Millimeter wave security inspection system and method for single-point scanning

Abstract

The present invention relates to the field of security inspection technology, and in particular discloses a millimeter wave security inspection system and method for single-point scanning, comprising a frame, a three-prism metal reflective rotating mirror, a single-point scanning module located directly above the three-prism metal reflective rotating mirror, a signal acquisition and processing module, an imaging display module connected to the signal acquisition and processing module, an automatic identification module connected to the imaging display module, a scanning drive mechanism capable of driving the single-point scanning module to move, and a rotating drive mechanism capable of driving the three-prism metal reflective rotating mirror to rotate; the three-prism metal reflective rotating mirror can be rotatably connected to the frame; the single-point scanning module can be movably connected to the frame along the length direction of the three-prism metal reflective rotating mirror; the single-point scanning module comprises a millimeter wave source and a millimeter wave detector capable of emitting millimeter waves to the three-prism metal reflective rotating mirror. The present invention adopts the principle of single-point scanning and synthetic aperture holographic imaging, simplifies mechanical and electronic circuits, and reduces costs; the open detection area space improves the safety and comfort of security inspection.

Description

Technical Field

[0001] The present invention relates to the technical field of security inspection, and in particular to a single-point scanning millimeter wave security inspection system and method. Background Art

[0002] With the sharp increase in the flow of people in large public places and terrorist activities, the demand for human body security inspection is growing. However, the security inspection methods widely used for human bodies in public places such as airports and stations are mainly metal detectors, ion spectrometers and X-ray detectors. Metal detectors can only detect metal objects carried by the human body, ion spectrometers are mainly used to detect whether the human body is carrying explosives, and X-ray detectors are mainly used to detect carry-on luggage and other items, but cannot detect the human body. Therefore, the research on new safe, reliable and fast human body security inspection technologies has received widespread attention. Among them, millimeter wave and terahertz wave technology has gradually become a research hotspot in recent years and has been applied to the field of human body security inspection. Millimeter wave and terahertz wave have low photon energy, are almost harmless to the human body, have good penetration into materials such as textiles and leather, and are easy to obtain higher spatial resolution.

[0003] In response to this application trend, the invention patent application with application number 201710778390.9 and titled "Active terahertz security inspection imaging method and system" proposes a method and system for security inspection using terahertz waves. The patent adopts a mode of actively emitting terahertz radiation with a terahertz source, scanning a one-dimensional band-shaped focused beam, and receiving a linear array terahertz detector to complete the irradiation and scanning of the entire target plane, thereby achieving the purpose of imaging and inspecting the target. However, the method and system require a large number of detectors. Since the current terahertz devices are expensive, the system cost is extremely high and difficult to promote. For this reason, the invention patent application with application number 201510376894.9 and titled "Terahertz human body security inspection system and security inspection method" proposes a method and system for terahertz wave security inspection using a drum-type multi-faceted reflective rotating mirror for single-point scanning. The patent adopts a single-point scanning mode, and completes the irradiation and scanning of the entire target plane by focusing imaging with a reflective rotating mirror and multiple concave mirrors, thereby achieving the purpose of imaging and inspecting the target. Although the number of detection modules is reduced, the method and system also have obvious disadvantages: the use of optical focusing imaging greatly increases the complexity of the system in terms of optical mechanics and electronic circuits, and the detection accuracy is not high. Therefore, it is not very practical. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a single-point scanning millimeter wave security inspection system and method, which has a simple structure, high detection accuracy and low cost.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a single-point scanning millimeter wave security inspection system, comprising a frame;

[0006] A three-prism metal reflective rotating mirror capable of reflecting millimeter waves, wherein the three-prism metal reflective rotating mirror is rotatably connected to a frame;

