CN112070943A - Access control management system based on active RFID technology and face recognition technology - Google Patents
Access control management system based on active RFID technology and face recognition technology Download PDFInfo
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/22—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder
- G07C9/25—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder using biometric data, e.g. fingerprints, iris scans or voice recognition
- G07C9/257—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder using biometric data, e.g. fingerprints, iris scans or voice recognition electronically
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
Abstract
The invention provides an access control management system based on an active RFID (radio frequency identification) technology and a face recognition technology, which comprises an ID card, an access control system, a triggering system and a face recognition processing system, wherein the ID card comprises an LF (low frequency) receiving circuit, an RFID (radio frequency identification) card controller and an RF (radio frequency) transmitting circuit, the access control system comprises an LF transmitting circuit, a standby power supply, an RF (radio frequency) receiving circuit, an access control controller, an interface device and a storage device, the triggering system comprises a temperature sensor and a pressure sensor, the face recognition processing system comprises an image acquisition module and a face recognition processing unit, the access control system can be triggered to work when an object passes through an access control through the triggering system, and meanwhile, the ID card and the image recognition double authentication are adopted, so that the accuracy of access.
Description
Technical Field
The invention relates to the field of intelligent access control, in particular to an access control management system based on an active RFID technology and a face recognition technology.
Background
With the rapid development of computer technology, network technology and wireless communication technology, electronic and communication products have been leaped. Especially, the key breakthrough occurs in the computer vision technology, the camera and the network camera developed by people can collect the head portrait data of people and transmit the head portrait data to the computer through the network and wifi or wireless transmission, the computer can preprocess the head portrait data after receiving the head portrait data of people, then describe the basic model of a human face to identify the human face, identify which person through computer programming, and the application is widely used for access control. For example, only after a person with a specific identity is subjected to systematic correction, the computer acquires an image, the image is sent to the central processing unit for recognition, and then the computer judges that the recognized person is the same as the face model stored in the database, a control instruction can be generated, and the technology of opening the door becomes a face recognition technology. Then, the face recognition technology is widely used in smart gates, such as for personnel access of factories or companies.
The existing access control system generally opens a door by using a face recognition technology or opens a gate of a cell by using an RFID (radio frequency identification) technology, but the two technologies are not combined to open the gate of the cell, and the access control system needs to be always in an open state, so that the service life of the access control system is not facilitated, and the precision is lower when image recognition is carried out.
Disclosure of Invention
Therefore, in order to overcome the above problems, the present invention provides an access control system based on an active RFID technology and a face recognition technology, which includes an ID card, an access control system, a triggering system, and a face recognition processing system, wherein the ID card includes an LF receiving circuit, an RFID card controller, and an RF transmitting circuit, the access control system includes an LF transmitting circuit, a standby power supply, an RF receiving circuit, an access control controller, an interface device, and a storage device, the triggering system includes a temperature sensor and a pressure sensor, the face recognition processing system includes an image acquisition module and a face recognition processing unit, the access control system can be triggered to operate when an object passes through the access control through the triggering system, and meanwhile, the ID card and the image recognition dual authentication are adopted, so that the accuracy of the access control recognition can be further ensured.
The access control management system based on the active RFID technology and the face recognition technology comprises an ID card, an access control system, a triggering system and a face recognition processing system.
The ID card comprises an LF receiving circuit, an RFID card controller and an RF transmitting circuit, the access control system comprises an LF transmitting circuit, a standby power supply, an RF receiving circuit, an access control controller, interface equipment and storage equipment, the trigger system comprises a temperature sensor and a pressure sensor, and the face recognition processing system comprises an image acquisition module and a face recognition processing unit.
The system comprises an LF receiving circuit, an RFID card controller, an RF transmitting circuit, an LF transmitting circuit, an entrance guard controller, an RF receiving circuit, a standby power supply, an interface device, an entrance guard controller, a storage device, an image acquisition module, a face recognition processing unit, a temperature sensor and a pressure sensor, wherein the LF receiving circuit is connected with the RFID card controller, the RFID card controller is connected with the RF transmitting circuit, the LF transmitting circuit is connected with the entrance guard controller, the RF receiving circuit is connected with the entrance guard controller, the standby power supply is connected with the entrance guard controller, the interface device is connected with the entrance guard controller, the storage device is.
