Flat plate type terahertz human body imaging security check system and device

Abstract

The invention relates to the technical field of terahertz security check, and discloses a flat plate type terahertz human body imaging security check system and equipment, which comprises a parameter acquisition module, a parameter comparison module and a degree response module. In the secondary inspection process, the similarity of the second contraband is compared with the similarity of the first contraband, and only when the similarity of the second contraband is equal to or higher than the similarity of the first contraband, the marked suspected contraband is manually inspected. And the condition that the similarity of the second contraband is smaller than that of the first contraband is released, so that all suspected contrabands are not manually inspected once on the basis of ensuring strict inspection from reality, and the security inspection efficiency and the passing efficiency of the to-be-inspected personnel are ensured.

Description

Technical Field

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

[0002] Terahertz security scanners are divided into active and passive types. For passive terahertz security scanners, they rely on the weak terahertz signals of the environment and human spontaneous radiation, and complete terahertz security inspections through the weak signal detection principle of the detector. The detection results of this type of equipment are easily affected by external environmental temperature, humidity changes and other conditions, and its terahertz imaging resolution and contrast are poor, which cannot meet the image recognition requirements of accurate security inspections. For active terahertz security scanners, they actively emit terahertz light to illuminate the human body detection area, and the terahertz light reflected by the human body is also collected and recorded by the transceiver unit, and the signal is processed through the array-arranged terahertz transceiver detection channel. At the same time, relying on the vertical displacement of the horizontally placed terahertz detection unit, a high-definition original image of the human body terahertz security inspection imaging is obtained.

[0003] During the terahertz security inspection process, the terahertz signal obtained by scanning feedback is often used to calculate the similarity to match it with the system library, and the degree of similarity is used to determine whether there are contraband. In this process, in line with the principle of strict security inspection, all possible contraband needs to be inspected, which easily leads to a "one-size-fits-all" phenomenon. Although this can strictly prevent contraband from passing through, it also affects the efficiency of security inspection and the efficiency of the people to be inspected. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a system and equipment for flat-panel terahertz human body imaging security inspection, so as to ensure the security inspection efficiency and passing efficiency while performing strict security inspection.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flat-plate terahertz human body imaging security inspection system, comprising: a parameter acquisition module: used to transmit terahertz waves to scan the inspected person through a terahertz security inspection instrument, a receiver receives the reflected terahertz wave signal, and the system processes the terahertz wave signal to obtain the contraband similarity data of the personal belongings of the inspected person; a parameter comparison module: used to compare the contraband similarity of the personal belongings of the inspected person with the system preset contraband similarity threshold, and make different responses according to the comparison result. If the contraband similarity is greater than or equal to the contraband similarity threshold, it is marked as a contraband, an early warning is issued, and a staff member is prompted to conduct a manual inspection; if the contraband similarity is less than the contraband similarity threshold, different responses are made according to the degree of less than; a degree response module: if the degree of contraband similarity of the personal belongings of the inspected person is less than the contraband similarity threshold, it is released; if the degree of contraband similarity of the personal belongings of the inspected person is less than the contraband similarity threshold, a secondary judgment is made.

[0006] In some implementations, the specific situation where the degree to which the contraband similarity of the person to be inspected is less than the contraband similarity threshold is that the contraband similarity of the person to be inspected is less than the contraband similarity threshold, but close to the contraband similarity threshold.

[0007] In some implementations, the secondary judgment process is: setting a suspected contraband threshold that is slightly lower than a contraband similarity threshold, comparing the contraband similarity of the person to be inspected's belongings with the suspected contraband threshold, and arriving at different responses based on the comparison results.

[0008] In some embodiments, if the contraband similarity of the person to be inspected's carry-on items is less than the suspected contraband threshold, it indicates that there are no suspected contraband in the person to be inspected's carry-on items, and the person to be inspected is released; if the contraband similarity of the person to be inspected's carry-on items is greater than or equal to the suspected contraband threshold, and less than the contraband similarity threshold, it indicates that the person to be inspected's carry-on items are suspected to be contraband, and the system marks them as suspected contraband and takes corresponding measures for the suspected contraband.

[0009] In some embodiments, the method of handling suspected contraband is: ask the person to be inspected to undergo a second security check. During the second security check, in addition to scanning the front and back of the person to be inspected, both sides of the person to be inspected are scanned and inspected to obtain the second contraband similarity data of the scan and inspection, compare the second contraband similarity with the first contraband similarity, and make different responses based on the comparison results.

