Gate control system

Abstract

This system provides a gate control system that prevents unauthorized individuals from entering through security gates by tailgating. [Solution] The gate control system according to the present invention is a gate control system that controls the opening and closing of a restricting means of a security gate, comprising: a first authentication means for authenticating a plurality of persons present in a first area; a second authentication means for authenticating a person who has moved to a second area closer to the security gate than the first area; and a control means for controlling the opening of the restricting means when the second authentication by the second authentication means is successful, wherein the control means performs tailgating prevention control during the second authentication, depending on whether or not there is a person among the plurality of persons for whom the first authentication by the first authentication means was unsuccessful.

Description

Technical Field

[0001] The present invention relates to a gate control system.

Background Art

[0002] Conventionally, a gate control system for controlling a security gate has been known. For example, Patent Document 1 discloses a gate management system that authenticates a person based on a face image of the person included in a video captured by a camera that captures an area near the gate, and unlocks the gate when the person is a registered person.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a gate management system, there is a possibility that a so-called piggyback situation occurs where a person without the right to pass through a security gate approaches and moves with a person having the right to pass through the security gate, and then passes through the security gate. In a gate control system, it is desired to suppress the occurrence of piggybacking.

[0005] An object of the present invention is to provide a gate control system capable of appropriately suppressing the occurrence of piggybacking.

Means for Solving the Problems

[0006] The gate control system according to the present invention is a gate control system that controls the opening and closing of a restricting means of a security gate, comprising: a first authentication means for authenticating a plurality of persons present in a first area; a second authentication means for authenticating a person who has moved to a second area closer to the security gate than the first area; and a control means for controlling the opening of the restricting means when the second authentication by the second authentication means is successful, wherein the control means performs tailgating prevention control during the second authentication, depending on whether or not there is a person among the plurality of persons for whom the first authentication by the first authentication means was unsuccessful.

[0007] Furthermore, in the gate control system according to the present invention, it is preferable that the first authentication is an authentication method that can authenticate at a first distance from the imaging unit, and that authentication is performed using the gait characteristics of a person included in the image acquired by the imaging unit or using the appearance characteristics of a person, and the second authentication is an authentication method that can authenticate at a second distance shorter than the first distance.

[0008] Furthermore, in the gate control system according to the present invention, the first authentication method is an authentication method that does not require an authentication action by the user, and preferably uses the characteristics of a person's gait included in the image acquired by the imaging unit or uses the characteristics of a person's appearance, while the second authentication method is an authentication method that requires an authentication action by the user, and preferably uses static biometric information or an authentication medium.

[0009] Furthermore, in the gate control system according to the present invention, the first authentication is an authentication method with lower authentication accuracy than the second authentication, and it is preferable that the authentication threshold is set so that the false acceptance rate in the first authentication is below a predetermined level, and that authentication is performed using the gait characteristics of a person included in the image acquired by the imaging unit or using the appearance characteristics of a person.

[0010] Furthermore, the gate control system according to the present invention further comprises a notification unit that outputs guidance information or warning information, and it is preferable that the control means controls the notification unit to output guidance information or warning information during the second authentication, depending on whether or not there is a person among the multiple persons who failed the first authentication.

[0011] Furthermore, in the gate control system according to the present invention, it is preferable that the control means controls the notification unit so that, if there is a person among the multiple persons who failed the first authentication, it outputs warning information to the person among the multiple persons who succeeded in the first authentication and is closest to the person who failed the first authentication, and outputs guidance information to the other persons who succeeded in the first authentication.

[0012] Furthermore, in the gate control system according to the present invention, it is preferable that the control means controls the opening and closing of the restricting means depending on whether or not there is a person among the multiple persons who failed the first authentication.

[0013] Furthermore, in the gate control system according to the present invention, when there are individuals among the group of individuals who failed the first authentication, it is preferable that the control means shorten the time for which the restrictive means is opened for individuals who succeeded in the second authentication compared to when there are no individuals among the group of individuals who failed the first authentication. [Effects of the Invention]

[0014] According to the present invention, the gate control system can appropriately suppress the occurrence of tailgating. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic diagram illustrating the gate control system 1 according to Embodiment 1. [Figure 2] This is a functional block diagram of the gate control system 1 according to Embodiment 1. [Figure 3] This figure shows an example of the data structure of user table 141. [Figure 4] This is a flowchart showing the flow of gate control processing performed by gate control system 1. [Modes for carrying out the invention]

[0016] The gate control system according to the present invention will be described below with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to those embodiments, but extends to the invention described in the claims and its equivalents.

