CN111175839A - Vertical elevator type millimeter wave security inspection system and security inspection method - Google Patents
Vertical elevator type millimeter wave security inspection system and security inspection method Download PDFInfo
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- CN111175839A CN111175839A CN201911350808.1A CN201911350808A CN111175839A CN 111175839 A CN111175839 A CN 111175839A CN 201911350808 A CN201911350808 A CN 201911350808A CN 111175839 A CN111175839 A CN 111175839A
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Abstract
The invention discloses a vertical elevator type millimeter wave security inspection system and a security inspection method, wherein the system comprises a security inspection cabin, a well, a mechanical driving device, a linear array scanning unit, a signal acquisition processing module, a control module, an imaging display module and an automatic identification module; the mechanical driving device can drive the lift car to stably run in the hoistway; the linear array scanning unit comprises a plurality of millimeter wave sources, a plurality of millimeter wave detectors and a main body; the millimeter wave sources and the millimeter wave detectors are arranged at intervals to form an array structure and are arranged in front of and behind the main body; the signal acquisition processing module is connected with the millimeter wave detector; the control module is connected with the mechanical scanning mechanism. The invention adopts the synthetic aperture imaging principle and the sparse array, has simple structure and low cost; adopt reasonable comfortable perpendicular elevator formula safety inspection cabin, realize the safety inspection full automatization, easy operation need not special personnel and reminds the wait to examine personnel, has greatly improved the user experience who waits to examine personnel, and current efficient.
Description
Technical Field
The invention belongs to the technical field of security inspection, and particularly relates to a vertical elevator type millimeter wave security inspection system and a security inspection method.
Background
With the rapid increase of the people flow and terrorist activities in large public places, the requirement of human body security inspection is increasing day by day. However, the safety detection means widely used for human bodies in public places such as airports, stations and the like are mainly metal detectors, ion spectrometers and X-ray detectors. The metal detector can only detect metal objects carried by a human body, the ion spectrometer is mainly used for detecting whether the human body carries explosives, and the X-ray detector is mainly used for detecting luggage objects and the like carried about and cannot detect the human body. Therefore, the research on the novel safe, reliable and quick human body security inspection technology is widely regarded. Among them, millimeter wave and terahertz wave technologies have gradually become research hotspots in recent years and are applied to the field of human body security inspection. Millimeter wave and terahertz wave have low photon energy, almost do not harm human bodies, have better penetrability to materials such as textiles and leather, and are easy to obtain higher spatial resolution.
In view of the application trend, patent document No. 201710778390.9 discloses an active terahertz security inspection imaging method and system, and the method and system adopt modes of terahertz source active emission terahertz radiation, one-dimensional scanning of a strip-shaped focused beam and receiving of a linear array terahertz detector to complete irradiation and scanning of the whole target plane, so as to achieve the purpose of imaging and inspecting the target. However, the number of detectors required by the method and the system is large, and the system cost is extremely high and is difficult to popularize because the conventional terahertz device is expensive. The patent document with the application number of 201610262003.1 discloses a three-dimensional holographic imaging security inspection system and a method thereof, and the patent application provides a millimeter wave security inspection system and a method adopting a rotary scanning mode. Although the cost of the detection unit is reduced, the method and the system have obvious disadvantages, such as time consumption, uncomfortable noise generation and poor user experience due to the adoption of a rotary scanning method.
Disclosure of Invention
The invention provides a vertical elevator type millimeter wave security inspection system which is simple in structure and high in security inspection efficiency.