[0007] A single-point scanning module is located directly above the three-prism metal reflective rotating mirror, and the single-point scanning module can be movably connected to the frame along the length direction of the three-prism metal reflective rotating mirror; the single-point scanning module includes a millimeter wave source that can emit millimeter waves to the three-prism metal reflective rotating mirror and a millimeter wave detector that receives millimeter wave reflection signals;

[0008] A detection area for the person to be tested to stand, the detection area is located on the side of the triangular metal reflective rotating mirror and can receive the millimeter wave reflected from the triangular metal reflective rotating mirror;

[0009] The signal acquisition and processing module is connected to the millimeter wave detector to collect and process the signal transmitted by the millimeter wave detector;

[0010] The imaging display module is connected to the signal acquisition and processing module, and reconstructs the processed signal into a three-dimensional image, and displays different objects differently;

[0011] The automatic identification module is connected to the imaging display module and performs artificial intelligence calculations on the acquired image data to automatically identify prohibited items;

[0012] A scanning drive mechanism connected to the single-point scanning module and capable of driving the single-point scanning module to move;

[0013] A rotation driving mechanism connected to the three-prism metal reflective rotating mirror and capable of driving the three-prism metal reflective rotating mirror to rotate;

[0014] A control module connected to the scanning drive mechanism and the rotating drive mechanism, wherein the control module is connected to the imaging display module;

[0015] The control module can conveniently control the coordinated work of the above modules. The imaging display module can display the final synthesized panoramic image for different objects to meet different work requirements. The automatic identification module also provides an artificial intelligence algorithm to compare the detection image with the contraband image database, automatically identify and prompt its dangerousness, and prevent omissions in manual detection.

[0016] When in use, only a single-point scanning module is needed to move along the frame, and then it can be moved to carry out a comprehensive scan of the person to be tested. It requires few parts, is flexible to use, and is highly practical. The method of high-speed rotation of the three-prism metal reflective mirror to reflect the millimeter wave finally completes the three-dimensional holographic scanning imaging of the millimeter wave. Through the principle of synthetic aperture imaging, while ensuring the accuracy of the scanning imaging, the required scanning parts are greatly reduced. At the same time, the detection area presents development space, which greatly improves the safety and comfort of the target to be inspected.

[0017] Furthermore, the scanning drive mechanism includes a lead screw extending along the length direction of the triangular metal reflective rotating mirror, a nut sleeved outside the lead screw, and a first motor connected to the lead screw and capable of driving the lead screw to rotate and drive the nut to move; the lead screw is rotatably connected to the frame; and the single-point scanning module is connected to the nut. The design is simple in structure and has good use effect.

[0018] Furthermore, the rotation drive mechanism comprises a rotation shaft rotatably connected to the frame, and a second motor connected to the rotation shaft and capable of driving the rotation shaft to rotate. The design has a simple structure and good use effect.

[0019] Furthermore, a metal detection plate for the person to be tested to stand is provided in the detection area, and the metal detection plate is connected to the automatic identification module.

[0020] Furthermore, a wave absorbing plate is provided on the side of the detection area opposite to the triangular metal reflective rotating mirror to provide a good grayscale background image for subsequent detection imaging, so as to facilitate the subsequent background processing.

[0021] Furthermore, there are two detection areas, which are respectively located on both sides of the three-prism metal reflective rotating mirror. The three-prism metal reflective rotating mirror can simultaneously detect the persons to be detected on both sides thereof, and the working efficiency is high.

[0022] In addition, the present invention also provides a single-point scanning millimeter wave security inspection method, comprising the following steps:

[0023] (a) Preparation stage: Start the system and guide the test subjects to stand in the test area. According to the prompts, they should face the three-prism metal reflective mirror and keep a fixed posture;

[0024] (b) Scanning and imaging: The control module controls the movement of the rotating drive mechanism to drive the three-prism metal reflective mirror to rotate at high speed. At the same time, the control module controls the scanning drive mechanism directly above the three-prism metal reflective mirror to drive the single-point scanning module to move along the length direction of the three-prism metal reflective mirror. The millimeter wave emitted by the millimeter wave source on the single-point scanning module is reflected by the three-prism metal reflective mirror to scan the person to be tested, and then returns to the millimeter wave detector of the single-point scanning module, thereby realizing millimeter wave scanning and imaging of the whole body of the human body;