The system comprises a pressure sensor, an entrance guard controller, a temperature sensor, a pressure sensor and an entrance guard controller, wherein the pressure sensor is arranged on the ground of the front end of the entrance guard, the pressure sensor is used for sensing a pressure signal of the ground of the front end of the entrance guard, the pressure sensor transmits a detected pressure signal to the entrance guard controller, a pressure threshold range is stored in the entrance guard controller, if the pressure signal received by the entrance guard controller is within the pressure threshold range, the entrance guard controller sends a signal to trigger the temperature sensor to acquire a temperature signal of an object positioned on the pressure sensor, and if the pressure signal received by the entrance guard controller is not within the pressure threshold; the temperature sensor transmits the acquired temperature signal to the access controller, a temperature threshold range is stored in the access controller, if the temperature signal received by the access controller is within the temperature threshold range, the access controller controls the LF transmitting circuit to transmit a 125KHz coding message to the LF receiving circuit, and if the temperature signal received by the access controller is not within the temperature threshold range, the access controller controls the access to be closed; the LF receiving circuit triggers the RFID card controller to work after receiving the message, the RFID card controller controls the RF transmitting circuit to send a signal to the RF receiving circuit, the RF receiving circuit transmits the received signal to the entrance guard controller, the entrance guard controller matches the received signal sent by the RF receiving circuit with the RFID registration information stored in the entrance guard controller, if the received signal is consistent with the RFID registration information, the entrance guard controller sends the signal to the image acquisition module, and if the received signal is inconsistent with the RFID registration information, the entrance guard controller controls entrance guard to close; the method comprises the steps that an image acquisition module starts to acquire face image information of a human body located at the front end of an entrance guard after receiving a trigger signal, the image acquisition module transmits the acquired image information to a face recognition processing unit, the face recognition processing unit processes the received image information and then transmits the processed image information to an entrance guard controller through interface equipment, an image of an entered person is stored in storage equipment, the entrance guard controller compares the received image with the image stored in the storage equipment, if the received image is consistent with the image stored in the storage equipment, the entrance guard controller controls entrance guard to be opened, and if the received image is inconsistent with the image stored in the storage equipment, the entrance guard controller controls entrance guard to be; the standby power supply provides electric power support for the access controller.
Specifically, the temperature sensor is an infrared temperature sensor.
Specifically, the step of the face recognition processing unit performing image processing on the received image information is as follows:
step 1: and collecting the face image of the human body by using the first camera and the second camera.
Step 2: and comparing the images acquired by the first camera and the second camera by using a face recognition processing unit, selecting image information acquired by the first camera and the second camera, and extracting the image information, wherein the image information positioned on the first camera is set A, and the image information positioned on the first camera is set B.
And step 3: the face recognition processing unit performs image denoising processing on the images in the image set A and the image set B, the image in the image set A is An, the image in the image set B is Bn, n is the number of the images stored in the image set A, B, the image in the image set A is An, the image set X is generated after the image denoising processing is performed on the image, and the image in the image set B is Bn, the image set Y is generated after the image denoising processing is performed on the image.
And 4, step 4: the face recognition processing unit extracts the contour of each image Xn in the image set X, simultaneously extracts the contour of each image Yn in the image set Y, compares each image in the image set X with each image in the image set Y, selects the images with the same contour in the images Xn and Yn, and generates an image set C.
And 5: and transmitting the image set C to the access controller through the interface device.
Specifically, still be equipped with a signal processing module in the access control ware, signal processing module transmits the temperature signal to the access control ware in to temperature sensor, and concrete step is as follows:
step 1: the temperature sensor collects temperature signals x (1), x (2) … x (k) … x(s) of a test object within a preset time T, wherein s is the number of sampling points, k is a natural number between 1 and s, and the temperature sensor transmits the collected temperature signals to a signal processing module in the access controller.