The technical scheme of the invention is as follows: a vertical elevator type millimeter wave security inspection system comprises:
a control module;
the safety inspection cabin comprises a lift car, an inlet arranged on the lift car and an outlet arranged on the lift car, and a detection area for arranging a person to be detected is formed in the inner area of the lift car;
the shaft is matched with the lift car;
the mechanical driving device is controlled by the control module and is used for driving the lift car to do lifting motion on the shaft;
the linear array scanning unit comprises a main body arranged in the middle of the shaft, a plurality of millimeter wave sources arranged on the main body in an array mode and a plurality of millimeter wave detectors arranged on the main body in an array mode;
the signal acquisition processing module is used for receiving the detection signal of the millimeter wave detector and processing the detection signal;
the imaging display module is controlled by the control module and connected with the signal acquisition and processing module, performs image reconstruction on the information processed by the signal acquisition and processing module to synthesize a three-dimensional image, and performs differential display on different objects;
the automatic identification module is connected with the imaging display module, can acquire image data information displayed by the imaging display module, performs artificial intelligence operation on the image data information, and automatically performs forbidden articles judgment prompt.
Preferably, the security check cabin further comprises a metal detection plate arranged in the detection area and used for a person to be detected to stand, the metal detection plate is connected with the automatic identification module and sends a detection signal to the automatic identification module, and the automatic identification module carries out operation processing on the detection signal and automatically carries out judgment prompt on whether metal objects exist. According to the invention, the detection is carried out through the metal detection plate, so that the defect that the sole cannot be detected through millimeter wave scanning can be made up.
Preferably, the system further comprises a compound gate with an identity identification module. Before the person to be detected enters the detection area, the identity recognition module on the rechecking gate can be used for carrying out identity recognition, for example, the identity recognition can be carried out in an identity card brushing mode, and the security inspection effect is further enhanced.
Preferably, the security inspection cabin comprises two outlets, wherein the two outlets are respectively a security inspection outlet for passing the qualified person to be inspected in the security inspection and a re-inspection outlet for passing the unqualified person to be inspected in the security inspection. Two exits may increase the traffic rate.
Preferably, the millimeter wave sources and the millimeter wave detectors are arranged at intervals in a periodic co-prime sparse array structure, the number of the millimeter wave sources is N1, the number of the millimeter wave detectors is N2, the length of the array period is D, wherein N1 and N2 are co-prime, the array element spacing of the millimeter wave sources is D/N1, the array element spacing of the millimeter wave detectors is D/N2, the sparsity a can be calculated according to the formula (1),
α＝2N1N2/(N1+N2) (1)。
preferably, the frequency band of the millimeter wave source is 26.5 GHz-1000 GHz.
Preferably, the linear scanning units are uniformly arranged along the circumferential direction of the hoistway.
The invention also provides a security inspection method using the vertical elevator type millimeter wave security inspection system, which comprises the following steps:
(a) a preparation stage: a person to be detected enters a detection area of the security inspection cabin and stands at the detection area;
(b) and (3) running scanning: the control module controls the mechanical driving device to drive the security inspection cabin to vertically run upwards, in the ascending process, the person to be inspected and the linear array scanning unit move relatively, millimeter waves emitted by a millimeter wave source of the linear array scanning unit scan the person to be inspected, and millimeter wave signals reflected or scattered by the person to be inspected are received by the millimeter wave detector; the signal acquisition processing module acquires and processes the millimeter wave signals received by the millimeter wave detector and transmits the processed information to the imaging display module;
(c) image synthesis: the imaging display module synthesizes all information processed by the signal acquisition processing module, and the information is spliced into panoramic images of the front side and the back side of a person to be detected, so that a three-dimensional image of the human body to be detected is synthesized by the imaging display module, and different objects are displayed in a distinguishing way;
(d) automatic identification: and carrying out artificial intelligence algorithm processing according to the obtained image, comparing the image with a standard image database of contraband, and giving out identification information and safety prompt through an automatic identification module.
Preferably, the method further comprises the step (e): the outlet of the security inspection cabin comprises a security inspection outlet for passing the qualified personnel to be detected in the security inspection and a re-inspection outlet for passing the unqualified personnel to be detected in the security inspection, and the personnel to be detected which smoothly pass through the security inspection leave from the security inspection outlet; the personnel to be tested needing manual reinspection leave from the reinspection outlet and then carry out manual reinspection.
Preferably, in the step (c), the signal acquired by the linear array scanning unit is processed by a signal acquisition and processing module in a time domain back projection imaging algorithm.
