detection pixel or detection pixel block. For this reason, the personal authentication device according to the second embodiment can prevent the occurrence of halation and decrease in contrast, so that the authentication accuracy can be improved.

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Abstract

L'invention concerne un système d'authentification personnelle ayant une section imageur servant à prendre une image d'un objet et à identifier, d'après un modèle biologique de l'objet inclus dans l'image prise, un individu correspondant à l'objet. La section imageur comprend une surface d'imageur construite à partir de blocs de pixels. Le système d'authentification personnelle a en outre une section de traitement des signaux pour la suppression des composants haute fréquence de l'image prise et a une section d'ajustement des gains pour le paramétrage d'un gain de pixels pour chaque bloc de pixels de telle manière que la valeur des pixels de l'image prise, dont sont supprimés les composants haute fréquence, est proche d'une valeur prédéterminée.
PCT/JP2006/313921 2006-07-06 2006-07-06 Système d'authentification personnelle WO2008004314A1 (fr)

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WO2022139662A1 (fr) * 2020-12-22 2022-06-30 Fingerprint Cards Anacatum Ip Ab Capteur d'empreintes digitales avec lecture de colonne

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