Step 2: the signal processing module performs denoising processing on the received temperature signals x (1), x (2) … x (k) … x(s), and if Noise signals Noise extracted are:
and step 3: the signal processing module obtains the temperature signals y (1), y (2) … y (k) … y(s) after removing the Noise signals according to the Noise signals Noise,
and 4, step 4: the signal processing module extracts the positive peak values y1 and y2 … yk … ys of the temperature signals y (1), y (2) … y (k) … y(s), and compares the values y1 and y2 … yk … ys with the temperature threshold range stored in the gate controller.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides an access control management system based on an active RFID (radio frequency identification) technology and a face recognition technology, which comprises an ID card, an access control system, a triggering system and a face recognition processing system, wherein the ID card comprises an LF (low frequency) receiving circuit, an RFID (radio frequency identification) card controller and an RF (radio frequency) transmitting circuit, the access control system comprises an LF transmitting circuit, a standby power supply, an RF (radio frequency) receiving circuit, an access control controller, an interface device and a storage device, the triggering system comprises a temperature sensor and a pressure sensor, the face recognition processing system comprises an image acquisition module and a face recognition processing unit, the access control system can be triggered to work when an object passes through an access control through the triggering system, and meanwhile, the ID card and the image recognition double authentication are adopted, so that the accuracy of access.
(2) The invention also provides an access control management system based on the active RFID technology and the face recognition technology, which is characterized in that an ID card and an access control controller are in a sleep state most of the time, the access control controller is awakened by a trigger signal, the ID card is awakened by a 125KHz coded message sent by an LF transmitting circuit of the access control controller, and wireless two-way communication is realized between the ID card and the access control controller for data transmission. The bidirectional communication is mainly used for reducing the power consumption of the system, and the access controller cannot continuously send the LF message polling ID card after sending the LF message. The trigger signal is an infrared signal or a capacitive proximity detector to wake up the LF transmitting module of the access controller from a sleep mode or a power-down mode.
(3) The invention provides an access control management system based on an active RFID technology and a face recognition technology, which is characterized in that two cameras are adopted to obtain face images from different angles, and in view of the fact that the face is in continuous action and the expression of the face is changed when the images are obtained, the face images are obtained from different angles, and then comparison is carried out, and the selected consistent images obtained from different angles are closer to the standard image of the face.
(4) The invention also provides an access control management system based on the active RFID technology and the face recognition technology, which is characterized in that whether the person entering the access control system is a human body is judged when the temperature sensor is used, therefore, the accuracy of temperature monitoring is crucial, and the signal processing module is used for denoising the temperature signals acquired by the temperature sensor, the method compares the data of a plurality of sampling points within a preset time in pairs to obtain the difference of signals of adjacent acquisition points, therefore, the difference of the noise signals is obtained, all the noise signals in the preset time can be effectively extracted after all the differences are superposed, because the noise signal is stable within a certain time, the obtained noise signal can be used for filtering the signal of each sampling point, and the accuracy of temperature monitoring is further improved.
Drawings
Fig. 1 is a functional diagram of an access control management system based on active RFID technology and face recognition technology according to the present invention;
FIG. 2 is a schematic diagram of an image acquisition module of the present invention;
FIG. 3 is a schematic view of a first camera of the present invention;
fig. 4 is a schematic view of a second camera of the present invention.
Detailed Description
The access control management system based on the active RFID technology and the face recognition technology provided by the present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the access control system based on the active RFID technology and the face recognition technology provided by the present invention includes an ID card, an access control system, a trigger system, and a face recognition processing system.
The ID card comprises an LF receiving circuit, an RFID card controller and an RF transmitting circuit, the access control system comprises an LF transmitting circuit, a standby power supply, an RF receiving circuit, an access control controller, interface equipment and storage equipment, the trigger system comprises a temperature sensor and a pressure sensor, and the face recognition processing system comprises an image acquisition module and a face recognition processing unit.