Preferably, in the step (d), an artificial intelligence algorithm training and detection and recognition process is performed on the panoramic image by using a YOLO algorithm framework.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can drive the lift car to move vertically upwards through the mechanical driving device, so that a person to be detected standing on the lift car and the linear array scanning unit form relative motion, and finally translational linear array scanning is realized.
(2) The vertical elevator type safety inspection cabin is reasonable and comfortable, full automation of safety inspection is realized, the operation is simple, excessive prompt and turning actions are not needed for a user, whole-body scanning can be smoothly completed, and the user experience and the passing rate are greatly improved; in addition, a closed security inspection cabin structure is adopted, so that the safety of security inspection personnel is ensured; the system cost is reduced by adopting a sparse array structure, and the method has important significance for the development and popularization of the millimeter wave security inspection technology; moreover, translational scanning is adopted, the mechanical structure is simple, and the manufacturing cost is low; can be improved on the existing cabin body structure, and is energy-saving and environment-friendly.
(3) The invention can effectively complete the safety inspection work of the human body in public places, well ensures the dignity of the personnel to be detected on the premise of reducing the false inspection rate and the omission factor as much as possible, has low detection cost, comprehensive safety inspection information acquisition and high detection accuracy, and is particularly suitable for being popularized in various safety inspection application scenes.
(4) According to the invention, the person to be detected can complete scanning imaging of the front and back of the human body without a turning link, the turning link is avoided, the smoothness of security inspection is ensured, and the passing rate is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a security inspection system in embodiment 1 of the present invention.
Fig. 2 is a schematic circuit diagram of a security inspection system in embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a linear array scanning unit in embodiment 1 of the present invention.
The system comprises a lift car 11, an entrance 12, a security inspection outlet 131, a rechecking outlet 132, a detection area 1a, a well 2, a motor 31, a steel cable 32, a linear array scanning unit 4, a millimeter wave source 41, a millimeter wave detector 42, a signal acquisition and processing module 5, a control module 6, an imaging display module 7, an automatic identification module 8 and a metal detection plate 9, wherein the lift car is provided with a lift car door; a compound gate 10; the person to be tested 100.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example 1
The embodiment is a security inspection system, which comprises a security inspection cabin, a well 2, a mechanical driving device, a linear array scanning unit 4, a signal acquisition and processing module 5, a control module 6, an imaging display module 7 and an automatic identification module 8.
The security inspection cabin is a completely closed space, and various possible mandatory means are provided for further controlling suspects carrying dangerous contraband. The security screening cabin comprises a car 11, one entrance 12 and two exits 13. A detection area 1a is formed in the security inspection cabin, and the detection area 1a is used for arranging the person to be detected 100. If the field space allows, export 13 can set to two, including security installations export 131 and reinspection export 132, and security installations export 131 supplies the qualified personnel that await measuring of security installations to pass through, and reinspection export 132 supplies the unqualified personnel that await measuring of security installations to pass through, carries out artifical reinspection again. In other embodiments, one or more than two outlets 13 may be provided.
The well 2 is fixed on the periphery of the security inspection chamber, and the motor 31 in the mechanical driving device arranged on the upper part of the well rotates to drive the steel cable 32 connected to the cage 11, so as to complete the control of the lifting motion of the security inspection chamber.
In this embodiment, the linear array scanning unit 4 is disposed in the middle of the hoistway 2. The linear array scanning unit 4 comprises a plurality of millimeter wave sources 41, a plurality of millimeter wave detectors 42 and a main body, wherein the number of the millimeter wave sources 41 and the number of the millimeter wave detectors 42 can be set as required, and the main body is distributed towards the periphery of the area to be detected 1 a. The front and rear of the main body are provided with a millimeter wave source 41 and a millimeter wave detector 42. And the millimeter wave sources 41 and the millimeter wave detectors 42 are arranged in an array structure at intervals on both the front and rear of the body. In the embodiment, a stable and reliable millimeter wave source can be obtained by adopting a multi-stage frequency doubling mode, millimeter waves are generated and received through coupling of the frequency mixing antenna, signal detection is completed through the millimeter wave detector, and stability of active millimeter wave detection is guaranteed.