[0025] (c) Image synthesis: The millimeter wave signals received by the millimeter wave detector are collected and processed by the signal acquisition and processing module, and then all the signals are synthesized according to the principle of synthetic aperture holographic imaging by the imaging display module to form a panoramic frontal image;

[0026] (d) Turn detection: The person to be tested turns his back to the three-prism metal reflective mirror and repeats the above steps (b) and (c) to complete the panoramic back image detection. The imaging display module synthesizes the three-dimensional image of the person to be tested and displays it differently for different objects;

[0027] (e) Automatic identification: The acquired image is processed by artificial intelligence algorithm and compared with the standard image database of prohibited items. The automatic identification module provides identification information and safety tips.

[0028] The above method can effectively complete the security inspection of human body in public places, and under the premise of minimizing the false detection rate and missed detection rate, it well protects the dignity of the person to be tested. In addition, the detection cost is low, the security inspection information is collected comprehensively, and the detection accuracy is high. It is particularly suitable for promotion in various security inspection application scenarios.

[0029] Furthermore, in the step (b), when two persons to be tested are located on both sides of the three-prism metal reflective rotating mirror and tested simultaneously, the imaging display module can automatically determine the ownership of the test signal by the angle position of the three-prism metal reflective rotating mirror.

[0030] In summary, the present invention only needs a single-point scanning module, and scans the persons to be tested on both sides by rotating the three-prism metal reflective rotating mirror, so the detection accuracy is high and the working efficiency is high; and the structure is simple, the manufacturing cost is low, and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a usage status diagram of Example 1 of the present invention;

[0032] Figure 2 This is a partial schematic diagram of Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0034] Figure 4 It is a partial enlarged view of Example 1 of the present invention;

[0035] Among them, there are a frame 1; a single-point scanning module 2, a millimeter wave source 21, a millimeter wave detector 22; a three-prism metal reflective rotating mirror 3; a metal detection plate 41, an absorbing plate 42; a signal acquisition and processing module 5; an imaging display module 6; an automatic identification module 7; a scanning drive mechanism 8, a screw rod 81, a nut 82, and a first motor 83; a rotating drive mechanism 9, a rotating shaft 91, and a second motor 92; a control module 10; and a person to be tested 100. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Example 1

[0037] like Figure 1-4 As shown, a single-point scanning millimeter wave security inspection system includes a frame 1, a single-point scanning module 2, a three-prism metal reflective rotating mirror 3, a detection area, a signal acquisition and processing module 5, an imaging display module 6, an automatic identification module 7, a scanning drive mechanism 8, a rotation drive mechanism 9 and a control module 10.

[0038] Specifically, the triangular metal reflective rotating mirror 3 can reflect millimeter waves, wherein the millimeter waves can also be terahertz waves. The triangular metal reflective rotating mirror 3 can be rotatably connected to the frame 1. The single-point scanning module 2 is located directly above the triangular metal reflective rotating mirror 3, and the single-point scanning module 2 is movably connected to the frame 1, and the moving direction of the single-point scanning module 2 is along the length direction of the triangular metal reflective rotating mirror 3. The single-point scanning module 2 includes a millimeter wave source 21 and a millimeter wave detector 22, wherein the millimeter wave source 21 can emit millimeter waves to the triangular metal reflective rotating mirror 3, and the millimeter wave detector 22 can receive millimeter wave reflection signals. In this example, the millimeter wave source 21 is a millimeter wave source that actively emits millimeter waves, and the millimeter wave detector 22 is a millimeter wave detector 22 that receives millimeter wave signals. The millimeter waves emitted by the millimeter wave source 21 are reflected or scattered on the human body to be inspected.

