JP4624882B2 - Personal authentication device and personal authentication method - Google Patents

Description

The present invention relates to a personal authentication device and a personal authentication method for specifying an individual based on a blood vessel pattern formed in a human body.

Conventionally, as a device for authenticating an individual using biometric information (physical features), for example, a personal authentication device disclosed in Patent Document 1 has been proposed.
In this personal authentication device, a blood vessel pattern of one part (finger) of the body of the person to be authenticated is imaged, and authentication is established when the imaged blood vessel pattern matches a preregistered blood vessel pattern (including approximation). It comes to judge.
JP 2004-110326 A

  However, in such a personal authentication device, for example, it is determined that authentication is established even when a blood vessel pattern of the registrant is illegally acquired by a third party and a forged finger that duplicates the blood vessel pattern of the registrant is used for authentication. There is a risk of it. That is, in the conventional personal authentication device, there is a possibility that the authentication is determined to be established even by an illegally copied blood vessel pattern.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a personal authentication device and a personal authentication method capable of improving the security level by preventing the establishment of authentication due to fraud.

In order to solve the above-described problem, in the invention according to claim 1, blood vessel image acquisition means for acquiring a blood vessel image of the acquisition target part by imaging one part of the body of the authentication target person as the acquisition target part. And a recording means for recording a blood vessel image of the acquisition target portion at the registrant as registration data, a temperature adjustment means for adjusting the temperature of the acquisition target portion, the blood vessel image acquisition means, and the temperature adjustment means. And the blood vessel image acquired by the blood vessel image acquisition unit and the blood vessel image of the registered data recorded in the recording unit coincide with each other or approximate to each other. sure that it is determined that authentication is established as a condition of the detection of the expansion or contraction of the blood vessel by comparing the blood vessel image acquiring means has been temperature change before and after the blood vessel image acquired by the And summarized in that and means.

  According to a second aspect of the present invention, in the personal authentication device according to the first aspect, the temperature adjusting unit has a function of cooling and heating the acquisition target unit, and the authentication unit is configured to store the acquisition target unit. When the temperature is higher than a preset high temperature threshold value, the blood vessel image of the acquisition target portion imaged in a state in which temperature adjustment by the temperature adjustment unit is not performed, and the image captured in a state cooled by the temperature adjustment unit While detecting the presence or absence of blood vessel expansion or contraction by comparing with the blood vessel image of the acquisition target part, if the temperature of the acquisition target part is lower than a preset low temperature threshold, the temperature by the temperature adjustment means Compare the blood vessel image of the acquisition target part imaged in a state without adjustment with the blood vessel image of the acquisition target part imaged in a state heated by the temperature adjusting means And summarized in that to detect the presence or absence of blood vessels expand or contract by the.

According to a third aspect of the present invention, in the personal authentication device according to the first or second aspect, the blood vessel image is a vein pattern and an arteriovenous anastomosis of the acquisition target portion, and the authentication means includes the blood vessel The vein pattern acquired by the image acquisition means matches or approximates the vein pattern of the registration data, and the expansion or contraction of the arteriovenous anastomosis is acquired by the blood vessel image acquisition means due to a temperature change by the temperature adjustment means. The gist is that it is determined that the authentication is established on the condition that the blood vessel images are detected before and after the temperature change .

According to a fourth aspect of the present invention, in the personal authentication device according to the first or second aspect, the blood vessel image is an arteriovenous anastomosis of the acquisition target portion, and the authentication means is the blood vessel image acquisition means. The position of the arteriovenous anastomosis acquired by the above and the position of the arteriovenous anastomosis in the registered data coincide with or approximate each other, and the blood vessel image acquisition unit performs expansion or contraction of the arteriovenous anastomosis by a temperature change by the temperature adjustment unit The gist is to determine that the authentication has been established on the condition that the detection is performed by comparing the blood vessel images obtained before and after the temperature change .
According to the fifth aspect of the present invention, a blood vessel image of the acquisition target part is acquired by the blood vessel image acquisition means by imaging one part of the body of the authentication target person as the acquisition target part, and acquired by the blood vessel image acquisition means When the determined blood vessel image matches or approximates the blood vessel image of the registered data recorded in the recording means, and if both blood vessel images match or approximate in the determination, the temperature adjustment means determines the temperature of the acquisition target portion. The blood vessel expansion is detected by comparing the blood vessel images before and after the temperature change acquired by the blood vessel image acquisition means by performing adjustment and detecting the presence or absence of blood vessel expansion or contraction of the acquisition target portion by the temperature change by the temperature adjustment means. Alternatively, the gist is that the authentication means determines that authentication has been established on the condition that contraction has been detected.

