A system and equipment for channel-type terahertz human body security inspection

Abstract

The present invention relates to the field of terahertz measurement technology, and discloses a system and equipment for channel-type terahertz human body security inspection, including a guide path module, the guide path module includes establishing a Z-shaped channel for inspected persons to pass through, and using a counter to count and record the number of people passing through, and triggering a single security inspection process each time a record is made; a human body detection module, the human body detection module includes utilizing the turning action of the inspected person when passing through the Z-shaped channel, and using two terahertz imaging detection sources to perform active terahertz wave scanning on the inspected person before and after turning around. The present invention performs a secondary judgment on the inspected items in combination with an interception threshold for suspected contraband with significant differences in terahertz imaging data at different angles and distances, and the interception threshold can be dynamically adjusted according to the similarity between the inspected items and the contraband and the degree of harm, so as to ensure effective identification and interception of contraband.

Description

Technical Field

[0001] The present invention relates to the technical field of terahertz measurement, and in particular to a system and equipment for channel-type terahertz human body security inspection. Background Art

[0002] Terahertz refers to electromagnetic radiation with a frequency range of 0.1 to 10 THz (wavelength of 3000 to 30 microns), and its band is located in a fairly wide range of electromagnetic radiation between microwaves and infrared light. The terahertz frequency band, due to its inherent frequency characteristics, is a very important spectrum in condensed matter physics research because it contains many important energy levels that determine material properties. The photon energy of terahertz light is only meV (millielectronvolts), which is completely harmless to the human body. It is a green band that can penetrate clothing and realize active imaging detection of the human body.

[0003] As for the current security inspection methods, the traditional use of metal detectors to conduct security inspections on the human body can only check specific metal objects, with a high false alarm rate. The most traditional body search method is easy to infringe on personal privacy and has high labor costs, and security inspections are time-consuming and labor-intensive. Existing terahertz security inspection equipment mostly uses passive detection, which completely relies on the weak terahertz signals spontaneously radiated by the human body or objects, and completes terahertz security inspections through the weak signal detection principle of pure detectors, resulting in poor terahertz imaging resolution and contrast, which cannot meet the image recognition requirements of accurate security inspections. At the same time, when the person being inspected passes the security inspection normally without stopping, the terahertz imaging image of the traditional passive terahertz detection cannot cover the entire body of the person being inspected, which also increases the time required for security inspections.

[0004] To this end, the present invention provides a channel-type terahertz human body security inspection system and equipment. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a channel-type terahertz human body security inspection system and equipment, so that an active terahertz detection light source can be used to perform security checks on personnel, and by covering the entire body of the personnel and providing more accurate detection data, the clarity of terahertz imaging can be increased, and the efficiency and accuracy of security checks can be improved.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a channel-type terahertz human body security inspection system, comprising:

[0007] A guidance path module, wherein the guidance path module includes establishing a Z-shaped channel for the inspected persons to pass through, and using a counter to count and record the number of people passing through, and each time a record is made, a single security inspection process is triggered;

[0008] A human body detection module, wherein the human body detection module utilizes the turning action of the inspected person when passing through the Z-shaped channel, and uses two terahertz imaging detection sources to actively scan the inspected person with terahertz waves before and after turning around, so as to construct terahertz imaging data of the front and back of the inspected person;

[0009] A data processing module, wherein the data processing module matches the terahertz imaging data of the inspected person's belongings with the contraband data in the terahertz fingerprint library, and determines whether the inspected person's belongings are likely to contain contraband according to the degree of matching;

[0010] A difference analysis module includes locking the inspected items close to the prohibited items determination threshold, determining the items as suspected prohibited items, and determining whether the suspected prohibited items are prohibited items through a multi-angle difference analysis strategy, and taking corresponding security inspection measures according to the determination results;