The system comprises an LF receiving circuit, an RFID card controller, an RF transmitting circuit, an LF transmitting circuit, an access controller, an RF receiving circuit, a standby power supply, an interface device, a storage device, an image acquisition module, a face recognition processing unit, a temperature sensor and a pressure sensor, wherein the LF receiving circuit is connected with the RFID card controller, the RFID card controller is connected with the RF transmitting circuit, the LF transmitting circuit is connected with the access controller, the RF receiving circuit is connected with the access controller, the standby power supply is connected with the access controller, the interface device is connected with the access controller, the storage device is connected with the access controller, the image acquisition module;
the system comprises a pressure sensor, an entrance guard controller, a temperature sensor, a pressure sensor and an entrance guard controller, wherein the pressure sensor is arranged on the ground of the front end of the entrance guard, the pressure sensor is used for sensing a pressure signal of the ground of the front end of the entrance guard, the pressure sensor transmits a detected pressure signal to the entrance guard controller, a pressure threshold range is stored in the entrance guard controller, if the pressure signal received by the entrance guard controller is within the pressure threshold range, the entrance guard controller sends a signal to trigger the temperature sensor to acquire a temperature signal of an object positioned on the pressure sensor, and if the pressure signal received by the entrance guard controller is not within the pressure threshold; the temperature sensor transmits the acquired temperature signal to the access controller, a temperature threshold range is stored in the access controller, if the temperature signal received by the access controller is within the temperature threshold range, the access controller controls the LF transmitting circuit to transmit a 125KHz coding message to the LF receiving circuit, and if the temperature signal received by the access controller is not within the temperature threshold range, the access controller controls the access to be closed; the LF receiving circuit triggers the RFID card controller to work after receiving the message, the RFID card controller controls the RF transmitting circuit to send a signal to the RF receiving circuit, the RF receiving circuit transmits the received signal to the entrance guard controller, the entrance guard controller matches the received signal sent by the RF receiving circuit with the RFID registration information stored in the entrance guard controller, if the received signal is consistent with the RFID registration information, the entrance guard controller sends the signal to the image acquisition module, and if the received signal is inconsistent with the RFID registration information, the entrance guard controller controls entrance guard to close; the method comprises the steps that an image acquisition module starts to acquire face image information of a human body located at the front end of an entrance guard after receiving a trigger signal, the image acquisition module transmits the acquired image information to a face recognition processing unit, the face recognition processing unit processes the received image information and then transmits the processed image information to an entrance guard controller through interface equipment, an image of an entered person is stored in storage equipment, the entrance guard controller compares the received image with the image stored in the storage equipment, if the received image is consistent with the image stored in the storage equipment, the entrance guard controller controls entrance guard to be opened, and if the received image is inconsistent with the image stored in the storage equipment, the entrance guard controller controls entrance guard to be; the standby power supply provides electric power support for the access controller.
In the above embodiment, the present invention provides an access control management system based on an active RFID technology and a face recognition technology, which includes an ID card, an access control system, a triggering system, and a face recognition processing system, where the ID card includes an LF receiving circuit, an RFID card controller, and an RF transmitting circuit, the access control system includes an LF transmitting circuit, a standby power supply, an RF receiving circuit, an access control controller, an interface device, and a storage device, the triggering system includes a temperature sensor and a pressure sensor, the face recognition processing system includes an image acquisition module and a face recognition processing unit, the triggering system can trigger the access control system to operate when an object passes through an access control, and meanwhile, the ID card and image recognition double authentication is adopted, so as to further ensure accuracy of access recognition.
Further, when an object passes through the access control system, the pressure sensor can sense a pressure signal of the object, the temperature sensor is used for obtaining the temperature signal of the object to know whether the object is a human body, the access control system is awakened if the object is the human body, and the access control system is in a dormant state if the object is not the human body.
Furthermore, after the entrance guard system to be entered is judged to be a human body, the entrance guard control system wakes up the ID recognition function, and after the ID recognition is passed, the image acquisition module and the face recognition processing unit are used for face recognition, so that the identity of the person entering the entrance guard is further confirmed, and therefore the entrance guard can be effectively prevented from being stolen by using an ID card of another person or entering the entrance guard by modifying a standard image (namely image information of a person permitted to enter the entrance guard system) in the entrance guard system.
Further, the temperature sensor is an infrared temperature sensor.
The ID card and the entrance guard controller are in a sleep state most of the time, the entrance guard controller is awakened by a trigger signal, the ID card is awakened by a 125KHz coded message sent by an LF (low frequency) transmitting circuit of the entrance guard controller, and wireless two-way communication is realized between the ID card and the entrance guard controller for data transmission. The bidirectional communication is mainly used for reducing the power consumption of the system, and the access controller cannot continuously send the LF message polling ID card after sending the LF message. The trigger signal is an infrared signal or a capacitive proximity detector to wake up the LF transmitting module of the access controller from a sleep mode or a power-down mode.