In this embodiment, the millimeter wave sources 41 and the millimeter wave detectors 42 are arranged at intervals to form a periodic co-prime sparse array structure, and the specific arrangement mode is as follows: the number of the millimeter wave sources 41 is N1, the number of the millimeter wave detectors 42 is N2, N1 and N2 are integers which are not less than 1, the array period length is D, the N1 and the N2 are mutually prime, the array element spacing of the millimeter wave sources 41 is D/N1, and the array element spacing of the millimeter wave detectors 42 is D/N2. For example, in this example, the linear array scanning unit 4 is arranged in a periodic co-prime sparse array structure, which includes three array periods, and the ratio of the number of millimeter wave sources 41 that actively transmit millimeter waves to the number of millimeter wave detectors 42 that receive millimeter wave signals is 5: 6, ensuring the co-prime, calculating the sparsity according to the formula (1),
α＝2N1N2/(N1+N2) (1)；
the sparsity of the sensor can be calculated to reach 5.56, namely 15 millimeter wave sources 41 and 18 millimeter wave detectors 42 are adopted in total, 33 actual elements are arranged at intervals in a discrete cycle to form a sparse array structure, the sparse array structure is equivalent to 180 detection elements, and the cost of the device is greatly reduced on the premise of ensuring the imaging quality.
The signals obtained by the linear array scanning unit 4 are processed, and the original data are directly projected onto a final imaging plane by adopting a Back Projection (BP) imaging algorithm without positioning operation, the obtained image is the scattering intensity of a real three-dimensional space position, so that the subsequent synthesis operation is facilitated, meanwhile, the error of calculation by adopting an approximately uniform linear array is avoided, the requirement on the array structure is avoided, and the method is suitable for being applied to a large-sparsity co-prime periodic array.
In the example, four linear array scanning units 4 are selected to be arranged in the middle of the well 2 and form a scanning section, so that the direction of the person 100 to be detected does not need to be limited, and the person is more free and convenient; if more consideration needs to be given to the cost, or only two linear array scanning units 4 can be arranged and arranged oppositely, the person to be inspected needs to limit the direction facing the linear array scanning units 4.
When the mechanical driving device drives the vertical elevator car 11 to move vertically upwards, the person to be detected 100 standing on the vertical elevator car and the linear array scanning unit 4 form relative motion, and finally translational scanning is completed. The millimeter wave emitted by the millimeter wave source 41 with a sparse array structure in the linear array scanning unit 4 scans the human body to be detected, and the millimeter wave scanning imaging of the whole human body is realized. In this example, when a human body is detected, the linear array scanning unit 4 performs detection and imaging algorithm processing on a part of the region at each moment, and images the received millimeter waves by using the principle of synthetic aperture radar holographic imaging, thereby avoiding optical focusing processing required by optical imaging.
The signal acquisition processing module 5 is connected with the millimeter wave detector 42, and the signal acquisition processing module 5 can acquire and process signals of the millimeter wave detector 42. The control module 6 is connected with a mechanical driving device. The control module 6 adopts the existing controller. The control module 6 can conveniently control the coordination work of the modules.
The imaging display module 7 is connected with the signal acquisition processing module 5, performs image reconstruction on the processed signals to synthesize a three-dimensional image, and performs differential display on different objects to adapt to different working requirements. The imaging display module 7 is connected with the control module 6. In this example, the millimeter wave detector 42 detects the signal, and the signal acquisition processing module 5 processes the signal and converts the signal into a segmented local image signal for subsequent algorithm processing. The imaging display module 7 synthesizes the local images at different moments formed by the signal acquisition processing module 5 to obtain a complete target image.