[0011] The multi-angle difference analysis strategy includes locking the suspected contraband carried by the inspected person, obtaining terahertz imaging data of multiple position states of the suspected contraband, obtaining the similarity between the terahertz imaging data of each position state of the suspected contraband and the contraband, and judging whether the suspected contraband needs to be intercepted and inspected according to the difference value of the similarity of each position state;

[0012] The specific method for judging whether suspected contraband needs to be intercepted and inspected is: when the similarity between the inspected object and the contraband in the terahertz fingerprint library is less than the prohibited item determination threshold, but greater than or equal to the suspected contraband determination threshold, obtain the similarity of all position states in which the terahertz detection source can detect the object, obtain the maximum similarity and the minimum similarity of the object in different position states respectively, and calculate the difference, compare the difference result with the interception threshold, and make a judgment on whether to intercept and inspect based on the comparison result: if the difference result is less than the interception threshold, the inspected person will be allowed to pass normally; if the difference result is greater than or equal to the interception threshold, it will be judged that there are significant differences in the terahertz imaging data detected by the inspected object in different position states, and the security inspection staff needs to intercept the inspected person for further inspection.

[0013] In some embodiments, the specific method of determining the inspected item as a suspected contraband item is:

[0014] A suspected contraband determination threshold is set, and the suspected contraband determination threshold is less than the prohibited item determination threshold. After matching the scanned personal belongings with the prohibited item data in the terahertz fingerprint library, when the similarity between the item and the contraband fails to reach the prohibited item determination threshold but reaches the suspected contraband determination threshold, the item is determined as a suspected contraband and the next step of operation is performed.

[0015] In some embodiments, the interception threshold is dynamically adjusted according to the similarity between the inspected object and the contraband matched in the terahertz fingerprint library. Specifically, the range between the contraband determination threshold and the suspected contraband determination threshold is divided into multiple determination levels. The determination levels from low to high represent that the terahertz imaging data of the inspected object increasingly matches the contraband data in the terahertz fingerprint library, and the interception threshold is dynamically adjusted according to the determination level into which the inspected object falls.

[0016] In some implementations, the interception threshold is specifically set as follows:

[0017] First set the initial interception threshold , divide the range between the prohibited item determination threshold and the suspected prohibited item determination threshold into multiple determination levels, and obtain the maximum similarity obtained by matching the inspected item with the prohibited item, mark the inspected item as a corresponding determination level according to the determination level range in which the maximum similarity falls, and Combined with the initial interception threshold Get the actual interception threshold ,in, is the adjustment factor.

[0018] In some embodiments, high-risk contraband and other contraband are classified, high-risk contraband are classified into high-risk contraband, and other contraband are classified into other contraband. If the inspected object and the similar contraband type matched in the terahertz fingerprint library belong to high-risk contraband, then after the inspected object is judged to have a corresponding determination level based on its similarity with the contraband, the determination level is increased by 1 level and does not exceed the highest determination level; if the inspected object and the similar contraband type matched in the terahertz fingerprint library belong to other contraband, no adjustment is made to the determination level of the inspected object.

[0019] The present invention also provides the following technical solution: a channel-type terahertz human body security inspection device, comprising an entrance box, a human body back terahertz imaging detection box and a human body front terahertz imaging detection box, wherein a space for the inspected person to pass through is formed between the human body back terahertz imaging detection box and the human body front terahertz imaging detection box, wherein the entrance box is installed on one side of the human body back terahertz imaging detection box and is used to guide the inspected person to enter the security inspection channel facing the human body front terahertz imaging detection box, and a connecting top cover is installed between the human body back terahertz imaging detection box and the human body front terahertz imaging detection box;

[0020] It also includes a memory and a processor coupled to the memory, wherein the processor is configured to execute the above-mentioned channel-type terahertz human body security inspection system based on instructions stored in the memory.

[0021] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the above-mentioned channel-type terahertz human body security inspection system and device.