[0010] In some embodiments, when the second contraband similarity is equal to the first contraband similarity, it indicates that the additional scanning of both sides of the person to be inspected has no effect on the contraband similarity, and this addition cannot accurately judge the suspected contraband. In this case, manual inspection is performed; when the second contraband similarity is greater than the first contraband similarity, it means that the additional inspection on both sides makes the suspected contraband more suspicious. In this case, manual inspection is performed; when the second contraband similarity is less than the first contraband similarity, it means that the additional inspection on both sides makes the suspected contraband less suspicious. In this case, it is released.

[0011] In some implementations, the results of manual inspections to determine whether suspected contraband is contraband are recorded, and the suspected contraband threshold is dynamically adjusted using data on all times the suspected contraband is processed and the times the suspected contraband is determined to be contraband.

[0012] In some embodiments, the dynamic adjustment method is: within a preset period, all the times of handling suspected contraband and the times of determining that the suspected contraband is a contraband are obtained, and the ratio of the number of times it is determined to be a contraband to the number of times the suspected contraband is handled is used as the accuracy rate. At the same time, a accuracy rate threshold is preset, and the accuracy rate is compared with the accuracy rate threshold. If the accuracy rate is greater than or equal to the accuracy rate threshold, continue to use this suspected contraband threshold for judgment; if the accuracy rate is less than the accuracy rate threshold, increase the suspected contraband threshold.

[0013] The present invention also provides the following technical solutions:

[0014] The present invention further provides a flat-plate terahertz human body imaging security inspection device, comprising a standing board, a security inspection instrument body is installed on the top of the standing board, a control box is arranged on the back of the security inspection instrument body, a baffle is arranged on the front, a display is arranged on the side, a terahertz wave transmitter is arranged inside, and a driving mechanism for driving the terahertz transmitter to move up and down.

[0015] 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 flat-panel terahertz human body imaging security inspection system.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] First, in the present invention, the contraband similarity data of the personal belongings of the inspected person detected by the terahertz security scanner in the first scan is first obtained, and the contraband similarity is compared with the preset contraband similarity threshold. If the contraband similarity is greater than or equal to the contraband similarity threshold, the system marks it as a contraband, issues an early warning, and prompts the staff to conduct a manual inspection. If the contraband similarity is less than the contraband similarity threshold, the response is then based on the degree of being less than the contraband similarity threshold. If the degree of being less than the contraband similarity threshold is high, it indicates that the carried items are not contraband and are released. If the degree is lower than the contraband similarity threshold, it indicates that there may be contraband. At this time, a secondary judgment is made. During the secondary judgment, a suspected contraband threshold is set, and the contraband similarity of the person to be inspected is compared with the suspected contraband threshold. If the contraband similarity of the person to be inspected is less than the suspected contraband threshold, it indicates that there is no suspected contraband in the person to be inspected, and the person to be inspected is released; if the contraband similarity of the person to be inspected is greater than or equal to the suspected contraband threshold, and less than the contraband similarity threshold, it indicates that the person to be inspected is suspected to be a contraband, and the system marks it as a suspected contraband and handles the suspected contraband accordingly. In this way, considering that the actual security inspection of the terahertz security scanner may result in a lower detection result than the actual one, the person to be inspected can be reasonably inspected.

[0018] Secondly, in the present invention, during the secondary inspection process, the similarity of the second prohibited items is compared with the similarity of the first prohibited items. Only when the similarity of the second prohibited items is equal to or higher than the similarity of the first prohibited items is the marked suspected contraband manually inspected, and when the similarity of the second prohibited items is lower than the similarity of the first prohibited items, the contraband is released. In this way, from a practical point of view, on the basis of ensuring strict inspection, not all suspected contraband are subjected to a one-size-fits-all manual inspection, thereby ensuring the efficiency of security inspection and the passing efficiency of the persons to be inspected.

[0019] Third, in the present invention, the results of the previous secondary inspections are recorded. Within a cycle, the ratio of the number of times the prohibited items are determined to be contraband to the number of times the suspected contraband is processed during the secondary inspection is used as the accuracy rate, and the accuracy rate is compared with the preset accuracy rate threshold. If the accuracy rate is greater than or equal to the accuracy rate threshold, it means that the accuracy rate is very high under this suspected contraband threshold, and this suspected contraband threshold can continue to be used for judgment. If the accuracy rate is less than the accuracy rate threshold, it means that the accuracy rate does not reach the ideal standard under this suspected contraband threshold. At this time, the suspected contraband threshold needs to be increased. Through such a setting, the suspected contraband threshold can be dynamically adjusted to adapt to the new contraband that continues to appear on the market, so that the security inspection equipment can remain active and keep up with the update rhythm of contraband. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the module structure of the present invention;

[0021] Figure 2 It is a logical structure diagram of the present invention;

[0022] Figure 3 It is an overall diagram of the terahertz security inspection device in the present invention;

[0023] Figure 4 This is an internal diagram of the terahertz security inspection device in the present invention.