In this example, the imaging display module 7 displays the synthesized panoramic image. Preferably, two paths of display output can be adopted, wherein one path of display output is output to a security check personnel console and comprises all imaging information, so that security check personnel can check the imaging information of personnel to be checked in an all-round manner and perform multi-angle analysis processing. And the other path of the signal is output to external display equipment for public environment to watch and display. The signal of the path is in consideration of protecting personal privacy, cartoon figure image simulation display is adopted, and only area prompt processing is carried out on related detection objects. Automatic identification module 8 connects formation of image display module 7, and automatic identification module 8 carries out artificial intelligence operation to acquireing image data, carries out contraband voluntarily and judges the suggestion, prevents the careless omission that artifical detected. In addition. Be equipped with metal detecting plate 9 in detection zone 1a, this metal detecting plate 9 is used for await measuring personnel 100 to stand, and automatic identification module 8 is connected to this metal detecting plate 9.
In this example, automatic identification module 8 is used for carrying out artificial intelligence to synthetic panoramic image and calculates, and then contrasts with contraband image database, carries out automatic identification and suggestion to its dangerous degree, prevents the careless omission of artifical detection, accomplishes all the things. If the automatic identification of the individual article is difficult, the security personnel can be prompted to carry out manual reinspection.
In this example, the detection result of the metal detection plate can also be directly connected with the security check server, and the detection condition of the metal on the sole is automatically prompted.
In this example, the entrance 12 can be added with a compound gate 10 with an identity recognition function, and the person 100 to be tested can enter the vertical elevator security inspection cabin autonomously by brushing the identity document.
In the embodiment, the terahertz wave imaging security inspection method can be applied to the field of terahertz wave imaging security inspection by changing the frequency of the output electromagnetic wave of the millimeter wave source 41.
Example 2
The embodiment is a security inspection method of embodiment 1, which specifically includes the following steps:
(a) a preparation stage: the system is started, and the person to be detected is guided to the front of the entrance 12 of the security inspection cabin, and is prompted to brush the identity document to enter the vertical elevator car 11 through the composite gate 10.
In the step (a), the person to be detected can be prompted to lift two hands after entering the lift car 11, and the whole body, particularly the armpit, is exposed, so as to ensure the integrity of the detection area.
(b) And (3) running scanning: the control module 6 controls the mechanical driving device to drive the vertical elevator car 11 to move vertically upwards, so that the person 100 to be detected standing on the control module and the linear array scanning unit 4 move relatively, millimeter waves emitted by a millimeter wave source 41 of the linear array scanning unit 4 scan the person 100 to be detected, millimeter wave signals reflected or scattered by the person 100 to be detected are received by the millimeter wave detector 42, and the signal acquisition processing module 5 acquires and processes the millimeter wave signals received by the millimeter wave detector 42.
In the step (b), the specific way of processing the signals obtained by the linear array scanning unit through the signal acquisition processing module 5 is to adopt a time domain back projection imaging algorithm.
In the step (b), the person to be detected can complete scanning imaging of the front and the back of the human body without a turning link, so that the turning link is avoided, smoothness of security inspection is guaranteed, and the passing rate is greatly improved.
In the step (b), the coordinates of the linear array scanning unit are automatically recorded in real time, and a mapping equation is established for image synthesis of the detected area at different moments.
(c) Image synthesis: after the step (b) is completed, the imaging display module 7 synthesizes all signals processed by the signal acquisition processing module 5, and the panoramic images of the front side and the back side of the person to be detected are spliced, so that the imaging display module 7 synthesizes the three-dimensional image of the human body to be detected, and different display is performed on different objects. In this step, the imaging display module 7 performs focus imaging by the principle of Synthetic Aperture Radar (SAR) imaging. In consideration of the requirement of real-time imaging, the signal acquired by the linear array scanning unit 4 is processed by the signal acquisition processing module 5, and the original data is directly projected onto the final imaging plane by adopting a time domain Back Projection (BP) imaging algorithm without positioning operation, so that the obtained image is the scattering intensity of a real three-dimensional space position, the subsequent synthesis operation is convenient, meanwhile, the error of calculation by adopting an approximately uniform linear array is avoided, the array structure is not required, and the method is suitable for being applied to the large-sparsity co-prime periodic array in the embodiment. Preferably, a block BP imaging algorithm can be adopted, the calculation amount of the algorithm is reduced, and real-time imaging can be realized by combining a GPU parallel computing technology.