[0022] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0023] Firstly, the present invention is based on the use of two terahertz imaging detection sources, which respectively output at different positions and angles to illuminate the detected area, thereby forming a stable terahertz light field, thereby actively realizing terahertz detection of the person being detected, so as to form accurate detection results and generate clearer images.

[0024] Secondly, the present invention uses a special Z-shaped corner design. When people pass through the prescribed path normally, they will naturally have two turning positions, so that the terahertz imaging security inspection coverage is achieved on both sides of the human body, thereby improving the detection rate of prohibited items.

[0025] Third, for suspected contraband whose terahertz imaging data differ significantly at different angles and distances, the present invention will make a secondary judgment on the inspected object based on the difference in similarity between the inspected object and the contraband in different states combined with the interception threshold. The interception threshold can be dynamically adjusted according to the degree of similarity between the inspected object and the contraband and the degree of harm, so as to ensure effective identification and interception of contraband. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a system module of a channel-type terahertz human body security inspection according to the present invention;

[0027] Figure 2 This is a schematic diagram of the system principle of a channel-type terahertz human body security inspection of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a channel-type terahertz human body security inspection device of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure decomposition of a channel-type terahertz human body security inspection device of the present invention;

[0030] Figure 5 This is a schematic diagram of the pedestrian direction of a channel-type terahertz human body security inspection device of the present invention.

[0031] In the figure: 1. Entrance box; 2. Terahertz imaging detection box on the back of the human body; 3. Connection top cover; 4. Terahertz imaging detection box on the front of the human body. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0034] See also Figure 1-Figure 2 , the present invention provides a channel-type terahertz human body security inspection system, including a guiding path module, a human body detection module, a data processing module and a result feedback module;

[0035] The guidance path module includes establishing a Z-shaped channel for the inspected persons to pass through, and using a counter to count and record the number of people passing through, triggering a single security inspection process each time a record is made; and configuring a touch-screen operation screen at the security inspection exit to simplify the handling process for security inspectors, intuitively present security inspection and imaging results, facilitate security inspectors to control, and promptly warn of security inspection results.

[0036] The human body detection module includes utilizing the turning action of the inspected person when passing through the Z-shaped channel, using two terahertz imaging detection sources to perform the security inspection process, and performing active terahertz wave scanning on the inspected person before and after turning around, respectively, to construct terahertz imaging data of the front and back of the inspected person;

[0037] Through the special corner design of the Z-shaped channel, the inspected person naturally turns twice, so that the two terahertz imaging detection sources can detect the front and back of the inspected person respectively. At the same time, when the inspected person turns, the two terahertz imaging detection sources can also cover the security inspection perspectives of the left and right sides of the human body respectively, thereby constructing complete terahertz imaging data of the inspected person's whole body and improving the accuracy of security inspection.

[0038] The data processing module includes matching the terahertz imaging data of the personal belongings of the inspected person with the prohibited items data in the terahertz fingerprint library, judging whether there is a possibility that the personal belongings of the inspected person contain prohibited items based on the degree of matching, specifically setting a prohibited items judgment threshold, and after matching the terahertz imaging data of the personal belongings of the inspected person with the prohibited items data in the terahertz fingerprint library, comparing the similarity between the personal belongings and the prohibited items with the prohibited items judgment threshold, and judging whether there are prohibited items that are not allowed to be carried in the personal belongings of the inspected person based on the comparison results.

[0039] For example, the threshold for determining prohibited items is set at 90%. When the inspected person passes through the security check channel, the scanned personal belongings are matched with the prohibited items data in the terahertz fingerprint library. The highest similarity between the terahertz imaging data of the personal belongings and all prohibited items in the terahertz fingerprint library is 86%. At this time, it can be initially determined that the personal belongings are not prohibited items.