[0039] The detection area is used for the person to be tested 100 to stand. The detection area is located on the side of the triangular metal reflective rotating mirror 3 . The person to be tested 100 in the detection area can receive the millimeter wave reflected from the triangular metal reflective rotating mirror 3 .

[0040] The signal acquisition and processing module 5 is connected to the millimeter wave detector 22 , and the signal acquisition and processing module 5 acquires and processes the signal transmitted by the millimeter wave detector 22 .

[0041] The imaging display module 6 is connected to the signal acquisition and processing module 5. The imaging display module 6 reconstructs the processed signal to synthesize a three-dimensional image, and displays it differently for different objects. The automatic recognition module 7 is connected to the imaging display module 6. The automatic recognition module 7 performs artificial intelligence calculations on the acquired image data and automatically performs judgment prompts for prohibited items. That is, in this example, the signal detection is completed by the millimeter wave detector, and the signal acquisition and processing module 5 processes the signal and then converts it into a segmented local image signal that can be processed by subsequent algorithms. The imaging display module 6 synthesizes the local images at different times formed by the above-mentioned signal acquisition and processing module 5 to obtain a complete target image.

[0042] The imaging display module 6 displays the synthesized panoramic image. Preferably, two display outputs can be used, one of which is output to the security personnel console, including all imaging information, so that the security personnel can view the imaging information of the inspected person in all directions and perform multi-angle analysis and processing. The other is output to an external display device for viewing and display in a public environment. Considering the protection of personal privacy, this signal is simulated and displayed using cartoon characters, and only regional prompts are processed for relevant detection objects.

[0043] The automatic identification module 7 is used to perform artificial intelligence calculations on the synthesized panoramic image, and then compare it with the prohibited items image database to automatically identify and prompt its dangerousness, thereby preventing omissions in manual detection and ensuring that there is no room for error. If there are difficulties in automatic identification of individual items, the security inspector can be prompted to conduct manual re-inspection.

[0044] The scanning drive mechanism 8 is connected to the single-point scanning module 2, and the scanning drive mechanism 8 can drive the single-point scanning module 2 to move. The rotation drive mechanism 9 is connected to the three-prism metal reflective rotating mirror 3, and the rotation drive mechanism 9 can drive the three-prism metal reflective rotating mirror 3 to rotate. The control module 10 is connected to the scanning drive mechanism 8 and the rotation drive mechanism 9, and the control module 10 is connected to the imaging display module 6.

[0045] The structure of the scanning drive mechanism 8 can be designed as required, such as a cylinder. However, in the present embodiment, the scanning drive mechanism 8 includes a screw 81, a nut 82 and a first motor 83. The screw 81 extends along the length direction of the triangular metal reflective mirror 3, and the screw 81 is rotatably connected to the frame 1. The nut 82 is sleeved outside the screw 81, and the nut is threadedly connected to the screw 81. The first motor 83 is connected to the screw 81 and can drive the screw 81 to rotate around the frame 1, thereby driving the nut 82 to move along the screw 81. The single-point scanning module 2 is connected to the nut 82, and when the nut moves, it can also drive the single-point scanning module 2 to move together.

[0046] Similarly, the structure of the rotating drive mechanism 9 can be designed as needed. For example, the rotating drive mechanism 9 includes a rotating shaft 91 and a second motor 92. The rotating shaft 91 can be rotatably connected to the frame 1. The second motor 92 is connected to the rotating shaft 91 and can drive the rotating shaft 91 to rotate around the frame.

[0047] In order to avoid scanning loopholes, a metal detection plate 41 is provided in the detection area, and the metal detection plate 41 is used for the person to be detected 100 to stand, and the metal detection plate 41 is connected to the automatic identification module 7. The detection result of the metal detection plate 41 can also be directly connected to the security inspection server, and the metal detection situation of the sole of the foot can be automatically prompted.