The “action” of the present invention will be described below.
According to the first aspect of the present invention, the blood vessel image of the acquisition target portion acquired by the blood vessel image acquisition unit and the blood vessel image of the registration data recorded in the recording unit match or approximate, and the blood vessel is caused by a temperature change. Detection of expansion or contraction of the acquisition target part is a condition for establishing authentication. For this reason, the authentication means can identify (personally identify) the body information of the person to be authenticated based on the presence or absence of matching or approximation of the blood vessel image, and determine whether the person to be authenticated has a biological reaction based on the presence or absence of blood vessel expansion or contraction. It can be detected. That is, authentication is performed based on the presence / absence of individual identification and the presence / absence of a biological reaction. For this reason, even if the authentication operation is performed using the blood vessel image of the registrant that is illegally acquired by a third party, the authentication unit does not detect the biological reaction and thus does not determine that the authentication is successful. Accordingly, the establishment of unauthorized authentication using a forged finger or the like is reliably prevented, and the security level is improved more favorably.

  According to the second aspect of the present invention, when the temperature of the acquisition target part is higher than the high temperature threshold value, the blood vessel image of the acquisition target part acquired before the temperature adjustment and the blood vessel image acquired in the state cooled by the temperature adjustment means are acquired. The blood vessel image of the acquisition target part is compared. On the other hand, when the temperature of the acquisition target portion is lower than the low temperature threshold, the blood vessel image of the acquisition target portion acquired before the temperature adjustment and the blood vessel image of the acquisition target portion acquired in a state heated by the temperature adjustment means Are compared. Then, the presence or absence of blood vessel expansion or contraction is detected by comparing the blood vessel images. Therefore, in either case, a clear temperature difference is generated in the acquisition target part at the time of detection, so that it is possible to reliably detect the presence or absence of a biological reaction in the acquisition target part.

  According to the third aspect of the present invention, a vein pattern is used for specifying an individual, and whether or not the arteriovenous anastomosis is contracted is used to determine the presence or absence of a biological reaction. In general, individual differences clearly appear in the vein pattern, and in arteriovenous anastomosis, expansion or contraction with respect to temperature change appears significantly compared to the contraction of the vein itself. For this reason, by using both for authentication, it is possible to reliably identify an individual and determine the presence or absence of a biological reaction.

  According to the invention described in claim 4, since the position of the arteriovenous anastomosis varies among individuals, the authentication means performs the acquired arteriovenous anastomosis position and the arteriovenous anastomosis as registered data recorded in the recording means. By determining whether or not the positions match, an individual can be specified. In addition, since the arteriovenous anastomosis significantly expands or contracts with respect to a change in temperature as compared with the contraction of the vein itself, it is possible to reliably detect the presence or absence of a biological reaction in the acquisition target portion.

As described above in detail, according to the present invention, it is possible to provide a personal authentication device and a personal authentication method capable of improving the security level by preventing the establishment of authentication due to fraud.