[0040] The difference analysis module includes locking the inspected items close to the prohibited items determination threshold, specifically setting the suspected prohibited items determination threshold, the suspected prohibited items determination threshold is less than the prohibited items determination threshold, after matching the scanned personal belongings with the prohibited items data in the terahertz fingerprint library, when the similarity between the item and the prohibited items fails to reach the prohibited items determination threshold, but reaches the suspected prohibited items determination threshold, the item is determined as a suspected prohibited item, and a multi-angle difference analysis strategy is used to determine whether the suspected prohibited items are prohibited items, and corresponding security inspection measures are taken according to the judgment result. For example, according to the above embodiment, the prohibited items determination threshold is set to 90%, the similarity between the inspected item and the prohibited items reaches 86%, and the suspected prohibited items determination threshold is set to 80%. Therefore, it can be determined that the inspected item is a suspected prohibited item, and it is necessary to use a multi-angle difference analysis strategy to judge whether it is a prohibited item again.

[0041] The multi-angle difference analysis strategy includes locking the suspected contraband carried by the inspected person. Since the inspected person will make two 90° turns when passing through the Z-shaped channel, the two terahertz imaging detection sources will respectively detect the suspected contraband at different angles and distances, and obtain terahertz imaging data of multiple position states of the suspected contraband. This is mainly because the inspected person will be detected with terahertz imaging data from the front, back, left and right sides of the body, so the suspected contraband will also be detected in multiple directions. For example, if the inspected person puts a suspected contraband in the right pocket of his shirt, when he enters the terahertz body security inspection channel, the suspected contraband will be detected with terahertz imaging data at different angles and different distances from the detection source when the inspected person is detected from the front, back and right sides of the body.

[0042] At the same time, the similarity between the terahertz imaging data of each position state of the suspected contraband and the contraband is obtained, and according to the difference value of the similarity of each position state, it is judged whether the suspected contraband needs to be intercepted and inspected. This is because when using terahertz technology for detection, the terahertz imaging data obtained at different position states are quite different, which means that the inspected person may cover up the contraband, resulting in significant differences in terahertz imaging data detected in different directions. At the same time, the terahertz frequency band emitted by the terahertz imaging detection source is within the set range, and different objects will show different absorption and reflection characteristics at specific wavelengths, and the shape and structure of the object will also affect the propagation and reflection characteristics of the terahertz wave. When significant differences can be monitored at different angles and distances, it also means that at a closer distance or when changing the angle of detection, the absorption and reflection characteristics of the object will be different from the similarity of the contraband match in the terahertz fingerprint library, and it is possible that the inspected object is a contraband.

[0043] The specific method for judging whether suspected contraband needs to be intercepted and inspected is that when the similarity between the inspected item and the contraband in the terahertz fingerprint library is less than the contraband judgment threshold, but greater than or equal to the suspected contraband judgment threshold, the similarity of the terahertz detection source in all position states of the item is obtained, and the maximum similarity and minimum similarity of the item in different position states are obtained respectively and the difference is calculated, and the difference result is compared with the interception threshold, and a judgment is made based on the comparison result whether to conduct an interception inspection. For example: According to the setting of the above embodiment, the contraband judgment threshold is 90%, and the similarity between the inspected item and the contraband is up to 86%. The suspected contraband judgment threshold is set to 80%, and the similarity of the inspected item in all position states is obtained as follows:

[0044] - Front position: similarity 75%;

[0045] -Right position: similarity 62%;

[0046] -Back position: similarity 86%;

[0047] The maximum similarity of 86% in the back position state and the minimum similarity of 62% in the right position state are subtracted, and the difference result is 24%. The interception threshold is set to 25%. Since the difference result is less than the interception threshold, it can be judged that the difference in terahertz imaging data of the inspected object in each position state is low, and there is no possibility that it is a prohibited item. The inspected person can pass normally. If the difference result is greater than or equal to the interception threshold, it can be judged that there are significant differences in the terahertz imaging data of the inspected object detected in different position states. Therefore, the security personnel need to intercept the inspected person for further inspection to confirm whether there are prohibited items among the items they carry with them.

