A non-aware pass-through real-time security inspection method

Abstract

This invention provides a non-intrusive, real-time security inspection method, comprising the following steps: S1, activating a video detector and a millimeter-wave security scanner; S2, the video detector transmits millimeter waves to the detection area, and the millimeter-wave security scanner receives the echo signals in real time and timestamps the echo signals; S3, when a person enters the detection area, it is determined whether the person meets the detection conditions. If yes, proceed to step S4; otherwise, return to step S2; S4, the video detector generates a trigger signal, and the millimeter-wave security scanner generates an imaging signal based on the trigger signal, and obtains two frames of images based on the echo signals; S5, the images are inspected to determine whether the person is carrying dangerous goods. This non-intrusive, real-time security inspection method, while handling a small amount of data, completes real-time data processing and non-intrusive security inspection, improving the efficiency of security equipment.

Description

Technical Field

[0001] This invention relates to the field of millimeter-wave security imaging technology, specifically to a non-intrusive, pass-through real-time security inspection method. Background Technology

[0002] With the increasing variety of dangerous goods, traditional security screening methods are no longer sufficient to meet the demands of the current security market. Traditional metal detectors can only detect prohibited metal items and are ineffective against plastic bombs and ceramic knives; while X-ray security equipment can detect all prohibited items, it poses a threat to human health and is not the optimal security screening method. Currently, millimeter-wave 3D imaging technology is an effective alternative to traditional security screening methods.

[0003] L3's cylindrical scanning 3D imaging system, RS's QPS 3D imaging system, and Smith's reflector antenna array imaging system are currently the main millimeter-wave 3D imaging systems on the market. Currently available millimeter-wave security inspection equipment is all cooperative, unsuitable for the high-throughput demands of public places for rapid, pass-through, and open-access security checks. To improve imaging speed without excessively increasing costs, sparse arrays such as MIMO (Multiple-Input Multiple-Output) imaging systems are typically used for signal acquisition. Even with this array configuration, the data processing volume for video imaging remains large, and traditional fast algorithms cannot handle the data sampled by sparse arrays, resulting in higher processing complexity and longer processing time. Therefore, invention CN11l158057A proposes using additional video sensors to determine the location of the person being inspected; when the person enters the channel, the system is triggered to operate and acquire data. However, even with this approach, the amount of data to be processed remains large, making video imaging difficult. Summary of the Invention

[0004] This invention aims to overcome the technical problems of large data volume, high real-time processing difficulty, and time delay in camera capture in the existing video imaging process. It provides a non-intrusive real-time security inspection method that completes real-time data processing and non-intrusive security inspection while handling a small amount of data, thereby improving the efficiency of security inspection equipment.

[0005] This invention provides a non-intrusive, real-time security inspection method, comprising the following steps:

[0006] S1. Activate the video detector and millimeter-wave security scanner;

[0007] S2. The video detector emits millimeter waves to the detection area, and the millimeter wave security detector receives the echo signals in real time and timestamps the echo signals.

[0008] S3. When the person being tested enters the testing area, determine whether the person being tested meets the testing conditions. If the condition is met, proceed to step S4; otherwise, return to step S2.

[0009] S4. The video detector generates a trigger signal, and the millimeter-wave security detector generates an imaging signal based on the trigger signal and obtains two frames of images based on the echo signal.

[0010] S5. Detect the image to determine whether the person being inspected is carrying dangerous goods.

[0011] The present invention provides a non-intrusive, real-time security inspection method, in which the millimeter-wave security scanner includes a front security scanner and a rear security scanner.

[0012] The non-intrusive, real-time security inspection method described in this invention, as a preferred embodiment, includes the following steps:

[0013] S1. Activate the video detector and millimeter-wave security scanner;

[0014] S2. The video detector emits millimeter waves to the detection area, and the millimeter wave security detector receives the echo signals in real time and timestamps the echo signals.

[0015] S3. When the person being inspected enters the detection area of ​​the front security scanner, determine whether the person being inspected is within the detection distance R0 of the millimeter-wave security scanner. If the determination is yes, proceed to step S4; otherwise, return to step S2.

[0016] S4, the moment t is when the distance between the feet of the person being inspected is at its maximum, as measured by the video detector. t The moment t is the maximum distance between the two arms b A trigger signal is generated, and the millimeter-wave security scanner obtains the optimal imaging time t based on the trigger signal delay time Δt. t -Δt and t b -Δt, processing the echo signal marked with the optimal imaging time of the millimeter-wave security scanner to obtain two frames of images;

[0017] S5. When the person being inspected enters the detection area of ​​the rear security scanner, repeat steps S3 to S4 to obtain two frames of the image.