Hereinafter, an embodiment in which the personal authentication device of the present invention is applied to an entrance / exit management system will be described in detail with reference to FIGS.
<Outline of entrance / exit management system 1>
As shown in FIGS. 1 and 2, the entrance / exit management system 1 includes a personal authentication device 2 provided in the vicinity of an entrance / exit management gate provided in a passage to a security room, and the entrance / exit management gate. Security device 3 provided. More specifically, the personal authentication device 2 includes an image input device 4 provided in the vicinity of the entrance / exit management gate, and an authentication control unit 5 as authentication means electrically connected to the image input device 4. . The personal authentication device 2 is electrically connected to the security device 3. When the physical characteristics of the person to be authenticated are acquired by the image input device 4, the authentication control unit 5 performs authentication processing. Outputs an authentication establishment signal. The security device 3 is a device that permits and prohibits the passage of the entrance / exit management gate. When an authentication establishment signal is input from the authentication control unit 5, the security device 3 releases the security and passes the entrance / exit management gate of the person to be authenticated. Allow. For this reason, in the state where the authentication establishment signal is not input from the authentication control unit 5 to the security device 3, the passage of the person at the entrance / exit management gate is prohibited. That is, the entrance / exit management system 1 is a system that performs authentication based on the physical characteristics of the person to be authenticated and permits / prohibits passage of the entrance / exit management gate based on the authentication result.

<Configuration of personal authentication device 2>
As shown in FIG. 1, the image input device 4 has a base portion 11a and a substantially “U” shape in a plan view including a first wall portion 11b and a second wall portion 11c provided at both ends of the base portion 11a. The apparatus main body 11 which makes | forms is provided. The first wall portion 11b and the second wall portion 11c are formed to face each other, and a recess 11d into which the finger 6 of the person to be authenticated can be inserted is provided between them. The first wall 11b is provided with a camera 12 as a blood vessel image acquisition means capable of imaging the finger 6 inserted into the recess 11d, and the second wall 11c has a light source 13 for illuminating the inside of the recess 11d. Is arranged. Further, a temperature adjusting mechanism 14 capable of cooling and heating the finger 6 is disposed in the recess 11d, and a detection unit 15 for detecting whether or not the finger 6 is inserted is disposed on the side wall surface of the recess 11d in the base 11a. ing.

  As shown in FIG. 2, the camera 12, the light source 13, the temperature adjustment mechanism 14, and the detection unit 15 are electrically connected to the authentication control unit 5. The camera 12, the light source 13, and the temperature adjustment mechanism 14 operate based on a control signal output from the authentication control unit 5.

  In this embodiment, the camera 12 is configured by a near-infrared camera and operates when an operation control signal is input from the authentication control unit 5. In operation, the camera 12 images the blood vessel in the finger 6 of the person to be authenticated inserted into the recess 11 d and outputs the image data to the authentication control unit 5. Specifically, in this embodiment, the camera 12 images a vein blood vessel pattern (venous pattern) 21 of the finger 6 as shown in FIG. 3 and an arteriovenous anastomosis 22 of the finger 6 schematically shown in FIG. The captured image data is output to the authentication control unit 5. As shown in FIG. 4, the arteriovenous anastomosis 22 is an anastomosis vessel in which an artery directly pours into a vein without an intervening capillary 25 between an artery 23 and a vein 24, and the temperature of the finger 6 is It expands when it is low (see FIG. 4A) and contracts when the temperature of the finger 6 is high (see FIG. 4B).

In the present embodiment, the light source 13 is constituted by an infrared lamp, which is activated when an operation control signal is input from the authentication control unit 5 to illuminate the inside of the recess 11d.
When the operation control signal is input from the authentication control unit 5, the temperature adjustment mechanism 14 detects the ambient temperature and outputs temperature data indicating the ambient temperature to the authentication control unit 5. The temperature adjustment mechanism 14 is cooled when a cooling control signal is input from the authentication control unit 5 to reduce the temperature in the recess 11 d to a predetermined temperature, and the heating control signal is input from the authentication control unit 5. Then, the heating operation is performed to raise the temperature in the recess 11d to a predetermined temperature.

  When detecting the insertion of the finger 6 into the recess 11d, the detection unit 15 outputs a detection signal to the authentication control unit 5. Examples of such a detection unit 15 include a contact sensor that detects the contact of the finger 6, a proximity sensor that detects the proximity of the finger 6, and a switch that switches between open and closed states when pressed by the finger 6.

  The authentication control unit 5 is a computer unit that includes a CPU, ROM, RAM, and the like (not shown), and includes a non-volatile memory 5a. In the memory 5a, a preset low temperature threshold and high temperature threshold and a vein blood vessel pattern (vein pattern) 21 in the registrant's finger 6 are recorded.