[0048] Preferably, an absorbing plate 42 is provided on the side of the detection area opposite to the triangular metal reflective rotating mirror 3, and the absorbing plate 42 provides a good grayscale background image for subsequent detection imaging. Reasonable placement of the absorbing plate 42 can provide a good imaging background and lay the foundation for subsequent image processing.

[0049] In order to improve work efficiency, there are two detection areas, which are respectively located on both sides of the triangular metal reflective mirror 3. The millimeter wave can also be a terahertz wave.

[0050] In this example, the second motor 92 in the rotating drive mechanism 9 drives the rotating shaft 91 to rotate at high speed, driving the three-prism metal reflective mirror 3 to rotate at high speed; at the same time, the first motor 83 drives the screw 81 to move horizontally, thereby driving the single-point scanning module 2 above to generate a linear motion trajectory for scanning. Example 2

[0051] This embodiment is a method used in conjunction with Embodiment 1, a single-point scanning millimeter wave security inspection method, and in this embodiment, includes the following steps:

[0052] (a) Preparation stage: Start the system and guide the persons to be tested to stand on the detection area, that is, guide the persons to be tested to stand on the metal detection plate 41. According to the prompt, the persons to be tested should face the three-prism metal reflective rotating mirror 3 and keep a fixed posture.

[0053] In this step, the person to be inspected needs to raise both hands and expose the whole body, especially the armpits, to ensure that the inspection area is complete.

[0054] (b) Scanning and imaging: The control module 10 controls the rotation drive mechanism 9 to move, and the rotation drive mechanism 9 drives the three-prism metal reflective rotating mirror 3 to rotate at high speed. At the same time, the control module 10 controls the scanning drive mechanism 8 directly above the three-prism metal reflective rotating mirror 3 to drive the single-point scanning module 2 to move along the length direction of the three-prism metal reflective rotating mirror 3. The millimeter wave emitted by the millimeter wave source 21 on the single-point scanning module 2 is reflected by the three-prism metal reflective rotating mirror 3 and scans the person to be tested, and then the millimeter wave returns to the millimeter wave detector 22 of the single-point scanning module 2, realizing millimeter wave scanning and imaging of the whole body of the human body.

[0055] In this step, in order to improve work efficiency, two persons to be tested can be measured simultaneously, so that the two persons to be tested are located on both sides of the three-prism metal reflective rotating mirror 3 and tested simultaneously. At this time, the imaging display module 6 can automatically determine the ownership of the detection signal by the angle position of the three-prism metal reflective rotating mirror 3. In addition, the angle of the three-prism metal reflective rotating mirror 3 and the coordinates of the millimeter wave detector 22 on the screw rod 81 can also be automatically recorded in real time to establish a mapping equation for the image synthesis of the detected area at different times. At the same time, by recording the angle of the reflective rotating mirror, the signals of the object to be tested 100 reflected or scattered from different directions can be automatically determined.

[0056] (c) Image synthesis: The millimeter wave signals received by the millimeter wave detector 22 are collected and processed by the signal collection and processing module 5, and then all the signals are synthesized by the imaging display module 6 to form a panoramic frontal image.

[0057] In the step (c), the imaging display module 6 performs algorithm focusing imaging through the principle of synthetic aperture radar (SAR) holographic imaging. Considering the requirements of real-time imaging, the signal obtained by the single-point scanning module 2 is processed by the signal acquisition and processing module 5, and the time domain backprojection (BP) imaging algorithm is used to directly project the original data onto the final imaging plane without positioning calculation. The obtained image is the scattering intensity of the real three-dimensional space position, which is convenient for subsequent synthesis operations. Preferably, a block BP imaging algorithm can be used to reduce the amount of algorithm calculation, and combined with GPU parallel computing technology, real-time imaging can be achieved.