The access control management system based on the active RFID technology and the face recognition technology mainly comprises an access control controller, an ID card, an access control system, a trigger system and a face recognition processing system. The entrance guard controller polls the ID card through the low-frequency communication interface on one hand, receives the identity information data of the ID card on the other hand, and further judges whether the RFID information is legal or not, and if the RFID information is abnormal, the entrance guard controller gives an alarm in time. Meanwhile, the entrance guard controller is also communicated with the management host in a TCP/IP mode, the entrance guard controller realizes the functions of alarming and door locking through the alarm circuit and the door locking circuit, and the alarm circuit is triggered to alarm when the entrance guard controller controls the entrance guard to be closed.
The entrance guard controller awakens the ID card through the LF transmitting circuit and the LF receiving circuit and receives data from the ID card through the RF receiving circuit.
The ID card mainly comprises an LF receiving circuit, an RF transmitting circuit and an RFID card controller. The ID card transmits RFID information through an RF transmitting circuit, wireless two-way communication is completed between the ID card and the access controller, and automatic operation of the system is achieved. RFID messaging requires the use of encryption algorithms to ensure its security.
The access control management system based on the active RFID technology and the face recognition technology provided by the invention is in an automatic working state after being started by adopting the access control system with double authentication of the RFID technology and the face recognition technology, and does not need manual intervention.
The access control management system based on the active RFID technology and the face recognition technology provided by the invention has the advantages that the personnel information must be registered before installation and use, and the system can be normally used after registration. The modeling login, the addition, the modification or the deletion of the personnel information can be carried out only by a system administrator or a designated user.
As shown in fig. 2, the image capturing module includes a first camera and a second camera, which are respectively disposed at different positions suitable for capturing images of a human face, and are used for capturing images of the human face. For example, they may be placed at a distance in the horizontal direction or at a distance in the vertical direction, and preferably they may be placed at the same height and at a distance of, for example, 10 cm. The first camera and the second camera are respectively electrically connected with the face recognition processing unit and used for transmitting signals to the face recognition processing unit.
The face recognition processing unit can adopt a personal computer platform or an embedded platform, such as a DSP, an ARM and the like. The human stands in a certain range in front of the first camera and the second camera, the first camera and the second camera respectively capture face images, and the face images are transmitted to the face recognition processing unit. The face recognition processing unit respectively performs face recognition processing by utilizing image information respectively captured by the two cameras so as to enhance the adaptability of face recognition to light, postures and expressions. In order to enhance the adaptability of the face recognition to light, the invention can provide an active light source for the image acquisition module.
Further, an infrared light fixed active light source is adopted as a light source for capturing a human face image, so that the adaptability of human face recognition to light rays is enhanced. The infrared light fixed active light source consists of a plurality of infrared light emitting diodes which are uniformly distributed, the central wavelength is 700 to 2000nm, preferably 850nm, and the light source can be arranged behind the first camera and the second camera.
The two cameras collect face images with the same property, for example, an infrared light transmission and filtering device is arranged in front of the two cameras for filtering visible light to collect black and white face images, or an infrared light cut and filtering device is arranged in front of the two cameras for filtering infrared light to collect color face images.
As shown in fig. 3-4, in order to improve the recognition rate, two cameras may collect face images with different properties. For example, a first camera captures a black and white image and a second camera captures a color image. In order to protect the lens of the camera from ambient light, it is preferable that an infrared light transmission filter having a function of filtering visible light and passing infrared light is installed in front of the lens of the second camera or a filter film is directly plated on the lens, so as to directly capture a black-and-white grayscale image. And in order to make the lens of the camera not affected by infrared light, preferably, an infrared light cut-off filter with the functions of filtering infrared light and passing visible light can be installed in front of the lens of another camera, or a filter film is directly plated on the lens to capture a color image. The image sensor of the first camera or the second camera can adopt CMOS or CCD.