And (c) in the image synthesis process, in order to ensure the individual privacy of the person to be detected, performing partial cartoon treatment on the displayed image.
(d) Automatic identification: and carrying out artificial intelligence algorithm processing according to the obtained image, comparing the processed image with a standard image database of contraband, and giving out identification information and safety prompt through the automatic identification module 8.
In the step (d), intelligent judgment and safety prompt are carried out on the special objects in the panoramic image through a depth learning algorithm preset in the automatic identification module 8. In this example, a framework based on the YOLO (You Only Look Onec) algorithm is employed. And extracting features by adopting a convolutional network, and obtaining a predicted value by using a full connection layer. The network structure contains 24 convolutional layers and 2 fully-connected layers. Firstly, pre-training is carried out, and millimeter wave holographic images of various standard dangerous goods after image pre-processing are trained on ImageNet for the first 20 convolutional layers +1 averaging pooling layer +1 full-connection layer of the YOLO network. Add 4 convolutional layers and 2 fully-connected layers initialized randomly on the 20 convolutional layers obtained by pre-training. At the time of detection, the human body millimeter wave image is divided into 10 × 10 grids, and each grid predicts 2 bounding boxes and confidence coefficients thereof, and 20 class probabilities. The Bbox information (x, y, w, h) is the deviation and width and height of the center position of the object relative to the grid position, the normalization processing is carried out, the final output probability of each unit grid prediction is defined during testing, and the formula (2):
Pr(Classi|Object)*Pr(Object)*IOUtruthpred＝Pr(Classi)*IOUtruthpred(2)
wherein: pr (Classi | Object) is the conditional probability that an Object exists in the cell and belongs to the ith class, Pr (Object) is the probability of whether an Object exists in the cell, Pr (Classi) is the probability that an Object belongs to the ith class in the cell, and IOUutrhpred is the cross-over ratio of 2 bounding boxes.
The trained YOLO network is directly placed in the automatic identification module 8, and when human body security inspection is carried out, the obtained real-time panoramic image is output through a one-time forward process of the network; then, whether the maximum class confidence of each predicted box exceeds a specified threshold is judged, if not, the box is abandoned, the class confidence of each box is obtained by multiplying the predicted class probability and the confidence, and the class confidence gives the probability of the class appearing in the box and the accuracy of the predicted box; and filtering the rest box by using non-maximum suppression, wherein the final box is the final detection result of the YOLO, the class corresponding to the maximum class confidence coefficient is the class to which the object belongs, and the system finally gives a safety prompt according to the probability.
Preferably, the step (e): the person 100 to be tested who smoothly passes through the security inspection leaves from the security inspection outlet 131; the person 100 to be tested who needs manual review leaves the review exit 132 and then performs manual review. Namely, when a question is prompted, the male and female inspectors can leave from the special exit and then respectively carry out reinspection by the male and female inspectors, so that the error is further reduced, and the accuracy of security inspection is improved; and the personnel who normally pass through the security check can leave by other exports, guarantee the security check smoothness nature, improve the traffic rate.
The terahertz wave imaging security inspection device can be also suitable for the field of terahertz wave imaging security inspection after the frequency of the output electromagnetic wave of the millimeter wave source 41 is changed.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A vertical elevator type millimeter wave security inspection system is characterized by comprising:
a control module;
the safety inspection cabin comprises a lift car, an inlet arranged on the lift car and an outlet arranged on the lift car, and a detection area for arranging a person to be detected is formed in the inner area of the lift car;
the shaft is matched with the lift car;
the mechanical driving device is controlled by the control module and is used for driving the lift car to do lifting motion on the shaft;
the linear array scanning unit comprises a main body arranged in the middle of the shaft, a plurality of millimeter wave sources arranged on the main body in an array mode and a plurality of millimeter wave detectors arranged on the main body in an array mode;
the signal acquisition processing module is used for receiving the detection signal of the millimeter wave detector and processing the detection signal;
the imaging display module is controlled by the control module and connected with the signal acquisition and processing module, performs image reconstruction on the information processed by the signal acquisition and processing module to synthesize a three-dimensional image, and performs differential display on different objects;
the automatic identification module is connected with the imaging display module, can acquire image data information displayed by the imaging display module, performs artificial intelligence operation on the image data information, and automatically performs forbidden articles judgment prompt.