  Such an authentication control unit 5 performs an authentication process by performing operation control of the camera 12, the light source 13, and the temperature adjustment mechanism 14 on condition that a detection signal is input from the detection unit 15. The authentication process performed by the authentication control unit 5 will be described with reference to the flowchart shown in FIG.

<Authentication process>
As shown in the figure, in step S1, the authentication control unit 5 determines whether or not a detection signal is input from the detection unit 15, and if it is determined that the detection signal is not input, the processing here is temporarily terminated. If it is determined that the detection signal is input, the process proceeds to step S2.

  In step S2, the authentication control unit 5 performs first image data acquisition processing. Specifically, the authentication control unit 5 outputs an operation control signal to the camera 12 and the light source 13. Thereby, the vein pattern 21 of the finger 6 and the arteriovenous anastomosis 22 are imaged by the camera 12, and the imaging data is input from the camera 12 to the authentication control unit 5. And the authentication control part 5 acquires the imaging data input here as 1st imaging data.

  In subsequent step S3, the authentication control unit 5 compares (collates) the vein pattern 21 of the first image data with the vein pattern 21 of the registrant recorded in the memory 5a. As a result, if the vein pattern 21 of the first imaging data does not match (including the approximation) the vein pattern 21 of the registrant, the authentication control unit 5 temporarily ends the process. The process proceeds to S4. That is, in the present embodiment, the authentication control unit 5 performs the next step only when the vein pattern 21 of the first image data matches the vein pattern 21 of the registrant, and when this does not match, the processing here Exit.

  In step S4, the authentication control unit 5 adjusts the temperature of the acquisition target unit. Specifically, the authentication control unit 5 outputs an operation control signal to the temperature adjustment mechanism 14. As a result, the temperature adjusting mechanism 14 is operated, and temperature data indicating the ambient temperature in the recess 11 d, that is, the temperature of the finger 6 is input to the authentication control unit 5. The authentication control unit 5 outputs a heating control signal to the temperature adjustment mechanism 14 when the temperature of the finger 6 indicated by the temperature data is lower than the low temperature threshold recorded in the memory 5a. On the other hand, when the temperature of the finger 6 is higher than the high temperature threshold recorded in the memory 5a, the authentication control unit 5 outputs a cooling control signal to the temperature adjustment mechanism 14. For this reason, the temperature of the finger 6 is adjusted to a preset low temperature set temperature or high temperature set temperature by the heating or cooling operation of the temperature adjusting mechanism 14. In the present embodiment, the low temperature threshold and the high temperature threshold are set to the same temperature.

  Then, when the authentication control unit 5 determines that the temperature adjustment of the acquisition target unit is completed based on the temperature data input from the temperature adjustment mechanism 14, the authentication control unit 5 performs a process of acquiring the second imaging data in step S5. Specifically, the authentication control unit 5 outputs an operation control signal to the camera 12 and the light source 13 again. And the imaging data input from the camera 12 is acquired as 2nd imaging data.

  In subsequent step S6, the authentication control unit 5 compares the first imaging data acquired in step S2 with the second imaging data acquired in step S5, and determines whether or not the arteriovenous anastomosis 22 has changed. Specifically, the authentication control unit 5 compares the arteriovenous anastomosis 22 in the first imaging data with the arteriovenous anastomosis 22 in the second imaging data to determine whether the arteriovenous anastomosis 22 has expansion or contraction. Determine whether. Normally, the arteriovenous anastomosis 22 causes a biological reaction such that it expands when the temperature decreases and contracts when the temperature increases. For this reason, the authentication control unit 5 detects the presence or absence of expansion or contraction of the arteriovenous anastomosis 22 by comparing the imaging data before and after such temperature adjustment.