In addition, the access control management system based on the active RFID technology and the face recognition technology further comprises a display unit, and when one of the first camera and the second camera collects the colorful face image, the display unit is used for receiving and displaying the colorful face image collected by the camera. The step of the face recognition processing unit carrying out image processing on the received image information is as follows:
step 1: collecting human face images by using a first camera and a second camera;
step 2: comparing the images acquired by the first camera and the second camera by using a face recognition processing unit, selecting image information acquired by the first camera and the second camera, and extracting the image information, wherein the image information positioned on the first camera is set A, and the image information positioned on the first camera is set B;
and step 3: the face recognition processing unit performs image denoising processing on images in the image set A and the image set B, wherein the image in the image set A is An, the image in the image set B is Bn, n is the number of images stored in the image set A, B, the image in the image set A is An, the image set X is generated after the image denoising processing is performed on the image, and the image in the image set B is Bn, the image set Y is generated after the image denoising processing is performed on the image;
and 4, step 4: the face recognition processing unit extracts the contour of each image Xn in the image set X, simultaneously extracts the contour of each image Yn in the image set Y, compares each image in the image set X with each image in the image set Y, selects images with the same contour in the images Xn and Yn, and generates an image set C;
and 5: and transmitting the image set C to the access controller through the interface device.
In the above embodiment, the two cameras are used to obtain the face images from different angles, and in view of the fact that the face is in continuous motion and the expression of the face is changed when the images are obtained, the face images are obtained from different angles and compared, and the selected consistent images obtained from different angles are closer to the standard image of the face.
Further, still be equipped with a signal processing module in the access control ware, the temperature signal of signal processing module in to temperature sensor transmission to the access control ware, concrete step is as follows:
step 1: the temperature sensor collects temperature signals x (1), x (2) … x (k) … x(s) of a test object within a preset time T, wherein s is the number of sampling points, k is a natural number between 1 and s, and the temperature sensor transmits the collected temperature signals to a signal processing module in the access controller.
Step 2: the signal processing module performs denoising processing on the received temperature signals x (1), x (2) … x (k) … x(s), and if Noise signals Noise extracted are:
and step 3: the signal processing module obtains the temperature signals y (1), y (2) … y (k) … y(s) after removing the Noise signals according to the Noise signals Noise,
and 4, step 4: the signal processing module extracts the positive peak values y1 and y2 … yk … ys of the temperature signals y (1), y (2) … y (k) … y(s), and compares the values y1 and y2 … yk … ys with the temperature threshold range stored in the gate controller.
In the above embodiment, because whether the judgement gets into the access control system during temperature sensor is the human body, so temperature monitoring's precision is crucial, here, use signal processing module to denoise the temperature signal that temperature sensor gathered, it is through carrying out two liang of comparisons in order to learn the difference of adjacent acquisition point signal to the data of a plurality of sampling point in the time of predetermineeing, learn the difference of noise signal from this, can effectively extract all noise signal in the time of predetermineeing after making all differences stack again, because the noise signal in the certain time is stable, therefore, the noise signal who seeks by this can be used for carrying out filtering process to the signal of each sampling point, temperature monitoring's precision has further been increased.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. The access control system based on the active RFID technology and the face recognition technology is characterized by comprising an ID card, an access control system, a triggering system and a face recognition processing system;
the system comprises an ID card, a trigger system and a face recognition processing system, wherein the ID card comprises an LF receiving circuit, an RFID card controller and an RF transmitting circuit, the access control system comprises an LF transmitting circuit, a standby power supply, an RF receiving circuit, an access controller, an interface device and a storage device, the trigger system comprises a temperature sensor and a pressure sensor, and the face recognition processing system comprises an image acquisition module and a face recognition processing unit;
the system comprises an LF receiving circuit, an RFID card controller, an RF transmitting circuit, an access controller, an RF receiving circuit, an emergency power supply, an interface device, an access controller, a storage device, an image acquisition module, a face recognition processing unit, a temperature sensor and a pressure sensor, wherein the LF receiving circuit is connected with the RFID card controller, the RFID card controller is connected with the RF transmitting circuit, the LF transmitting circuit is connected with the access controller, the RF receiving circuit is connected with the access controller, the emergency power supply is connected with the access controller, the interface device is connected with the access controller, the storage device is connected with the access controller, the image acquisition module is connected with the face recognition processing unit, the face recognition processing unit is connected with the interface device, and;