[0048] Furthermore, as another preferred embodiment of the present invention, the specific setting method of the interception threshold can be dynamically adjusted according to the similarity between the inspected object and the contraband matched in the terahertz fingerprint library. Specifically, the range between the contraband determination threshold and the suspected contraband determination threshold is divided into multiple determination levels. The determination level from low to high represents that the terahertz imaging data of the inspected object is more and more matched with the contraband data in the terahertz fingerprint library, and the interception threshold is dynamically adjusted according to the determination level into which the inspected object falls. Specifically, the initial interception threshold is first set. , divide the range between the prohibited item determination threshold and the suspected prohibited item determination threshold into multiple determination levels, and obtain the maximum similarity obtained by matching the inspected item with the prohibited item, mark the inspected item as a corresponding determination level according to the determination level range in which the maximum similarity falls, and Combined with the initial interception threshold Get the actual interception threshold ,in, is the adjustment factor.

[0049] For example, according to the above embodiment, the contraband determination threshold is set to 90%, the suspected contraband determination threshold is set to 80%, the initial interception threshold is set to 25%, and the range between the contraband determination threshold and the suspected contraband determination threshold is equally divided into multiple determination levels. The division method is as follows:

[0050] - Level 1 judgment levels are: ;

[0051] - Level 2 judgment levels are: ;

[0052] - Level 3 judgment levels are: ;

[0053] - Level 4 judgment levels are: ;

[0054] - The 5-level judgment level is: ;

[0055] The similarity between the inspected item and the prohibited item is set to 86% at most. Therefore, the inspected item falls into the 4th level of judgment. Since the initial interception threshold is 25%, the adjustment factor is set The actual interception threshold can be obtained by , i.e. 10%. According to the above embodiment, the maximum similarity of 86% in the back position state and the minimum similarity of 62% in the right position state are subtracted to obtain a difference result of 24%. The difference result is compared with the actual interception threshold. Since the difference result is greater than or equal to the actual interception threshold, it can be determined that there are significant differences in the terahertz imaging data of the inspected object under different position states. The security personnel need to intercept the inspected person for further inspection to confirm whether there are any contraband items in the items they carry with them.

[0056] In addition, when determining the level of determination that the inspected item falls into, it is also possible to determine the type of similar prohibited items matched between the inspected item and the terahertz fingerprint library, and adjust the determination level accordingly. The specific adjustment method is to set the classification of high-risk prohibited items and other prohibited items, and for the actual application scenario of the terahertz security inspection system, classify the most dangerous prohibited items into high-risk prohibited items, and classify the remaining prohibited items into other prohibited items. If the inspected item and the type of similar prohibited items matched in the terahertz fingerprint library belong to high-risk prohibited items, then after the inspected item is determined to have the corresponding determination level based on its similarity to the prohibited items, the determination level is raised by 1 level, and does not exceed the highest determination level; if the inspected item and the type of similar prohibited items matched in the terahertz fingerprint library belong to other prohibited items, no adjustment is made to the determination level of the inspected item. In practical applications, contraband such as explosives, drugs and toxic chemicals, which are generally considered to be the most harmful, can be included in the classification of high-risk contraband. In this way, when terahertz technology is used to detect that the items carried by the inspected person are more similar to such high-risk contraband, the system can more sensitively capture abnormalities in the terahertz imaging data of the inspected items by increasing the judgment level.