  As a result, if the authentication control unit 5 cannot detect the expansion or contraction of the arteriovenous anastomosis 22, that is, if it is determined that there is no biological reaction in the finger 6, the finger 6 used for authentication is a fake finger. It is determined that there is, and the processing here is temporarily terminated. On the other hand, if the authentication control unit 5 detects expansion or contraction of the arteriovenous anastomosis 22, that is, if it is determined that there has been a biological reaction in the finger 6, the authentication control unit 5 determines that authentication has been established and proceeds to the processing of step S 7. An authentication establishment signal is output to the security device 3. For this reason, the security is released by the security device 3, and the person to be authenticated is allowed to pass through the entrance / exit management gate.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) When the blood vessel image of the finger 6 of the person to be authenticated is captured by the camera 12, the vein pattern 21 included in the captured data and the data (registration data) of the registrant's vein pattern 21 recorded in the memory 5a Are compared. Then, when these vein patterns match or approximate and it is detected that expansion or contraction has occurred in the arteriovenous anastomosis 22 of the finger 6 due to a temperature change by the temperature adjustment mechanism 14, it is determined that authentication has been established. That is, an individual is identified by the presence or absence of matching or approximation of the vein pattern 21, and the presence or absence of a biological reaction of the finger 6 is detected by the presence or absence of expansion or contraction of the arteriovenous anastomosis 22. Then, when an individual is specified and a biological reaction is detected, it is determined that authentication is established. For this reason, even if the authentication operation is performed using the registrant's vein pattern 21 illegally acquired by a third party, the authentication control unit 5 determines that the authentication is successful because it does not detect a biological reaction. do not do. Therefore, it is possible to reliably prevent the establishment of authentication due to fraud using a counterfeit finger or the like, and to improve the security level more suitably.

  (2) When the temperature of the finger 6 is higher than the high temperature threshold, the image is taken in a state cooled by the temperature adjustment mechanism 14 and the arteriovenous anastomosis 22 of the finger 6 imaged before the temperature adjustment by the temperature adjustment mechanism 14 By comparison with the arteriovenous anastomosis 22 of the finger 6, it is determined whether or not the arteriovenous anastomosis 22 has expanded. On the other hand, when the temperature of the finger 6 is lower than the low temperature threshold, the arteriovenous anastomosis 22 of the finger 6 imaged before the temperature adjustment by the temperature adjustment mechanism 14 and the image captured in a state heated by the temperature adjustment mechanism 14 By comparison with the arteriovenous anastomosis 22 of the finger 6, it is determined whether or not the arteriovenous anastomosis 22 has contracted. Therefore, in either of these cases, a clear temperature difference occurs in the finger 6 at the time of detection, so that expansion or contraction appears clearly in the arteriovenous anastomosis 22. Therefore, the presence or absence of the biological reaction of the finger 6 can be reliably detected.

  (3) The vein pattern 21 is used to specify an individual, and the presence or absence of contraction of the arteriovenous anastomosis 22 is used to determine the presence or absence of a biological reaction. In general, individual differences clearly appear in the vein pattern 21, and in the arteriovenous anastomosis 22, expansion or contraction with respect to a temperature change significantly appears compared to the contraction of the vein itself. For this reason, by using both for authentication, it is possible to reliably identify an individual and determine the presence or absence of a biological reaction.

  (4) The authentication control unit 5 collates the vein pattern 21 based on the imaging data (first imaging data) of the finger 6 imaged before the temperature adjustment by the temperature adjustment mechanism 14. As a result, when the vein pattern 21 of the imaging data matches or approximates the vein pattern 21 recorded in the memory 5a, the authentication control unit 5 captures the finger imaged with the temperature adjusted by the temperature adjustment mechanism 14. 6 image data (second imaging data) and the first imaging data are compared to determine whether the arteriovenous anastomosis 22 is expanded or contracted. That is, the authentication control unit 5 performs the operation control of the temperature adjustment mechanism 14 and the control for detecting the change of the arteriovenous anastomosis 22 on the condition that the verification of the vein pattern 21 is established. In other words, when the verification of the vein pattern 21 is not established, these controls are not performed. For this reason, useless power consumption can be suppressed.

  (5) The finger 6 is set as the acquisition target part. Usually, since a large number of arteriovenous anastomoses 22 exist at the end part of the body, the arteriovenous anastomoses 22 can be reliably imaged by setting such fingers 6 as acquisition target portions.