[0017] (Embodiment 1) Figure 1 is a schematic diagram illustrating a gate control system 1 according to Embodiment 1. The gate control system 1 controls the opening and closing of the door G of a security gate 20 installed in a facility such as a company, apartment building, lodging facility, commercial facility, or train station. Door G is an example of a restrictive means. Users of the security gate 20 pass through a first area E1 and proceed to a second area E2. The first area E1 is, for example, a passage leading to the security gate 20. The second area E2 is, for example, an authentication area where authentication is received to pass through the security gate 20. The second area E2 is closer to the security gate than the first area E1. Note that the first area E1 and the second area E2 may overlap in some areas, or the first area E1 may encompass the second area E2. The gate control system 1 performs first authentication when persons P1 to P3 are present in the first area E1, and performs second authentication for person P1 who has moved to the second area. If there are persons who failed first authentication during second authentication, the gate control system 1 performs tailgating prevention control, which will be described later.

[0018] The first authentication is an authentication method that can be performed at a first distance from the camera C. The camera C is an example of an imaging unit. The first authentication is, for example, gait authentication. Gait authentication is an authentication method for authenticating a user based on their gait. Gait is an individual's dynamic attribute that includes characteristics of an individual's walking, such as stride length and walking speed when walking, as well as the way of moving hands and feet (e.g., the angle and amplitude of swinging hands, the rhythm of foot movements). Note that the first authentication does not need to require the user to perform an action for authentication, such as an action of facing the camera or holding a card in front of it. Any authentication method that can perform authentication during the user's walking for entering the facility is acceptable. For example, it may be a walk-through type face authentication or an authentication using features of appearance (e.g., height, body type, clothing, belongings, etc.). In other words, the first authentication only needs to be an authentication method that does not require the user to perform an authentication action. Also, the first authentication only needs to perform authentication using the characteristics of the user's gait or appearance features included in the image acquired by the camera C. The first authentication may be an authentication method with a lower authentication accuracy than the second authentication.

[0019] The second authentication is an authentication method that can be performed at a second distance shorter than the first distance, and for example, it is card authentication. Card authentication is an authentication method for authenticating a user based on the authentication information recorded on the card. The card is, for example, an IC card and is given to each user of the security gate 20. Note that the second authentication only needs to be an authentication method that requires the user to operate an authentication medium such as an IC card or a two-dimensional code, or an authentication method that requires the user to perform an action for reading biometric information such as face authentication or fingerprint authentication. For example, it may be authentication using a two-dimensional code such as a QR code (registered trademark), or biometric authentication using static biometric information such as face authentication, iris authentication, fingerprint authentication, or vein authentication. In other words, the second authentication only needs to be an authentication method that requires the user to perform an authentication action. Also, the second authentication only needs to be authentication using static biometric information or an authentication medium.

[0020] FIG. 2 is a functional block diagram of the gate control system 1 according to Embodiment 1. The gate control system 1 includes a gate management server 10, a security gate 20, a camera C, and the like. The gate management server 10, the security gate 20, and the camera C are communicably connected to each other via a communication network N.

[0021] The gate management server 10 is arranged in a management center or the like and controls or manages the security gate 20. The gate management server 10 includes a first operation unit 11, a first display unit 12, a first communication unit 13, a first storage unit 14, a first processing unit 15, and the like.

[0022] The first operation unit 11 includes an input device such as a touch panel or a keyboard and an interface circuit that acquires signals from the input device, receives operations by a user, and outputs a signal corresponding to the received operation to the first processing unit 15.

[0023] The first display unit 12 includes a display including a liquid crystal, an organic EL (Electro Luminescence), or the like, and an interface circuit that outputs image data to the display, and displays each piece of information such as an image and text according to an instruction from the first processing unit 15.

[0024] The first communication unit 13 has a communication interface circuit compliant with, for example, TCP / IP or the like, and is connected to the communication network N. Alternatively, the first communication unit 13 has, for example, an antenna that transmits and receives radio signals and a radio communication interface circuit for transmitting and receiving signals through a radio communication line according to a radio communication protocol such as a wireless LAN, and is connected to the communication network N via an access point. The first communication unit 13 outputs data received from the communication network N to the first processing unit 15, and transmits data input from the first processing unit 15 to the communication network N.

[0025] The first storage unit 14 includes semiconductor memory such as ROM and RAM, a magnetic disk or optical disk drive such as CD-ROM or DVD-ROM, and its recording medium. The first storage unit 14 stores computer programs and various data for controlling the gate management server 10, and inputs and outputs this information to and from the first processing unit 15. The computer program may be installed in the first storage unit 14 from a computer-readable portable recording medium such as a CD-ROM or DVD-ROM using a known setup program or the like. The computer program may also be stored on a recording medium owned by a predetermined server and installed via a network. The first storage unit 14 stores data such as a user table 141. The user table 141 shows the authentication information of users who have been authorized by the administrator of the gate control system 1 to pass through the security gate 20. Details of the user table 141 will be described later.