[0057] In general, the present invention aims to design a channel-type terahertz human body security inspection system, which is aimed at the traditional security inspection method, which is time-consuming and labor-intensive, and the detection accuracy of most passive detection terahertz devices is not ideal, and there is also the problem that the detection range cannot cover the whole body of the inspected person. The present invention is based on the use of two terahertz imaging detection sources, which are output at different positions and different angles to illuminate the detected area, forming a stable terahertz light field, so as to actively realize terahertz detection of the inspected person. During the normal passage of the person in the channel, the body will reflect the terahertz light, which will be received by the terahertz optical coupling lens and the terahertz camera. The generated terahertz human body security inspection image records the movement process of the person in the channel in the form of multi-frame dynamic continuous shooting. The terahertz human body security inspection results can be obtained through the terahertz imaging data, so as to determine whether dangerous prohibited items are carried. At the same time, through the special Z-shaped corner design, the security inspection imaging angle coverage of the whole side of the human body is achieved, which improves the detection rate of carrying dangerous prohibited items. For suspected contraband with significant differences in terahertz imaging data at different angles and distances, the inspected items will be judged again by the difference in similarity between the inspected items and the contraband in different states, combined with the interception threshold, and the interception threshold can be dynamically adjusted according to the similarity between the inspected items and the contraband and the degree of harm, to ensure effective identification and interception of contraband, and avoid missed inspections of contraband due to the influence of obstructions on the reflection and absorption characteristics of contraband, and the differences in the absorption and reflection characteristics of different items. Ensure that security inspectors can respond to suspicious items in a timely manner and intercept the inspected persons for further inspection.

[0058] See also Figure 3-Figure 5 The present invention provides a channel-type terahertz human body security inspection device, comprising an entrance box 1, a human body back terahertz imaging detection box 2 and a human body front terahertz imaging detection box 4, wherein a space for a person to be inspected to pass through is formed between the human body back terahertz imaging detection box 2 and the human body front terahertz imaging detection box 4, and the entrance box 1 is installed on one side of the human body back terahertz imaging detection box 2, and is used to guide the person to be inspected to enter the security inspection channel facing the human body front terahertz imaging detection box 4, and after entering the channel, the person to be inspected needs to pass through the space between the human body back terahertz imaging detection box 2 and the human body front terahertz imaging detection box 4, and leave the security inspection channel with his back facing the human body back terahertz imaging detection box 2 (the path passed by the person to be inspected is as follows Figure 5 A connecting top cover 3 is installed between the human body back terahertz imaging detection box 2 and the human body front terahertz imaging detection box 4;

[0059] The device for channel-type terahertz body security inspection also includes a memory and a processor coupled to the memory, and the processor is configured to execute the above-mentioned channel-type terahertz body security inspection system based on instructions stored in the memory.

[0060] The embodiments disclosed in the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. The embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from a removable medium. When the computer program is executed by the central processing unit, the above functions defined in the method of the present application are executed. It should be noted that the computer-readable medium mentioned above in the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, a system, device or device of an electrical, magnetic, optical, electromagnetic, infrared segment, or semiconductor, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wire segments, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless segments, wire segments, optical cables, RF, etc., or any suitable combination of the above.

[0061] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0062] Those skilled in the art should understand that the above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A channel-type terahertz human body security inspection system, characterized in that: include: A guidance path module, wherein the guidance path module includes establishing a Z-shaped channel for the inspected persons to pass through, and using a counter to count and record the number of people passing through, and each time a record is made, a single security inspection process is triggered; A human body detection module, wherein the human body detection module utilizes the turning action of the inspected person when passing through the Z-shaped channel, and uses two terahertz imaging detection sources to actively scan the inspected person with terahertz waves before and after turning around, so as to construct terahertz imaging data of the front and back of the inspected person; A data processing module, wherein the data processing module matches the terahertz imaging data of the inspected person's belongings with the contraband data in the terahertz fingerprint library, and determines whether the inspected person's belongings are likely to contain contraband according to the degree of matching; A difference analysis module includes locking the inspected items close to the prohibited items determination threshold, determining the items as suspected prohibited items, and determining whether the suspected prohibited items are prohibited items through a multi-angle difference analysis strategy, and taking corresponding security inspection measures according to the determination results; The multi-angle difference analysis strategy includes locking the suspected contraband carried by the inspected person, obtaining terahertz imaging data of multiple position states of the suspected contraband, obtaining the similarity between the terahertz imaging data of each position state of the suspected contraband and the contraband, and judging whether the suspected contraband needs to be intercepted and inspected according to the difference value of the similarity of each position state; The specific method for judging whether suspected contraband needs to be intercepted and inspected is: when the similarity between the inspected object and the contraband in the terahertz fingerprint library is less than the prohibited item determination threshold, but greater than or equal to the suspected contraband determination threshold, obtain the similarity of all position states in which the terahertz detection source can detect the object, obtain the maximum similarity and the minimum similarity of the object in different position states respectively, and calculate the difference, compare the difference result with the interception threshold, and make a judgment on whether to intercept and inspect based on the comparison result: if the difference result is less than the interception threshold, the inspected person will be allowed to pass normally; if the difference result is greater than or equal to the interception threshold, it will be judged that there are significant differences in the terahertz imaging data detected by the inspected object in different position states, and the security inspection staff needs to intercept the inspected person for further inspection.