In addition, you may change embodiment of this invention as follows.
In the embodiment, the low temperature threshold and the high temperature threshold are set to the same temperature. However, the low temperature threshold and the high temperature threshold may be set to different temperatures. However, in this case, it is necessary to lower temperatures threshold is set to a temperature lower than the high temperature threshold. And when it is set in this way, at the time of performing the temperature adjustment in the authentication process (see step S4 in FIG. 5), the authentication control unit 5 temporarily cools the temperature adjustment mechanism 14 to operate the temperature of the finger 6 the intends row processing for acquiring second imaging data is adjusted to the low-temperature set temperature (see step S5). Thereafter, the authentication control unit 5 heats the temperature adjustment mechanism 14 to adjust the temperature of the finger 6 to the high temperature set temperature, and performs the second imaging data acquisition process again. Then, the authentication control unit 5 compares the two types of second imaging data acquired in this way to determine whether or not the arteriovenous anastomosis is contracted. Note that the cooling and heating procedures by the temperature adjustment mechanism 14 may be reversed. In this way, even if the temperature of the finger 6 before temperature adjustment is between the low temperature threshold and the high temperature threshold, the authentication control unit 5 can expand or contract the arteriovenous anastomosis of the finger 6. The presence or absence of can be reliably detected.

  In the above-described embodiment, the authentication control unit 5 images the finger 6 in a state where the temperature adjustment by the temperature adjustment mechanism 14 is not performed, and acquires the image data as the first image data. However, the authentication control unit 5 may perform temperature adjustment by the temperature adjustment mechanism 14 when acquiring the first imaging data. Specifically, the authentication control unit 5 cools the finger 6 to the low temperature setting temperature by the temperature adjustment mechanism 14 when acquiring the first imaging data, and sets the finger 6 at the high temperature by the temperature adjustment mechanism 14 when acquiring the second imaging data. For example, heating to a temperature may be performed. Note that the cooling and heating procedures by the temperature adjusting mechanism 14 may be reversed. In this case, the high temperature threshold and the low temperature threshold in the embodiment are not necessary. In this way, the degree of expansion or contraction of the blood vessel increases, so that the authentication control unit 5 can more reliably detect the presence or absence of the expansion or contraction.

  In the embodiment, the authentication control unit 5 identifies an individual by comparing the vein pattern 21 of the captured finger 6 with the vein pattern 21 of the registrant recorded in the memory 5a, and moves the captured finger 6 The biological reaction of the finger 6 is detected by the presence or absence of expansion or contraction of the venous anastomosis 22. However, for example, the authentication control unit 5 may identify an individual by comparing the imaged position of the arteriovenous anastomosis 22 of the finger 6 with the position of the registrant's arteriovenous anastomosis 22 recorded in the memory 5a. It may be. Usually, since the position of the arteriovenous anastomosis 22 varies among individuals, the authentication control unit 5 determines the position of the imaged arteriovenous anastomosis 22 of the finger 6 and the position of the registered person's arteriovenous anastomosis 22 recorded in the memory 5a. It is also possible to identify an individual by determining whether or not and match. Further, the authentication control unit 5 is not limited to detecting a biological reaction based on the presence or absence of expansion or contraction of the arteriovenous anastomosis 22 of the captured finger 6, for example, expansion of the vein pattern 21 based on a temperature change by the temperature adjustment mechanism 14. Alternatively, a biological reaction may be detected based on the presence or absence of contraction. That is, the authentication control unit 5 performs individual identification and biological reaction presence / absence detection based only on the vein pattern 21, or individual identification and biological reaction presence / absence detection based only on the arteriovenous anastomosis 22. You may come to do it. Further, the authentication control unit 5 may identify an individual based on the position of the arteriovenous anastomosis 22 and detect the presence or absence of a biological reaction based on the presence or absence of expansion or contraction of the vein pattern 21.