[0026] The first processing unit 15 includes a processor such as a CPU or MPU, memory such as ROM or RAM, and peripheral circuits, and executes various processes of the gate management server 10. A DSP, LSI, ASIC, FPGA, etc., may be used as the first processing unit 15.

[0027] The first processing unit 15 includes, as functional blocks, a determination means 151, a first authentication means 152, a second authentication means 153, and a control means 154 that controls the opening of the door G when the second authentication by the second authentication means 153 is successful. These functional blocks are functional modules realized based on a program executed by the first processing unit 15. These functional blocks may also be firmware implemented in the gate management server 10.

[0028] The security gate 20 is a flap-type gate, swing-type gate, sliding-type gate, shutter-type gate, etc. The security gate 20 acquires the user's authentication information (user ID stored on the ID card) and transmits the acquired authentication information to the gate management server 10. The security gate 20 controls the opening and closing of the door G according to the signal received from the gate management server 10. The security gate 20 is placed at the boundary between a low-security area with low security requirements and a high-security area with high security requirements. The security gate 20 may also be applied to automatic doors of elevators and other doors, ticket gates at train stations, etc.

[0029] The security gate 20 includes a detection unit 21, a reading unit 22, a sensor 23, a door drive unit 24, an audio output unit 25, a second display unit 26, a second communication unit 27, a second storage unit 28, and a second processing unit 29, among others.

[0030] The detection unit 21 detects a person moving into the second area E2. The detection unit 21 is, for example, an infrared sensor that detects an object (person) in the second area E2 based on a change in the amount of infrared light received. The detection unit 21 may also be an image sensor that detects an object in the second area E2 based on a difference signal between the captured image and a pre-stored background image. When a person is detected in the second area E2, the detection unit 21 transmits a detection signal to the gate management server 10.

[0031] The reading unit 22 is installed at the entrance of the security gate 20, etc. The reading unit 22 is, for example, a card reader, which reads the user ID stored in the IC card held by the user to identify the user and outputs it to the second processing unit 29. The card reader is, for example, a contactless card reader / writer.

[0032] Furthermore, if the second authentication is biometric authentication such as facial recognition, iris recognition, or fingerprint recognition, the reading unit 22 may be a camera for reading the user's biometric information such as face, iris, or fingerprints. The camera has, for example, a photoelectric conversion element sensitive to visible light or infrared light, such as a CCD element or C-MOS element, an imaging optical system that forms an image on the photoelectric conversion element, and an A / D converter, and generates an image of the user's face, iris, fingerprints, etc., and outputs it to the second processing unit 29.

[0033] Sensor 23 is a sensor for detecting a person passing through the security gate 20. Sensor 23 includes one or more laser sensors installed on the front, inner side, top surface, etc., of the security gate 20. Each laser sensor measures the distance to an object present around the security gate 20 based on the time from when the irradiator emits light until the receiver receives the reflected light. Sensor 23 outputs a detection signal to the second processing unit 29 at a predetermined interval, which includes multiple combinations of the direction in which each laser sensor emitted light and the measured distance. Sensor 23 may also include a camera installed on the front, inner side, top surface, etc., of the security gate 20, and may output a visible light image or a thermal image to the second processing unit 29.

[0034] The door drive unit 24 includes a motor for opening and closing the door G. The door drive unit 24 receives a door drive signal from the second processing unit 29, rotates according to the received door drive signal to generate driving force, and opens and closes the door G. If the security gate 20 is a flap-type gate or a swing-type gate, the door drive unit 24 rotates the door G, and if the security gate 20 is a sliding-type gate or a shutter-type gate, the door drive unit 24 slides the door G.

[0035] The audio output unit 25 is configured to output sound and includes a speaker. The audio output unit 25 outputs sound based on a signal supplied from the second processing unit 29. The audio output unit 25 is an example of a notification unit that outputs guidance information or warning information.

[0036] The second display unit 26 is configured to display images and includes a display such as a liquid crystal display or an organic EL display. The second display unit 26 generates and displays images based on signals supplied from the second processing unit 29. The second display unit 26 is an example of a notification unit that outputs guidance information or warning information.

[0037] The second communication unit 27 has a communication interface circuit compliant with, for example, TCP / IP, and is connected to the communication network N. Alternatively, the second communication unit 27 has, for example, an antenna for transmitting and receiving wireless signals, and a wireless communication interface circuit for transmitting and receiving signals via a wireless communication line in accordance with a wireless communication protocol such as a wireless LAN, and is connected to the communication network N via an access point. The second communication unit 27 outputs data received from the communication network N to the second processing unit 29 and transmits data input from the second processing unit 29 to the communication network N.