2. A channel-type terahertz human body security inspection system according to claim 1, characterized in that: The specific methods for determining the inspected items as suspected contraband are: A suspected contraband determination threshold is set, and the suspected contraband determination threshold is less than the prohibited item determination threshold. After matching the scanned personal belongings with the prohibited item data in the terahertz fingerprint library, when the similarity between the item and the contraband fails to reach the prohibited item determination threshold but reaches the suspected contraband determination threshold, the item is determined as a suspected contraband and the next step of operation is performed.

3. The channel-type terahertz human body security inspection system according to claim 1, characterized in that: The interception threshold is dynamically adjusted according to the similarity between the inspected object and the contraband matched in the terahertz fingerprint library. Specifically, the range between the contraband determination threshold and the suspected contraband determination threshold is divided into multiple determination levels. The determination levels from low to high represent that the terahertz imaging data of the inspected object increasingly matches the contraband data in the terahertz fingerprint library, and the interception threshold is dynamically adjusted according to the determination level into which the inspected object falls.

4. The channel-type terahertz human body security inspection system according to claim 3, characterized in that: The specific setting method of the interception threshold is: First set the initial interception threshold , divide the range between the prohibited item determination threshold and the suspected prohibited item determination threshold into multiple determination levels, and obtain the maximum similarity obtained by matching the inspected item with the prohibited item, mark the inspected item as a corresponding determination level according to the determination level range in which the maximum similarity falls, and Combined with the initial interception threshold Get the actual interception threshold ,in, is the adjustment factor.

5. The channel-type terahertz human body security inspection system according to claim 4, characterized in that: Set the classification of high-risk contraband and other contraband, classify high-risk contraband into high-risk contraband, and classify the remaining contraband into other contraband. If the inspected item and the similar contraband type matched in the terahertz fingerprint library belong to high-risk contraband, then after the inspected item is judged to have the corresponding judgment level according to its similarity with the contraband, the judgment level is raised by 1 level, and does not exceed the highest judgment level; if the inspected item and the similar contraband type matched in the terahertz fingerprint library belong to other contraband, the judgment level of the inspected item is not adjusted.

6. A channel-type terahertz human body security inspection device, characterized in that: A channel-type terahertz human body security inspection system according to any one of claims 1 to 5, the device comprising an entrance box (1), a human body back terahertz imaging detection box (2) and a human body front terahertz imaging detection box (4), a space for a person to be inspected to pass through is formed between the human body back terahertz imaging detection box (2) and the human body front terahertz imaging detection box (4), the entrance box (1) is installed on one side of the human body back terahertz imaging detection box (2) and is used to guide the person to be inspected to enter the security inspection channel facing the human body front terahertz imaging detection box (4), and a connecting top cover (3) is installed between the human body back terahertz imaging detection box (2) and the human body front terahertz imaging detection box (4); The device also includes a memory and a processor coupled to the memory, wherein the processor is configured to execute the above-mentioned channel-type terahertz human body security inspection system based on instructions stored in the memory.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement a channel-type terahertz human body security inspection system as described in any one of claims 1 to 5.

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