  -In the said embodiment, when the authentication control part 5 judges that the vein pattern 21 of the imaged finger 6 and the vein pattern 21 of the registrant recorded in the memory 5a match or approximate, that is, an individual is specified. Only when the temperature control mechanism 14 is activated, the operation control of the temperature adjustment mechanism 14 and the determination of the presence or absence of a biological reaction based on the presence or absence of expansion or contraction of the arteriovenous anastomosis 22 are performed. However, the authentication control unit 5 performs the operation control of the temperature adjustment mechanism 14 and the determination of the presence or absence of a biological reaction based on the presence or absence of expansion or contraction of the arteriovenous anastomosis 22 regardless of whether or not the vein patterns 21 match. It may be.

  The temperature adjustment mechanism 14 may have a configuration having only one of a heating function and a cooling function. However, in this case, it is preferable that the image input device 4 is disposed at a place where the ambient temperature is kept substantially constant. Specifically, in the image input device 4 provided with the temperature adjustment mechanism 14 having only the heating function, it is preferable that the image input device 4 is disposed at a location where the ambient temperature is kept low. On the other hand, in the image input device 4 provided with the temperature adjustment mechanism 14 having only a cooling function, it is preferable that the image input device 4 is disposed at a location where the ambient temperature is kept high.

  The acquisition target part is not limited to the finger 6 and may be any part of the body such as the entire palm or toes. However, when the arteriovenous anastomosis 22 is used to detect a biological reaction, it is preferably the end portion of the body.

  The security device 3 is not limited to permitting / prohibiting passage of the entrance / exit control gate, but for example, a security system such as permitting / prohibiting activation of a personal computer or permitting / prohibiting start of a vehicle engine Generally applicable. That is, the personal authentication device 2 is not limited to the entrance / exit management system 1 and may be used in general security systems.

The camera 12 is not limited to the near-infrared camera, and may be configured by any camera as long as the vein pattern 21 and the arteriovenous anastomosis 22 can be imaged.
The personal authentication device 2 may be provided with notification means including a buzzer and a display. When the authentication control unit 5 determines that there is a possibility that the authenticated finger 6 is a fake finger, that is, the collation of the vein pattern 21 matches or approximates, but the arteriovenous anastomosis 22 expands or contracts. When it cannot detect, you may make it alert | report to the circumference | surroundings by operating this alerting | reporting means. In addition, as a mode of notification by the authentication control unit 5, an immediate notification mode for immediately reporting when a fraudulent authentication act with a forged finger is performed, or that the fraud authentication activity is performed is temporarily recorded in the memory 5 a. There is a delay notification mode in which, when authentication by a registrant (user) is established, a fraud authentication act is performed with the time. In this way, it is possible to threaten a third party who has performed fraud authentication. In addition, since the user can be prompted to change the registration finger, the user deletes the registration data used for fraud authentication, and newly records the registration data in the memory 5 a with another finger 6. It is possible to suppress the fraud authentication by the forged finger from being performed again. Therefore, security can be enhanced.

Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.
(1) In the personal authentication apparatus, the authentication unit, when the ambient temperature is lower than the higher the hot threshold than the low temperature threshold, the vessel of the acquisition target portion imaged in a state of being cooled by the temperature control unit The presence or absence of expansion or contraction of a blood vessel is detected by comparing the image with a blood vessel image of the acquisition target portion imaged in a state heated by the temperature adjusting means. According to the technical idea described in (1), since the degree of expansion or contraction of the blood vessel is increased, it is possible to more reliably detect the presence or absence of the expansion or contraction.

(2) In the personal authentication apparatus, the authentication means, on condition that the blood vessel image of the registration data recorded in the recording means and the obtained blood vessel image by the blood vessel image acquiring unit matches or approximates, the Performing temperature adjustment of the acquisition target part by a temperature adjustment unit, and detecting whether or not the blood vessel of the acquisition target part is expanded or contracted based on a temperature change by the temperature adjustment unit. According to the technical idea described in (2), wasteful power consumption can be suppressed.

(3) In the personal authentication apparatus, the acquisition target portion, it is finger of the person to be authenticated.