the pressure sensor is arranged on the ground of the front end of the entrance guard, the pressure sensor is used for sensing a pressure signal of the ground of the front end of the entrance guard, the pressure sensor transmits a detected pressure signal to the entrance guard controller, a pressure threshold range is stored in the entrance guard controller, if the pressure signal received by the entrance guard controller is within the pressure threshold range, the entrance guard controller sends a signal to trigger the temperature sensor to acquire a temperature signal of an object positioned on the pressure sensor, and if the pressure signal received by the entrance guard controller is not within the pressure threshold range, the entrance guard controller controls the entrance guard to be closed; the temperature sensor transmits the acquired temperature signal to the access controller, a temperature threshold range is stored in the access controller, if the temperature signal received by the access controller is within the temperature threshold range, the access controller controls the LF transmitting circuit to transmit a 125KHz coding message to the LF receiving circuit, and if the temperature signal received by the access controller is not within the temperature threshold range, the access controller controls the access to be closed; the LF receiving circuit triggers the RFID card controller to work after receiving a message, the RFID card controller controls the RF transmitting circuit to send a signal to the RF receiving circuit, the RF receiving circuit transmits the received signal to the access controller, the access controller matches the received signal sent by the RF receiving circuit with RFID registration information stored in the access controller, if the signal is consistent, the access controller sends a signal to the image acquisition module, and if the signal is inconsistent, the access controller controls the access to be closed; the image acquisition module starts to acquire human face image information positioned at the front end of the access control after receiving a trigger signal, the image acquisition module transmits the acquired image information to the face recognition processing unit, the face recognition processing unit processes the received image information and then transmits the processed image information to the access control through the interface equipment, the storage equipment stores recorded personnel images, the access control compares the received images with the images stored in the storage equipment, if the received images are consistent with the images stored in the storage equipment, the access control controls the access control to be opened, and if the received images are inconsistent with the images stored in the storage equipment, the access control controls the access control to be closed; the standby power supply provides electric power support for the access controller.
2. The access control system based on the active RFID technology and the face recognition technology as claimed in claim 1, wherein the temperature sensor is an infrared temperature sensor.
3. The access control system based on the active RFID technology and the face recognition technology as claimed in claim 1, wherein the face recognition processing unit performs image processing on the received image information as follows:
step 1: collecting human face images by using the first camera and the second camera;
step 2: comparing the images acquired by the first camera and the second camera by using the face recognition processing unit, selecting image information acquired by the first camera and the second camera, and extracting the image information, wherein the image information positioned on the first camera is set A, and the image information positioned on the first camera is set B;
and step 3: the face recognition processing unit carries out image denoising processing on images in the image set A and the image set B, wherein the image in the image set A is An, the image in the image set B is Bn, n is the number of the images stored in the image set A, B, the image in the image set A is An, the image set X is generated after the image denoising processing is carried out on the image in the image set A, and the image in the image set B is Bn, the image set Y is generated after the image denoising processing is carried out on the image in the image set B;
and 4, step 4: the face recognition processing unit extracts the contour of each image Xn in the image set X, simultaneously extracts the contour of each image Yn in the image set Y, compares each image in the image set X with each image in the image set Y, selects images with the same contour in the images Xn and Yn, and generates an image set C;
and 5: and transmitting the image set C to the access controller through the interface equipment.
4. The access control system based on the active RFID technology and the face recognition technology as claimed in claim 1, wherein a signal processing module is further arranged in the access control device, and the signal processing module is used for transmitting the temperature signal transmitted from the temperature sensor to the access control device, and the specific steps are as follows:
step 1: the temperature sensor collects temperature signals x (1), x (2) … x (k) … x(s) of a test object within a preset time T, wherein s is the number of sampling points, k is a natural number between 1 and s, and the temperature sensor transmits the collected temperature signals to a signal processing module in the access controller;
step 2: the signal processing module performs denoising processing on the received temperature signals x (1), x (2) … x (k) … x(s), and if Noise signals Noise extracted are:
and step 3: the signal processing module obtains the temperature signals y (1), y (2) … y (k) … y(s) after the Noise signals are removed according to the Noise signals Noise, if yes,
and 4, step 4: the signal processing module extracts positive peak values y1 and y2 … yk … ys of temperature signals y (1), y (2) … y (k) … y(s), and compares the values y1 and y2 … yk … ys with the temperature threshold range stored in the access controller.
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