[0038] The second storage unit 28 includes semiconductor memory such as ROM and RAM, a magnetic disk or optical disk drive such as a CD-ROM or DVD-ROM, and its recording medium. The second storage unit 28 stores a computer program and various data for controlling the security gate 20, and inputs and outputs this information to and from the second processing unit 29. The computer program may be installed in the second storage unit 28 from a computer-readable portable recording medium such as a CD-ROM or DVD-ROM using a known setup program or the like. The computer program may also be stored on a recording medium owned by a predetermined server and installed via a network.

[0039] The second processing unit 29 includes a processor such as a CPU or MPU, memory such as ROM or RAM, and peripheral circuits, and performs various signal processing for the security gate 20. A DSP, LSI, ASIC, FPGA, etc., may be used as the second processing unit 29.

[0040] The second processing unit 29 transmits the user authentication information obtained from the reading unit 22 to the gate management server 10 via the second communication unit 27, and controls the door drive unit 24 to open and close the security gate 20 according to the signal received from the gate management server 10. When the door G is opened, the second processing unit 29 transmits an open notification signal to the gate management server 10 via the second communication unit to notify that the security gate 20 has opened, and when the door G is closed, it transmits a closed notification signal to the gate management server 10 to notify that the security gate 20 has closed.

[0041] Camera C is positioned to capture images within the first region E1, captures images of the first region E1 to generate images, and outputs the images to the gate management server 10 via the communication network N.

[0042] Figure 3 shows an example of the data structure of the user table 141. In the user table 141, user ID, user gait information, etc., are set up in relation to each user who is permitted to pass through the security gate 20.

[0043] The user ID is information that uniquely identifies a user. User gait information is information about the user's gait.

[0044] Figure 4 is a flowchart showing the flow of gate control processing performed by the gate control system 1. The flowchart shown in Figure 4 is executed mainly by the first processing unit 15 in cooperation with each element of the gate control system 1, based on a program pre-stored in the first storage unit 14.

[0045] First, the first authentication means 152 determines whether or not first authentication is possible (step S101). The first authentication means 152 determines whether or not first authentication is possible based on whether or not a person has been detected in the first region E1, for example, based on the image captured by the camera C. In other words, the first authentication means 152 determines whether or not first authentication is possible based on whether or not a person has been detected within the imaging range of the camera C. The first authentication means 152 detects a person from the image captured by the camera C using object detection technology such as YOLO (You Only Look Once) or SSD (Single Shot Multibox Detector).

[0046] Furthermore, the gate control system 1 may be equipped with other arbitrary object detection sensors, such as infrared sensors, near the first region E1, and the first authentication means 152 may determine whether or not first authentication is possible by detecting an object (person) within the first region E1 based on changes in the amount of infrared light received.

[0047] If first authentication is possible (S101-YES), the first authentication means 152 performs first authentication (step S102). The first authentication means 152 authenticates the person present in the first area E1. The first authentication means 152 compares the gait information stored in the user table 141 with the gait information extracted from the image of the detected person to determine whether the detected person is a user or not. The process in step S102 is performed as needed, and the authentication result of the most recent first authentication is used in the determination in step S112 described later.

[0048] The first authentication means 152 extracts gait information of a person from an image using known gait recognition technology. For example, the first authentication means 152 performs preprocessing on the acquired image by removing the background portion using background subtraction or the like. The first authentication means 152 detects a person from the preprocessed image using object detection technology such as YOLO or SSD. For each frame of the image captured by camera C, the first authentication means 152 obtains the bounding box (the area surrounding the person with a rectangle) of the detected person. The first authentication means 152 tracks a specific person by associating bounding boxes that depict the same person with each other using known tracking processes such as Kalman filter or Mean-Shift. For example, the first authentication means 152 calculates the distance between the centroid position of the bounding box extracted from the current frame and the centroid position of the bounding box extracted from the previous frame, and if that distance is below a threshold, it associates the person depicted in that bounding box with the same person.

[0049] The first authentication means 152 estimates the skeleton of the person being tracked using a skeleton estimation technique such as OpenPose or HRNet. The first authentication means 152 extracts gait characteristics from the data obtained by the skeleton estimation. Specifically, the first authentication means 152 tracks how the position and angle of the joints change while the person is walking to recognize the rhythm and pattern of walking, and extracts gait characteristics necessary for gait authentication (e.g., stride length, foot angle, foot rhythm, body sway, etc.) as numerical values.

[0050] The first authentication means 152 compares the extracted gait information with the user gait information to determine whether the detected person is the user. For example, the first authentication means 152 generates feature vectors that numerically represent the gait for both the extracted gait information and the user gait information. The first authentication means 152 calculates the Euclidean distance between the two feature vectors (the square root of the sum of the squares of the differences between each corresponding element of the two feature vectors). The smaller the calculated Euclidean distance, the higher the degree of agreement between the two sets of gait information. The first authentication means 152 calculates the reciprocal of the calculated Euclidean distance as a similarity score. That is, the higher the similarity score, the higher the degree of agreement between the two sets of gait information.