[0018] S6. Detect the four frames of images obtained in steps S4 and S5 to determine whether the person being inspected is carrying dangerous goods.

[0019] In the non-intrusive real-time security inspection method described in this invention, as a preferred embodiment, the detection distance R0 of the millimeter-wave security scanner has a range of 0.5m < R0 < 0.9m.

[0020] In the non-intrusive pass-through real-time security inspection method described in this invention, as a preferred embodiment, the numerical range of the delay time Δt is: 250ms > Δt > 200ms.

[0021] The non-intrusive real-time security inspection method described in this invention, as a preferred embodiment, includes a millimeter-wave security scanner comprising a left-side security scanner and a right-side security scanner, wherein the distance h between the left-side and right-side security scanners is in the range of 1m < h < 2m.

[0022] The non-intrusive, real-time security inspection method described in this invention, as a preferred embodiment, includes the following steps:

[0023] S1. Activate the video detector and millimeter-wave security scanner;

[0024] S2. The video detector emits millimeter waves to the detection area, and the millimeter wave security detector receives the echo signals in real time and timestamps the echo signals.

[0025] S3. When the person being inspected enters the detection area, determine whether the person being inspected is in the millimeter-wave security scanner with the largest body projection area. If the determination is yes, proceed to step S4; otherwise, return to step S2.

[0026] S4, the moment t is when the video detector detects the largest projected area of ​​the person being inspected by the left-side security scanner. z And at the moment t when the projected area of ​​the person being inspected is the largest, as detected by the security scanner on the right. v A trigger signal is generated, and the millimeter-wave security scanner obtains the optimal imaging time t based on a delay Δt from the trigger signal. t -Δt and t b -Δt, processing the echo signal marked with the optimal imaging time of the millimeter-wave security scanner to obtain two frames of images;

[0027] S5. Detect the image to determine whether the person being inspected is carrying dangerous goods.

[0028] In a preferred embodiment of the non-intrusive real-time security inspection method described in this invention, after the millimeter-wave security scanner collects data, it pre-stores the echo data within the time interval Δt0. If a trigger signal is received, the echo data at time Δt before this time is processed. If no trigger signal is received, the echo data from time t to time t-Δt0 is retained, and the remaining echo data is discarded.

[0029] In the non-intrusive pass-through real-time security inspection method described in this invention, as a preferred embodiment, the delay time Δt0 has a numerical range of: Δt0 > 300ms.

[0030] The present invention has the following advantages:

[0031] (1) This invention completes real-time data processing and non-perceptible security checks under the premise of processing a small amount of data; by capturing the best detection state of the human body through a video camera, this part of the data is extracted from the sampled data and processed for imaging, thereby realizing the function of automatically triggering the security inspection imaging device.

[0032] (2) The concealed security inspection device used in this invention can be incorporated into existing facilities such as airport billboards and information screens, thereby increasing the concealment and experience of security inspection.

[0033] (3) The present invention adopts a real-time sampling and caching method. First, a portion of the data is pre-stored from the start of power-on. If no trigger signal is returned within 300ms, the data is discarded. If a trigger signal is returned after 300ms, the imaging detection process is performed 200ms ahead of this moment. After processing, the original data is discarded and the detection result is saved, which improves the detection efficiency. Attached Figure Description

[0034] Figure 1 A flowchart of a non-intrusive, pass-through real-time security inspection method;

[0035] Figure 2 This is a schematic diagram of the through-type millimeter-wave security scanner in Example 1;

[0036] Figure 3 This is a flowchart illustrating the use of the through-type millimeter-wave security scanner in Example 1.

[0037] Figure 4 This is a test result diagram of Example 1;

[0038] Figure 5 This is a schematic diagram of the through-type millimeter-wave security scanner in Example 2;

[0039] Figure 6 This is a flowchart illustrating the use of the through-type millimeter-wave security scanner in Example 2.

[0040] Figure 7 This is a test result diagram for Example 2. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] like Figure 1 As shown, a non-intrusive, pass-through real-time security check method includes the following steps:

[0043] S1. Activate the video detector and millimeter-wave security scanner;

[0044] S2. The video detector emits millimeter waves to the detection area. The millimeter wave security detector receives the echo signals in real time and timestamps the echo signals. After collecting data, the millimeter wave security detector stores the echo data within the time interval Δt0. If a trigger signal is received, the echo data before this time Δt is processed. If no trigger signal is received, the echo data from this time t to time t-Δt0 is retained, and the rest of the echo data is discarded.