[0024] In the attached drawings: 1. standing board; 2. security scanner body; 3. control box; 4. baffle; 5. display; 6. terahertz wave transmitter; 7. driving mechanism. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] The flat-plate terahertz human body imaging security inspection device provided by the present invention is as follows: Figure 3 and Figure 4As shown, it includes a standing board 1 for prompting the person to be inspected to stand, and the top of the standing board 1 is installed with a security inspection instrument body 2. The back of the security inspection instrument body 2 is a control box 3, the front is a baffle 4 for shielding the interior, and the side is a display 5 for displaying terahertz imaging. A terahertz wave transmitter 6 is installed inside the security inspection instrument body 2. The terahertz wave transmitter 6 can be vertically lifted and lowered under the action of a driving mechanism 7 set on the security inspection instrument body 2, and reciprocates from the top to the bottom and from the bottom to the top, covering the area in the height direction of the human body in a mechanical scanning manner. In addition, according to the security inspection requirements, two of the security inspection equipment can be set side by side to scan the front and back of the person to be inspected at the same time. When using a security inspection device, the person to be inspected is asked to stand on the standing board 1 first, and the driving mechanism 7 in the security inspection instrument body 1 drives the terahertz wave transmitter 6 to reciprocate up and down to scan the front of the person to be inspected in all directions. After that, the person to be inspected is asked to turn to the back and repeat the above steps to scan the back of the person to be inspected in all directions up and down. When two security inspection devices are used, the person to be inspected is asked to stand between the two security inspection devices, with the front and back of the person to be inspected facing one security inspection device respectively, and then the driving mechanism 7 is used to drive the terahertz wave transmitter 6 to move up and down to scan the person to be inspected.

[0028] The flat-plate terahertz human body imaging security inspection system provided by the present invention is as follows: Figure 1 and Figure 2 As shown, including:

[0029] Parameter acquisition module: This module uses a terahertz wave transmitter to emit terahertz waves to scan the person to be inspected. When the terahertz wave irradiates the person to be inspected, the wavelength penetrates the clothing and interacts with the items carried by the person. Different materials have different absorption and scattering characteristics of terahertz waves, and these characteristics are preserved in the reflected waves. The reflected terahertz waves carry the spatial information and material characteristics of the illuminated object back to the receiver. The system processes the signal received by the receiver, and comprehensively transforms the image data obtained from the spatial information and the type information obtained from the material characteristics to obtain the contraband similarity data of the person to be inspected. This similarity data provides important reference information for staff, helping them to quickly identify potential contraband items and improve the efficiency and accuracy of security inspections.

[0030] Parameter comparison module: This module compares the contraband similarity with the contraband similarity threshold preset by the system, and responds according to the comparison result. If the contraband similarity is greater than or equal to the contraband similarity threshold, it indicates that there are contrabands in the items carried by the person to be inspected. The system marks it as a contraband and issues an early warning to remind the staff to conduct a manual inspection. If the contraband similarity is less than the contraband similarity threshold, it indicates that no contraband is detected by the terahertz security scanner in the items carried by the person to be inspected. However, this does not mean that there are no contraband in the personal belongings of the person to be inspected, because the similarity of the detected contraband may be lower than the normal value in some cases, for example: 1. If the contraband is wrapped in a material that can effectively absorb or reflect terahertz waves (such as metal foil or certain plastics), the terahertz wave may not penetrate, resulting in a similarity detection result lower than the actual value. 2. If the location of the contraband is in a complex part of the human body or is blocked by other legal items with a higher density, it may affect the reflection and detection results of the terahertz wave. 3. Environmental factors such as humidity, temperature or other electromagnetic interference may affect the propagation and reflection of terahertz waves, thereby affecting the detection accuracy. 4. Multiple items stacked together may generate complex reflection signals, making it difficult for the system to accurately evaluate the similarity of individual items. 5. In the present invention, even if two security inspection devices are set side by side and scan the front and back of the person to be inspected at the same time, some of the two sides of the person to be inspected will be ignored, which will also cause the similarity detection result to be lower than the actual one. However, although the above situation may affect the similarity of the detected contraband during the actual security inspection, even if the similarity of the contraband is lower than the actual one due to packaging materials, environmental factors, stacking of items, etc., if there are indeed contraband, the detected similarity of the contraband will not be too much lower than the contraband similarity threshold. Because: 1. The terahertz security inspection system not only relies on a single signal strength, but also may make a comprehensive judgment by analyzing multi-dimensional features (such as spectrum, time delay, spatial distribution, etc.). These feature combinations make the system robust to interference. 2. Many contraband materials have unique reflection or absorption properties in the terahertz band, and even if they are partially shielded, these properties may still stand out significantly from the background. 3. The signal processing algorithm has been trained and optimized to recognize and compensate for a certain degree of interference. For example, signal pattern recognition and interference modeling can be used to enhance the reliability of detection. Therefore, when the contraband similarity is less than the contraband similarity threshold, a degree response module is introduced to handle the person to be inspected differently according to the degree to which the contraband similarity is less than the contraband similarity threshold. Specifically: if the contraband similarity of the personal belongings of the person to be inspected is too much less than the contraband similarity threshold, it indicates that the degree of less than is high and can be released directly.When the similarity of prohibited items in the personal belongings of the person to be inspected is less than the prohibited items similarity threshold, but close to the prohibited items similarity threshold, it indicates that the degree of similarity is low and the person to be inspected cannot be released directly. Instead, a secondary judgment must be made to avoid missing prohibited items.