[0058] (d) Turn detection: After completing the above steps, the person to be tested turns his back to the three-prism metal reflective mirror 3 and repeats the above steps (b) and (c) to complete the panoramic back image detection. The imaging display module 6 synthesizes a three-dimensional image of the person to be tested and displays it differently for different objects.

[0059] (e) Automatic identification: The obtained image is processed by artificial intelligence algorithm and compared with the standard image database of contraband. The automatic identification module 7 provides identification information and safety tips.

[0060] In the step (e), the deep learning algorithm preset in the automatic recognition module 7 is used to perform intelligent judgment and safety prompts for special objects in the panoramic image. In this example, a framework based on the YOLO (You Only Look Onec) algorithm is used. A convolutional network is used to extract features, and a fully connected layer is used to obtain prediction values. The network structure includes 24 convolutional layers and 2 fully connected layers. First, pre-training is performed to train the first 20 convolutional layers + 1 average pooling layer + 1 fully connected layer of the YOLO network on ImageNet for the millimeter wave holographic images of various standard dangerous goods that have undergone image preprocessing. Add 4 randomly initialized convolutional layers and 2 fully connected layers on top of the 20 convolutional layers obtained by pre-training. During detection, the millimeter wave image of the human body is divided into 10*10 grids, and each grid predicts 2 bounding boxes and their confidences, as well as 20 category probabilities. Bbox information (x, y, w, h) is the offset and width and height of the center position of the object relative to the grid position. It is normalized. When testing, the final output probability predicted by each cell is defined as:

[0061] (1)

[0062] The trained YOLO network is directly placed in the automatic recognition module 7. When performing human body security inspection, the real-time panoramic image is first output through a forward process of the network; then, it is judged whether the maximum category confidence of each predicted box exceeds the specified threshold. If not, the box is discarded. The category confidence of each box is obtained by multiplying the predicted category probability and confidence. The category confidence gives the probability of the category appearing in the box and the accuracy of the predicted box; the remaining boxes are filtered using non-maximal suppression, and the final box is the final detection result of YOLO. The category corresponding to its maximum category confidence is the category to which the object belongs. The system finally gives a safety prompt based on the probability.

[0063] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A single-point scanning millimeter wave security inspection system, characterized by: including a frame (1); A three-prism metal reflective rotating mirror (3) capable of reflecting millimeter waves, wherein the three-prism metal reflective rotating mirror (3) is rotatably connected to the frame (1); A single-point scanning module (2) is located directly above the triangular metal reflective rotating mirror (3), and the single-point scanning module (2) is movably connected to the frame (1) along the length direction of the triangular metal reflective rotating mirror (3); the single-point scanning module (2) comprises a millimeter wave source (21) capable of emitting millimeter waves toward the triangular metal reflective rotating mirror (3), and a millimeter wave detector (22) for receiving millimeter wave reflection signals; A detection area for a person to be detected (100) to stand, the detection area being located on a side of the triangular metal reflective rotating mirror (3) and capable of receiving millimeter waves reflected from the triangular metal reflective rotating mirror (3); A signal acquisition and processing module (5) connected to the millimeter wave detector (22) to acquire and process the signal transmitted by the millimeter wave detector (22); An imaging display module (6) is connected to the signal acquisition and processing module (5), and performs image reconstruction on the processed signal to synthesize a three-dimensional image, and displays different objects differently; The automatic identification module (7) is connected to the imaging display module (6) and performs artificial intelligence calculations on the acquired image data to automatically determine and prompt prohibited items; A scanning drive mechanism (8) connected to the single-point scanning module (2) and capable of driving the single-point scanning module (2) to move; A rotation drive mechanism (9) connected to the three-prism metal reflective rotating mirror (3) and capable of driving the three-prism metal reflective rotating mirror (3) to rotate; A control module (10) connected to the scanning drive mechanism (8) and the rotation drive mechanism (9), wherein the control module (10) is connected to the imaging display module (6).