[0045] S3. When the person being tested enters the testing area, determine whether the person being tested meets the testing conditions. If the condition is met, proceed to step S4; otherwise, return to step S2.

[0046] S4. The video detector generates a trigger signal, and the millimeter-wave security detector generates an imaging signal based on the trigger signal and obtains two frames of images based on the echo signal.

[0047] S5. Detect the image to determine whether the person being inspected is carrying dangerous goods.

[0048] Example 1

[0049] like Figure 2 As shown, the millimeter-wave security scanner includes a front security scanner and a rear security scanner. The distance h between the left and right security scanners has a range of 1m < h < 2m. The person being inspected passes through the front security scanner and the rear security scanner in sequence.

[0050] like Figure 3 As shown, a non-intrusive, pass-through real-time security check method includes the following steps:

[0051] S1. Activate the video detector and millimeter-wave security scanner;

[0052] S2. The video detector emits millimeter waves into the detection area. The millimeter-wave security detector receives the echo signals in real time and timestamps them. After collecting data, the millimeter-wave security detector stores the echo data within the time interval Δt0. If a trigger signal is received, the echo data before this time Δt is processed. If no trigger signal is received, the echo data from time t to time t-Δt0 is retained, and the remaining echo data is discarded. The value range of the delay time Δt0 is: Δt0 > 300ms.

[0053] S3. When the person being inspected enters the detection area of ​​the front security scanner, determine whether the person being inspected is within the detection distance R0 of the millimeter wave security scanner, 0.5m < R0 < 0.9m. If the determination is yes, proceed to step S4; otherwise, return to step S2.

[0054] S4. The video detector detects the moments tt when the front-to-back distance between the subject's feet is at its maximum and the moment tt when the distance between the subject's arms is at its maximum. bA trigger signal is generated, and the millimeter-wave security scanner obtains the optimal imaging time t based on the trigger signal delay time Δt. t -Δt and t b -Δt, the echo signal marked with the optimal imaging time by the millimeter-wave security scanner is processed to obtain two frames of images; the numerical range of the delay time Δt is: 250ms > Δt > 200ms;

[0055] The standards for video detection equipment to capture images are as follows:

[0056] 1) Take a picture when your hands are at their furthest apart or your feet are at their furthest apart:

[0057] 2) Take a picture once with your hands furthest apart and your right hand in front;

[0058] 3) Take a picture once with your hands furthest apart and your left hand in front;

[0059] 4) Take a picture once with the feet furthest apart and the left foot in front;

[0060] 5) Take a picture once with your feet furthest apart and your right foot in front;

[0061] S5. When the person being inspected enters the detection area of ​​the rear security scanner, repeat steps S3 to S4 to obtain two frames of the image.

[0062] S6. Perform detection on the four frames of images obtained in steps S4 and S5. The detection results are shown in the diagram below. Figure 4 As shown, this is used to determine whether the person being inspected is carrying dangerous goods.

[0063] Example 2

[0064] like Figure 5 As shown, the millimeter-wave security scanner includes a left-side security scanner and a right-side security scanner. The distance h between the left-side and right-side security scanners has a range of 1m < h < 2m. The person being inspected passes through both the left-side and right-side security scanners simultaneously.

[0065] like Figure 6 As shown, a non-intrusive, pass-through real-time security inspection method, as a preferred approach, includes the following steps:

[0066] S1. Activate the video detector and millimeter-wave security scanner;

[0067] S2. The video detector emits millimeter waves into the detection area. The millimeter-wave security detector receives the echo signals in real time and timestamps them. After collecting data, the millimeter-wave security detector stores the echo data within the time interval Δt0. If a trigger signal is received, the echo data before this time Δt is processed. If no trigger signal is received, the echo data from time t to time t-Δt0 is retained, and the remaining echo data is discarded. The value range of the delay time Δt0 is: Δt0 > 300ms.

[0068] S3. When the person being inspected enters the detection area, determine whether the person being inspected is in the millimeter-wave security scanner with the largest body projection area. If the determination is yes, proceed to step S4; otherwise, return to step S2.