[0051] The first authentication means 152 compares the calculated similarity score with a pre-set first threshold. The first threshold is determined, for example, by having the user to be registered take the authentication test multiple times, as well as by having other people take the authentication test multiple times, and adjusting the predetermined similarity score so that the false acceptance ratio (FAR) and the false rejection ratio (FRR) are equal. The predetermined similarity score is determined, for example, by preparing multiple gait information of the user to be registered (e.g., gait information based on walking without carrying anything, gait information based on walking with belongings, etc.) and gait information of multiple people other than the user to be registered, calculating the similarity score for each of the other gait information based on the gait information of the user to be registered based on walking without carrying anything, and determining the score based on the multiple similarity scores calculated.

[0052] Furthermore, when calculating the first threshold, priority may be given to suppressing the misidentification of a person who is not a user as a user. That is, the first threshold may be set so that the false rejection rate is higher than the false acceptance rate. For example, the first threshold may be set so that the false acceptance rate in the first authentication is below a predetermined level (e.g., 1% or less). In this case, the first threshold is an example of an authentication threshold. This makes it possible for the gate control system 1 to suppress the misidentification of a person who is not a legitimate user as a legitimate user in the first authentication.

[0053] The first authentication means 152 determines that the gaits match, i.e., the first authentication is successful, if the similarity score is equal to or greater than the first threshold. The first authentication means 152 determines that the gaits do not match, i.e., the first authentication was unsuccessful, if the similarity score is less than the first threshold.

[0054] The method for calculating the similarity score is just one example, and the first authentication means 152 may, for example, calculate the similarity score using Dynamic Time Warping (DTW), a method that calculates the similarity between two time series data as a distance.

[0055] If first authentication is not possible (S101-NO) or if first authentication has been performed, the second authentication means 153 determines whether second authentication is possible (step S103). The second authentication means 153 determines whether second authentication is possible, for example, by whether the detection unit 21 has detected a person in the second area E2. The second authentication means 153 may also determine that second authentication is possible when the reading unit 22 has read the IC card. Alternatively, if the reading unit 22 is a camera, the second authentication means 153 may determine that second authentication is possible when the reading unit 22 has captured an image of the user's face, iris, fingerprints, etc. In this case, the detection unit 21 may be omitted.

[0056] If the second authentication is not possible (S103-NO), the gate control process returns to the process of S101, and the first authentication means 152 determines again whether the first authentication is possible or not.

[0057] If a second authentication is possible (S103-YES), the determination means 151 determines during the processing of step S102 whether or not a person who failed the first authentication is present in the first area E1 (step S104).

[0058] If there is a person for whom the first authentication was unsuccessful (S104-YES), the determination means 151 determines whether the person detected in step S103 is the person closest to the person for whom the first authentication was unsuccessful during the process of step S102 (step S105).

[0059] The determination means 151 calculates the distance (Euclidean distance) between the centroid positions of the bounding boxes of each person in the frame immediately before one of the multiple people P1 to P3 being tracked in step S102 moves outside the imaging range on the second region E2 side of camera C. The determination means 151 identifies the distance relationships between the people (for example, the distance between person P1 and person P2, the distance between person P2 and person P3, etc.) immediately before one of the multiple people P1 to P3 moves outside the imaging range on the second region E2 side of camera C. The determination means 151 estimates that the person who first moved outside the imaging range on the second region E2 side of camera C among the multiple people P1 to P3 is the person detected in step S103.

[0060] The determination means 151 determines whether the detected person is the person closest to the person for whom the first authentication failed, based on the authentication result of the first authentication in step S102, the estimated person, and the distance relationship between the identified person. For example, if person P1 is the person estimated to be detected during the processing of step S103, person P3 is the person for whom the first authentication failed, and person P2 is identified as the person closest to person P3 based on the distance relationship between the people, the determination means 151 determines that the detected person is not the person closest to the person for whom the first authentication failed.

[0061] Furthermore, the determination means 151 preferably considers, in addition to determining whether the detected person is the person closest to the person who failed the first authentication, whether the detected person is moving in front of the person who failed the first authentication. Also, if, during the processing of step S102, the person who failed the first authentication and the person closest to that person are separated by a predetermined distance or more, for example, if the Euclidean distance between the center of gravity of the bounding box of the person who failed the first authentication and the center of gravity of the bounding box of the person closest to that person is greater than or equal to a predetermined second threshold, the determination means 151 may determine that the detected person is not the person closest to the person who failed the first authentication.