2. The vertical elevator type millimeter wave security inspection system according to claim 1, further comprising a composite gate having an identification module.
3. The vertical elevator type millimeter wave security inspection system according to claim 2, wherein the security inspection cabin comprises two outlets, the two outlets being a security inspection outlet through which the person to be inspected who is qualified in security inspection passes and a re-inspection outlet through which the person to be inspected who is not qualified in security inspection passes.
4. The vertical elevator type millimeter wave security inspection system according to claim 3, wherein the millimeter wave sources and the millimeter wave detectors are arranged at intervals in a sparse array structure with a period of coprime, the number of the millimeter wave sources is N1, the number of the millimeter wave detectors is N2, the length of the array period is D, wherein N1 and N2 are coprime, the array element spacing of the millimeter wave sources is D/N1, the array element spacing of the millimeter wave detectors is D/N2, the sparsity a can be calculated according to the formula (1),
α＝2N1N2/(N1+N2) (1)。
5. the vertical elevator type millimeter wave security inspection system according to claim 4, wherein the frequency band of the millimeter wave source is 26.5GHz to 1000 GHz.
6. The vertical elevator type millimeter wave security inspection system according to claim 1, wherein the linear array scanning units are a plurality of linear array scanning units uniformly arranged along the circumferential direction of the hoistway.
7. A security inspection method using the vertical elevator type millimeter wave security inspection system according to any one of claims 1 to 6, comprising the steps of:
(a) a preparation stage: a person to be detected enters a detection area of the security inspection cabin and stands at the detection area;
(b) and (3) running scanning: the control module controls the mechanical driving device to drive the security inspection cabin to vertically run upwards, in the ascending process, the person to be inspected and the linear array scanning unit move relatively, millimeter waves emitted by a millimeter wave source of the linear array scanning unit scan the person to be inspected, and millimeter wave signals reflected or scattered by the person to be inspected are received by the millimeter wave detector; the signal acquisition processing module acquires and processes the millimeter wave signals received by the millimeter wave detector and transmits the processed information to the imaging display module;
(c) image synthesis: the imaging display module synthesizes all information processed by the signal acquisition processing module, and the information is spliced into panoramic images of the front side and the back side of a person to be detected, so that a three-dimensional image of the human body to be detected is synthesized by the imaging display module, and different objects are displayed in a distinguishing way;
(d) automatic identification: and carrying out artificial intelligence algorithm processing according to the obtained image, comparing the image with a standard image database of contraband, and giving out identification information and safety prompt through an automatic identification module.
8. The security inspection method of claim 7, further comprising step (e): the outlet of the security inspection cabin comprises a security inspection outlet for passing the qualified personnel to be detected in the security inspection and a re-inspection outlet for passing the unqualified personnel to be detected in the security inspection, and the personnel to be detected which smoothly pass through the security inspection leave from the security inspection outlet; the personnel to be tested needing manual reinspection leave from the reinspection outlet and then carry out manual reinspection.
9. The security inspection method according to claim 7 or 8, wherein in the step (c), the signal acquisition and processing module is used for processing the signals obtained by the linear array scanning unit by adopting a time domain back projection imaging algorithm.
10. The security inspection method according to claim 9, wherein in the step (d), the YOLO algorithm framework is adopted to perform artificial intelligence algorithm training and detection recognition processing on the panoramic image.
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| CN112415624B (en) * | 2020-11-25 | 2023-08-25 | 成都菲斯洛克电子技术有限公司 | Security protection detection system and detection method |
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