[0069] S4, the moment t is when the video detector detects the largest projected area of ​​the person being inspected by the left-side security scanner. z And at the moment t when the projected area of ​​the person being inspected is the largest, as detected by the security scanner on the right. v A trigger signal is generated, and the millimeter-wave security scanner obtains the optimal imaging time t based on a delay Δt from the trigger signal. t -Δt and t b -Δt, the echo signal marked with the optimal imaging time by the millimeter-wave security scanner is processed to obtain two frames of images; the numerical range of the delay time Δt is: 250ms > Δt > 200ms;

[0070] S5. Detect the image to determine whether the person being inspected is carrying dangerous goods.

[0071] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A non-intrusive, pass-through real-time security inspection method, characterized in that: Includes the following steps: S1. Activate the video detector and millimeter-wave security scanner; S2. The video detector emits millimeter waves to the detection area, and the millimeter wave security detector receives the echo signals in real time and timestamps the echo signals. S3. When the subject enters the detection area, determine whether the subject meets the detection conditions. If the determination is yes, proceed to step S4; if the determination is no, return to step S2. S4. The video detector generates a trigger signal, the millimeter-wave security detector generates an imaging signal based on the trigger signal, and obtains two frames of images based on the echo signal; S5. Detect the image to determine whether the person being inspected is carrying dangerous goods; When the millimeter-wave security scanner includes a front-facing security scanner and a rear-facing security scanner, the non-intrusive through-type real-time security inspection method specifically includes the following steps: A1. Start the video detector and the millimeter-wave security inspection device; A2. The video detector emits millimeter waves to the detection area, and the millimeter wave security detector receives the echo signals in real time and timestamps the echo signals. A3. When the person being inspected enters the detection area of ​​the front security scanner, determine whether the person being inspected is within the detection distance R0 of the millimeter-wave security scanner. If the determination is yes, proceed to step A4; otherwise, return to step A2. A4. The video detector detects the moment t when the front-to-back distance between the feet of the person being inspected is at its maximum. t The moment t is the maximum distance between the two arms b A trigger signal is generated in time, and the millimeter-wave security scanner generates a trigger signal based on the delay time of the trigger signal. To obtain the optimal imaging time t t - and t b - The millimeter-wave security scanner processes the echo signal marked with the optimal imaging time to obtain two frames of images. A5. When the person being inspected enters the detection area of ​​the rear security scanner, repeat steps A3 to A4 to obtain two frames of the image; A6. Detect the four frames of images obtained in steps A4 and A5 to determine whether the person being inspected is carrying dangerous goods.

2. The non-intrusive, real-time security inspection method according to claim 1, characterized in that: The detection distance R0 of the millimeter-wave security scanner has the following range: .

3. The non-intrusive, real-time security inspection method according to claim 1, characterized in that: The delay time The numerical range is: 250ms> >200ms.

4. The non-intrusive, real-time security inspection method according to claim 1, characterized in that: When the millimeter-wave security scanner includes a left-side security scanner and a right-side security scanner, the numerical range of the distance h between the left-side security scanner and the right-side security scanner is: ; The non-intrusive, real-time security check method specifically includes the following steps: B1. Start the video detector and the millimeter-wave security inspection device; B2. The video detector emits millimeter waves to the detection area, and the millimeter wave security detector receives the echo signals in real time and timestamps the echo signals. B3. When the person being inspected enters the detection area, determine whether the person being inspected is in the millimeter-wave security scanner with the largest body projection area. If the determination is yes, proceed to step B4; otherwise, return to step B2. B4. The video detector detects the moment t when the projected area of ​​the inspected person's body is at its largest, as detected by the security scanner on the left. z And at the moment t when the projected area of ​​the inspected person's body is largest detected by the security scanner on the right. v A trigger signal is generated, and the millimeter-wave security scanner delays according to the trigger signal. To obtain the optimal imaging time t t - and t b - The millimeter-wave security scanner processes the echo signal marked with the optimal imaging time to obtain two frames of images. B5. Detect the image to determine whether the person being inspected is carrying dangerous goods.

5. The non-intrusive, pass-through real-time security inspection method according to claim 4, characterized in that: The delay time The numerical range is: 250ms> >200ms.

6. A non-intrusive, real-time security inspection method according to any one of claims 1 to 5, characterized in that: The millimeter-wave security scanner collects data and then stores it for a pre-time period. If the trigger signal is received, the echo data within the time interval is processed up to this time. If the trigger signal is not received at time t, the echo data from time t to time t- is retained. The echo data at the specified time is discarded, and the rest of the echo data is discarded.

7. The non-intrusive, pass-through real-time security inspection method according to claim 6, characterized in that: The delay time The numerical range is: >300ms.

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