The schematic diagram which shows roughly the structure of the entrance / exit management system of one Embodiment of this invention. The block diagram which shows schematic structure of the embodiment. The figure which shows a vein pattern typically. (A), (b) is a figure which shows an arteriovenous anastomosis typically. 6 is an exemplary flowchart illustrating authentication processing performed by the authentication unit according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Entrance / exit management system, 2 ... Personal authentication apparatus, 3 ... Security apparatus, 5 ... Authentication control part as authentication means, 5a ... Memory as recording means, 6 ... Finger as acquisition object part, 11 ... Main body of apparatus, DESCRIPTION OF SYMBOLS 12 ... Camera as blood-vessel image acquisition means, 14 ... Temperature adjustment mechanism as temperature adjustment means, 21 ... Vein pattern, 22 ... Arteriovenous anastomosis.

Claims (5)

Blood vessel image acquisition means for acquiring a blood vessel image of the acquisition target part by imaging one part of the body of the authentication target person as the acquisition target part;
A recording means for recording a blood vessel image of the acquisition target part in a registrant as registration data;
Temperature adjusting means for adjusting the temperature of the acquisition target part;
An apparatus main body in which the blood vessel image acquisition means and the temperature adjustment means are disposed;
The blood vessel image acquired by the blood vessel image acquisition unit coincides with or approximates the blood vessel image of the registered data recorded in the recording unit, and the blood vessel expansion or contraction of the acquisition target portion is caused by a temperature change by the temperature adjustment unit. A personal authentication apparatus comprising: an authentication unit that determines that authentication is established on the condition that the blood vessel image acquired by the blood vessel image acquisition unit is detected by comparing blood vessel images before and after the temperature change . The temperature adjusting means has a function of cooling and heating the acquisition target part,
The authentication means includes
When the temperature of the acquisition target portion is higher than a preset high temperature threshold, the blood vessel image of the acquisition target portion taken in a state where the temperature adjustment by the temperature adjustment means is not performed, and the temperature adjustment means While detecting the presence or absence of blood vessel expansion or contraction by comparing with the blood vessel image of the acquisition target portion imaged in the state,
When the temperature of the acquisition target part is lower than a preset low temperature threshold, the blood vessel image of the acquisition target part captured in a state where the temperature adjustment by the temperature adjustment means is not performed, and the temperature adjustment means heated The personal authentication device according to claim 1, wherein presence / absence of expansion or contraction of a blood vessel is detected by comparing with a blood vessel image of the acquisition target portion captured in a state. The blood vessel image is a vein pattern and an arteriovenous anastomosis of the acquisition target part,
The authentication means, together with the obtained vein pattern matches or approximates the vein pattern of the registered data by the blood vessel image acquiring means, wherein the expansion or contraction of the arteriovenous anastomoses by temperature change due to the temperature adjusting means blood vessel image The personal authentication device according to claim 1 or 2, wherein the authentication is determined to be established on the condition that the detection is made by comparing the blood vessel images before and after the temperature change acquired by the acquisition means . The blood vessel image is an arteriovenous anastomosis of the acquisition target part,
The authenticating unit matches or approximates the position of the arteriovenous anastomosis acquired by the blood vessel image acquiring unit and the position of the arteriovenous anastomosis of the registration data, and the arteriovenous anastomosis is performed by a temperature change by the temperature adjusting unit. The authentication is determined to be established on the condition that the expansion or contraction is detected by comparing the blood vessel images before and after the temperature change acquired by the blood vessel image acquisition means. Personal authentication device.   By capturing one part of the body of the person to be authenticated as an acquisition target part, a blood vessel image of the acquisition target part is acquired by the blood vessel image acquisition means,
  Determining whether the blood vessel image acquired by the blood vessel image acquisition means and the blood vessel image of the registration data recorded in the recording means match or approximate,
  When both blood vessel images match or approximate in the determination, the temperature adjustment unit performs temperature adjustment of the acquisition target part,
  Detecting the presence or absence of expansion or contraction of the blood vessel of the acquisition target part by a temperature change by the temperature adjustment means by comparing the blood vessel images before and after the temperature change acquired by the blood vessel image acquisition means;
  A personal authentication method characterized in that the authentication means determines that authentication has been established on the condition that blood vessel expansion or contraction has been detected.

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