[0062] Furthermore, if the detection unit 21 is an image sensor, the determination means 151 may track a specific person by associating each pixel in the image captured by the camera C with each pixel in the image captured by the detection unit 21.

[0063] If the person detected during step S103 is the person closest to the person who failed first authentication during step S102 (S105-YES), the control means 154 controls the voice output unit 25 and / or the second display unit 26 to issue a first notification to the person detected during step S103 (step S106). The first notification is a warning notification to prevent tailgating, such as "Please pass with space between you" or "Only one person may enter the authentication area." In other words, as a tailgating prevention control, the control means 154 controls the voice output unit 25 and / or the second display unit 26 to issue a warning to the person among the multiple people who succeeded in first authentication and is closest to the person who failed first authentication.

[0064] If the person detected during step S103 is not the person closest to the person who failed first authentication during step S102 (S105-NO), or if there is no person who failed first authentication during step S102 (S104-NO), the control means 154 controls the voice output unit 25 and / or the second display unit 26 to issue a second notification to the person detected during step S103 (step S107). The second notification is an informational notification prompting second authentication, such as "Please hold your card over the gate." In other words, as a tailgating prevention control, the control means 154 controls the voice output unit 25 and / or the second display unit 26 to output informational or warning information during second authentication, depending on whether there is a person among the multiple people who failed first authentication. Informational information is, for example, an informational notification, and warning information is, for example, a warning notification. Furthermore, as a countermeasure against tailgating, the control means 154 controls the voice output unit 25 and / or the second display unit 26 to output warning information to the person who succeeded in the first authentication among the group of people and is closest to the person who failed the first authentication, and to output guidance information to the other people who succeeded in the first authentication.

[0065] Next, the determination means 151 determines whether the door G of the security gate 20 is open or closed (step S108). The determination means 151 determines whether or not it has received an open notification signal and a closed notification signal via the first communication unit 13. If the determination means 151 has received an open notification signal but has not received a closed notification signal, it determines that the door G is open; otherwise, it determines that the door G is closed.

[0066] If door G is open (S108-YES), the determination means 151 determines whether or not there is a person in the first area E1 who failed the first authentication during the processing of step S102 (step S109). Using the processing result of step S104, the determination means 151 determines whether or not there is a person among the multiple persons P1 to P3 who failed the first authentication by the first authentication means 152 at the time of processing of step S102.

[0067] If there is a person who failed the first authentication (S109-YES), the control means 154 closes the door G (step S110). That is, as a tailgating prevention control, the control means 154 controls the opening and closing of the door depending on whether there is a person among the multiple persons P1 to P3 who failed the first authentication. The control means 154 transmits a close control signal to the security gate 20 via the first communication unit 13 to close the security gate 20. The second processing unit 29 of the security gate 20 receives the close control signal from the gate management server 10 via the second communication unit 27, and drives the door drive unit 24 according to the received close control signal to close the security gate 20. The second processing unit 29 transmits a close notification signal to the gate management server 10 via the second communication unit 27.

[0068] If door G is closed (S108-NO), if there are no persons who failed the first authentication (S109-NO), or if door G is closed in step S110, the second authentication means 153 performs the second authentication (step S111). That is, as a tailgating prevention control, the control means 154 closes door G each time the second authentication is performed if there are persons among the multiple persons P1 to P3 who failed the first authentication, and allows the second authentication to be performed continuously with door G remaining open if there are no persons among the multiple persons P1 to P3 who failed the first authentication.

[0069] The second authentication means 153 authenticates person P1 who has moved to the second area E2. The second processing unit 29 transmits the user ID (authentication information) read by the reading unit 22 to the gate management server 10 via the second communication unit 27. The second authentication means 153 compares the user ID received via the first communication unit 13 with the user ID registered in the first storage unit 14. The second authentication means 153 determines whether the second authentication was successful based on whether the user ID read by the reading unit 22 matches any of the user IDs registered in the user table 141.

[0070] If the second authentication fails, the control means 154 closes the door. The control means 154 transmits a close control signal to the security gate 20 via the first communication unit 13. The second processing unit 29 receives the close control signal from the gate management server 10 via the second communication unit 27 and drives the door drive unit 24 according to the received close control signal, closing the security gate 20. The second processing unit 29 transmits a close notification signal to the gate management server 10 via the second communication unit 27.

[0071] If the second authentication is successful, the determination means 151 determines whether or not there is a person in the first area E1 who failed the first authentication during the processing of the most recent first authentication (step S112). Using the processing result of the most recent first authentication, the determination means 151 determines whether or not there is a person among the multiple persons P1 to P3 who failed the first authentication by the first authentication means 152 during the processing of step S111.