2. The single-point scanning millimeter wave security inspection system according to claim 1 is characterized in that: The scanning drive mechanism (8) comprises a lead screw (81) extending along the length direction of the triangular metal reflective mirror (3), a nut (82) sleeved outside the lead screw (81), and a first motor (83) connected to the lead screw (81) and capable of driving the lead screw (81) to rotate and drive the nut (82) to move; the lead screw (81) is rotatably connected to the frame (1); and the single-point scanning module (2) is connected to the nut (82).

3. The single-point scanning millimeter wave security inspection system according to claim 1, characterized in that: The rotary drive mechanism (9) comprises a rotary shaft (91) rotatably connected to the frame (1), and a second motor (92) connected to the rotary shaft (91) and capable of driving the rotary shaft (91) to rotate.

4. The single-point scanning millimeter wave security inspection system according to claim 1, characterized in that: A metal detection plate (41) for the person to be detected (100) to stand is provided in the detection area, and the metal detection plate (41) is connected to the automatic identification module (7).

5. The single-point scanning millimeter wave security inspection system according to claim 1, characterized in that: A wave absorbing plate (42) is provided on the side of the detection area opposite to the triangular metal reflective rotating mirror (3) to provide a good grayscale background image for subsequent detection imaging.

6. The single-point scanning millimeter wave security inspection system according to claim 1, characterized in that: There are two detection areas, which are respectively located on two sides of the three-prism metal reflective rotating mirror (3).

7. The single-point scanning millimeter wave security inspection system according to claim 1, characterized in that: The frequency band of the millimeter wave is: 26.5GHz-1000GHz.

8. A millimeter wave security inspection method for single-point scanning, comprising the following steps: (a) Preparation stage: start the system, guide the persons to be tested (100) to stand in the testing area, and face the three-prism metal reflective rotating mirror (3) according to the prompts and keep a fixed posture; (b) Scanning and imaging: The control module (10) controls the movement of the rotation drive mechanism (9) to drive the three-prism metal reflective rotating mirror (3) to rotate at a high speed. At the same time, the control module (10) controls the scanning drive mechanism (8) directly above the three-prism metal reflective rotating mirror (3) to drive the single-point scanning module (2) to move along the length direction of the three-prism metal reflective rotating mirror (3). The millimeter wave emitted by the millimeter wave source (21) on the single-point scanning module (2) is reflected by the three-prism metal reflective rotating mirror (3) and scans the person to be tested (100). Then, the millimeter wave returns to the millimeter wave detector (22) of the single-point scanning module (2), thereby realizing millimeter wave scanning and imaging of the whole body of the human body; (c) Image synthesis: The millimeter wave signals received by the millimeter wave detector (22) are collected and processed by the signal collection and processing module (5), and then all the signals are synthesized according to the principle of synthetic aperture holographic imaging by the imaging display module (6) to form a panoramic frontal image; (d) Turning detection: the person to be tested (100) turns his back to the three-prism metal reflective rotating mirror (3) and repeats the above steps (b) and (c) to complete the panoramic back image detection. The imaging display module (6) synthesizes a three-dimensional image of the person to be tested and displays it differently for different objects; (e) Automatic identification: The obtained image is processed by artificial intelligence algorithm and compared with the standard image database of contraband. The automatic identification module (7) provides identification information and safety tips.

9. The single-point scanning millimeter wave security inspection method according to claim 8, characterized in that: In the step (b), when two persons to be tested (100) are located on both sides of the three-prism metal reflective rotating mirror (3) and tested simultaneously, the imaging display module (6) automatically determines the attribution of the detection signal through the angular position of the three-prism metal reflective rotating mirror (3).

10. The single-point scanning millimeter wave security inspection method according to claim 8, characterized in that: In the step (e), the YOLO algorithm framework is used to perform artificial intelligence algorithm training and detection and recognition processing on the panoramic image.

Images