[0031] Secondary judgment module: This module is used to re-judge the personal belongings of the person to be inspected when the similarity of the prohibited items in the personal belongings of the person to be inspected is less than the similarity threshold of the prohibited items, but close to the similarity threshold of the prohibited items, so as to prevent the missed prohibited items from passing. The specific process of re-judgment is as follows: set the suspected threshold of prohibited items, which is slightly lower than the similarity threshold of prohibited items. Compare the similarity of the prohibited items in the personal belongings of the person to be inspected with the suspected threshold of prohibited items, and obtain different responses according to the comparison results. If the similarity of the prohibited items in the personal belongings of the person to be inspected is less than the suspected threshold of prohibited items, it indicates that there are no suspected prohibited items in the personal belongings of the person to be inspected, and the person to be inspected is released. If the similarity of the prohibited items in the personal belongings of the person to be inspected is greater than or equal to the suspected threshold of prohibited items, and is less than the similarity threshold of prohibited items, it indicates that the personal belongings of the person to be inspected may be prohibited items, and the system marks them as suspected prohibited items, and makes corresponding responses to the suspected prohibited items. For example, suppose the similarity threshold of prohibited items is 90% and the suspected threshold of prohibited items is 85%. When the terahertz security scanner checks the personal belongings of the inspected person, if the similarity of the prohibited items in the personal belongings of the inspected person is 91%, it means that there are prohibited items in the personal belongings. The system marks it, issues an early warning, and reminds the staff to conduct manual inspection. If the similarity of the prohibited items in the personal belongings of the inspected person is 82%, it means that there are no prohibited items in the personal belongings, and the inspected person is released. If the similarity of the prohibited items in the personal belongings of the inspected person is 86%, it means that there may be prohibited items in the personal belongings. The system marks it as suspected prohibited items and handles the suspected prohibited items accordingly.

[0032] How to deal with suspected contraband: When there is only one security device, please ask the person to be inspected to re-inspect. During the security inspection, the normal process is that the person to be inspected faces the security device for scanning and then faces the security device for scanning. Now, both sides of the person to be inspected are scanned. Please scan the front and back of the person to be inspected and then turn around to scan both sides. When two security devices are set up side by side, the normal process is that the person to be inspected is located between the two security devices and scans both the back and the front. Now, both sides of the person to be inspected are scanned. When the person to be inspected re-scans, in addition to scanning the back and the front, turn around and face both sides of the two security devices. After the second re-inspection scan, the second contraband similarity data of the person to be inspected's personal belongings is obtained. The second contraband similarity is compared with the first contraband similarity, and different responses are made according to the comparison results. When the similarity of the second contraband is basically equal to the similarity of the first contraband, it indicates that the additional scanning of both sides of the person to be inspected has no effect on the similarity of the contraband, and this addition cannot accurately judge the suspected contraband. Therefore, in this case, manual inspection is performed. When the similarity of the second contraband is greater than the similarity of the first contraband, it means that the additional inspection on both sides makes the suspected contraband more suspicious. In this case, it is also necessary to conduct manual inspection. When the similarity of the second contraband is less than the similarity of the first contraband, it means that the additional inspection on both sides makes the suspected contraband less suspicious. In this case, although the first and second inspections are suspected, the suspicion level is reduced during the second inspection, so it can be released. In the above manner, after judging that the personal belongings of the person to be inspected are suspected contraband, the suspected contraband is judged for the second time. If the contraband similarity obtained in the second judgment is equal to or greater than the contraband similarity obtained in the first judgment, it means that the suspected degree of the contraband carried by the person to be inspected has not decreased. Therefore, in this case, manual inspection is performed to determine. If the similarity of the contraband obtained in the second judgment is less than that obtained in the first judgment, it means that the suspected degree of the contraband carried by the person to be inspected has decreased. In this case, the person can be released. In this way, it is not necessary to manually inspect all the marked suspected contraband. On the basis of ensuring strict inspection, it can also improve the inspection efficiency to a certain extent, because manual inspection is the least efficient and time-consuming compared to other inspection methods.