[0072] If there is a person for whom the first authentication failed (S112-YES), the control means 154 opens the door G for a first predetermined time (step S113). The control means 154 transmits an open control signal to the security gate 20 via the first communication unit 13 to open the security gate 20. The second processing unit 29 receives the open control signal from the gate management server 10 via the second communication unit 27 and drives the door drive unit 24 according to the received open control signal to open the security gate 20. The second processing unit 29 transmits an open notification signal to the gate management server 10 via the second communication unit 27. The first predetermined time is, for example, 3 seconds. When the first predetermined time has elapsed, the control means 154 closes the door G. The control means 154 transmits a close control signal to the security gate 20 via the first communication unit 13. The second processing unit 29 receives a close control signal from the gate management server 10 via the second communication unit 27, and drives the door drive unit 24 according to the received close control signal to close the security gate 20. The second processing unit 29 transmits a close notification signal to the gate management server 10 via the second communication unit 27.

[0073] If there are no individuals who failed the first authentication (S112-NO), the control means 154 opens the door G for a second predetermined time (step S114). The control means 154 opens the door G in the same manner as in step S113, and closes the door G after the second predetermined time has elapsed. The second predetermined time is longer than the first predetermined time, for example, 6 seconds. That is, as a tailgating prevention control, the control means 154 shortens the time the door G is open for individuals who succeeded in the second authentication compared to when there are individuals among the multiple individuals P1 to P3 who failed the first authentication, compared to when there are no individuals among the multiple individuals P1 to P3 who failed the first authentication. This completes the gate control process.

[0074] Furthermore, the processes from steps S104 to S107 may be omitted, and the control means 154 may not issue a notification. Also, the process in step S105 may be omitted, and the control means 154 may control the audio output unit 25 and / or the second display unit 26 to always issue a first notification if there is a person among the multiple persons who failed the first authentication. Also, the process in step S107 may be omitted, and the control means 154 may control the audio output unit 25 and / or the second display unit 26 not to issue a notification if there is no person among the multiple persons who failed the first authentication.

[0075] Furthermore, the process in step S109 may be omitted, and the control means 154 may close the door regardless of whether or not there is a person for whom the first authentication was unsuccessful.

[0076] Alternatively, the processes from steps S112 to S114 may be omitted, and the control means 154 may control the door so that the door opening time is uniform regardless of whether or not there is a person who failed the first authentication. Or, the control means 154 may control the door G based on whether or not there is a person passing through the security gate 20. In that case, the second processing unit 29 acquires a detection signal, a visible light image or a thermal image from the sensor 23, and determines whether or not there is a person passing through the security gate 20 based on the acquired detection signal, a visible light image or a thermal image. After opening the door, the second processing unit 29 drives the door drive unit 24 to close the door G if it determines that there is no person passing through the security gate 20.

[0077] As explained above, the gate control system 1 performs tailgating prevention control depending on whether or not there is a person who failed the first authentication in the first area E1 away from the security gate 20. A person who failed the first authentication is not a registered user and may enter the security gate 20 by tailgating. By performing tailgating prevention control depending on whether or not there is a person who failed the first authentication, the gate control system 1 makes it possible to appropriately suppress the occurrence of tailgating.

[0078] Preferably, the first authentication is gait recognition. Although the accuracy of gait recognition may be lower than that of facial recognition, etc., it can authenticate from a distance and can authenticate even in images where facial features are not visible. The gate control system 1 performs gait recognition, which can authenticate from a distance, before the second authentication is performed, and executes tailgating prevention control. This allows the gate control system 1 to execute tailgating prevention control before a legitimate user performs the second authentication, which could be performed by tailgating.

[0079] Preferably, the control means 154 controls the voice output unit 25 and / or the second display unit 26 to change the notification content depending on whether or not there is a person among the multiple persons P1 to P3 who failed the first authentication. This enables the gate control system 1 to provide notifications depending on whether or not there is a person attempting to enter by tailgating.

[0080] Preferably, if there is a person among the multiple persons P1 to P3 who failed the first authentication, the control means 154 controls the voice output unit 25 and / or the second display unit 26 to issue a warning to the person among the multiple persons P1 to P3 who succeeded in the first authentication and is closest to the person who failed the first authentication. This enables the gate control system 1 to issue a pinpoint warning to a legitimate user who is likely to be used for tailgating.

[0081] Preferably, the control means 154 controls the opening and closing of the door G depending on whether or not there is a person among the multiple persons P1 to P3 who failed the first authentication. This enables the gate control system 1 to control the door according to the presence or absence of a person attempting to enter by tailgating.

[0082] Preferably, the control means 154 shortens the opening time of door G when there is a person among the multiple persons P1 to P3 who failed the first authentication compared to when there is no person among the multiple persons P1 to P3 who failed the first authentication. This allows the gate control system 1 to suppress tailgating, and when the possibility of tailgating is low, to enable legitimate users to enter the security gate 20 smoothly, thereby preventing legitimate users from lingering near door G.

[0083] Preferably, the control means 154 closes the door G each time the second authentication is performed if there is a person among the multiple persons P1 to P3 who failed the first authentication, and allows the second authentication to be performed continuously with the door G open if there is no person among the multiple persons P1 to P3 who failed the first authentication. This allows the gate control system 1 to suppress tailgating, and when the possibility of tailgating is low, to allow legitimate users to enter the security gate 20 smoothly, thereby preventing legitimate users from lingering near the door G.

[0084] (Modified version of Embodiment 1) In the embodiment 1 described above, the first authentication was gait recognition and the second authentication was card recognition, but the combination of the first and second authentications is not limited to this. For example, the gate control system may use gait recognition as the first authentication and QR code (registered trademark) or other two-dimensional code authentication, facial recognition, iris recognition, fingerprint recognition or other biometric authentication as the second authentication. The gate control system may also use walk-through type facial recognition as the first authentication and card recognition, two-dimensional code authentication, iris recognition or fingerprint recognition as the second authentication. In other words, as long as the first authentication is performed before the second authentication, or in other words, as long as the acquisition location of the authentication target for the first authentication is far from the acquisition location of the authentication target for the second authentication, the combination of the first and second authentications can be any within the above range.

[0085] Furthermore, requiring users to perform authentication actions in both the first and second authentication processes may be inconvenient for them. Therefore, as mentioned above, the first authentication method does not require users to perform any authentication actions and can be performed while the user is walking to enter the building. On the other hand, the second authentication method is an authentication method that requires the user to operate an authentication medium or to perform an action to read biometric information. The specific authentication method can be adopted as appropriate within the above scope. This allows the first authentication to be performed before the second authentication without the user being aware of it.

[0086] Those skilled in the art will understand that various changes, substitutions, and modifications can be made without departing from the spirit and scope of the invention. For example, the embodiments and modifications described above may be combined as appropriate within the scope of the invention. [Explanation of symbols]

[0087] 1. Gate control system 10 Gate Management Server 15. First Processing Unit 152 First Authentication Method 153 Second Authentication Method 154 Control means 20 Security Gates G Door

Claims

1. A gate control system that controls the opening and closing of the regulatory means of a security gate, A first authentication means for authenticating multiple individuals present in the first domain, A second authentication means for authenticating a person who has moved to a second area that is closer to the security gate than the first area, The system includes a control means that controls the release of the restricting means when the second authentication by the second authentication means is successful, The control means, during the second authentication, executes tailgating prevention control depending on whether or not there is a person among the plurality of persons for whom the first authentication by the first authentication means was unsuccessful. A gate control system characterized by the following features.

2. The first authentication is an authentication method that can be performed at a first distance from the imaging unit, and performs authentication using the gait characteristics of a person included in the image acquired by the imaging unit or authentication using the appearance characteristics of a person. The second authentication method is an authentication method that can authenticate at a second distance shorter than the first distance. The gate control system according to claim 1.

3. The first authentication method is an authentication method that does not require an authentication action by the user, and performs authentication using the gait characteristics of a person included in the image acquired by the imaging unit or authentication using the appearance characteristics of a person. The second authentication method described above is an authentication method that requires an authentication action by the user, and performs authentication using static biometric information or authentication using an authentication medium. The gate control system according to claim 1.

4. The first authentication is an authentication method with lower authentication accuracy than the second authentication, wherein the authentication threshold is set so that the false acceptance rate in the first authentication is below a predetermined level, and authentication is performed using the gait characteristics of a person included in the image acquired by the imaging unit or using the appearance characteristics of a person. The gate control system according to claim 1.

5. It further includes a notification unit that outputs guidance information or warning information, The control means controls the notification unit to output the guidance information or the warning information during the second authentication, depending on whether or not there is a person among the plurality of persons for whom the first authentication was unsuccessful. A gate control system according to any one of claims 1 to 4.

6. The control means controls the notification unit to output the warning information to the person among the multiple persons who succeeded in the first authentication and is closest to the person who failed the first authentication, and to output the guidance information to the other persons who succeeded in the first authentication. The gate control system according to claim 5.

7. The control means controls the opening and closing of the restricting means depending on whether or not there is a person among the plurality of persons for whom the first authentication was unsuccessful. A gate control system according to any one of claims 1 to 4.

8. The control means, when there is a person among the plurality of persons for whom the first authentication was unsuccessful, shortens the release time of the restrictive means for persons for whom the second authentication was successful compared to when there is no person among the plurality of persons for whom the first authentication was unsuccessful. The gate control system according to claim 7.

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