[0033] Based on the above, in the process of reprocessing suspected contraband, each time a suspected contraband is processed, it is recorded, and the result of manual inspection whether the suspected contraband is a contraband is also recorded. The suspected contraband threshold can be dynamically adjusted using the data of all the times suspected contraband is processed and the number of times suspected contraband is determined to be a contraband. The specific method is: within one cycle, obtain the number of times all suspected contraband is processed and the number of times suspected contraband is determined to be a contraband. The ratio of the number of times it is determined to be a contraband to the number of times suspected contraband is processed is taken as the accuracy rate. At the same time, a correctness threshold is preset, and the correctness is compared with the correctness threshold, and different responses are made according to the comparison results. If the correctness is greater than or equal to the correctness threshold, it means that the set suspected contraband threshold is accurate, and this suspected contraband threshold can continue to be used for judgment. If the accuracy is less than the accuracy threshold, it means that the set suspected contraband threshold is inaccurate, that is, among all the times of handling suspected contraband, the number of times the suspected contraband is determined to be contraband is relatively small, which also means that the set suspected contraband threshold is relatively low, so too many personal belongings are marked as suspected contraband. In this case, the suspected contraband threshold needs to be raised. Because the actual calculated accuracy corresponds to the initially set suspected contraband threshold, and the accuracy threshold corresponds to the suspected contraband threshold that needs to be raised, the two groups of correspondence are directly proportional, so the suspected contraband threshold that needs to be raised is equal to the initially set suspected contraband threshold multiplied by the accuracy threshold and then divided by the actual calculated accuracy. For example, assuming that the suspected contraband threshold is 85%, the accuracy threshold is 98%, and the actual calculated accuracy is 95%, then the raised suspected contraband threshold = 85% × 98% ÷ 95% = 87.7%. By regularly analyzing and adjusting the suspected contraband threshold, the security inspection system can more accurately identify potential security threats and reduce the false alarm rate. This means that as data is accumulated and analyzed, the system can better distinguish between real threats and false alarms and reduce unnecessary manual inspections. This not only saves resources, but also increases the speed of inspection for those waiting to be inspected and improves their experience. In addition, dynamic adjustment can adapt to the ever-changing security environment. Security threats are dynamic and changeable, and new prohibited items and methods may continue to emerge. Through the dynamic adjustment mechanism, the security inspection system can respond to emerging threats in a timely manner and adjust its detection sensitivity. This flexibility ensures that the system is always in the best condition and can effectively cope with emerging challenges. In addition, dynamic adjustment improves resource management efficiency. By reducing false alarms and unnecessary manual intervention, security inspectors can devote more energy and time to events that really need attention. This way of optimizing resource allocation not only improves work efficiency, but also reduces operating costs. This efficiency improvement is particularly important during peak or special periods. Finally, this mechanism can also improve the experience and satisfaction of those waiting to be inspected.Reducing false alarms and speeding up security checks means that people waiting to be checked can pass the security check process more smoothly, reducing unnecessary troubles and delays along the way. This focus on the experience of people waiting to be checked has improved their satisfaction with security check services.

[0034] In summary, the present invention first obtains the contraband similarity data of the personal belongings of the inspected person detected by the terahertz security scanner in the first scan, and compares the contraband similarity with the preset contraband similarity threshold. If the contraband similarity is greater than or equal to the contraband similarity threshold, the system marks it as a contraband, issues an early warning, and prompts the staff to conduct a manual inspection. If the contraband similarity is less than the contraband similarity threshold, the system responds according to the degree of being less than the contraband similarity threshold. If the degree of being less than the contraband similarity threshold is high, it indicates that the carried items are not prohibited and are released. If the degree is lower than the contraband similarity threshold, it indicates that there may be contraband. At this time, a secondary judgment is made. During the secondary judgment, a suspected contraband threshold is set, and the contraband similarity of the person to be inspected is compared with the suspected contraband threshold. If the contraband similarity of the person to be inspected is less than the suspected contraband threshold, it indicates that there is no suspected contraband in the person to be inspected, and the person to be inspected is released; if the contraband similarity of the person to be inspected is greater than or equal to the suspected contraband threshold, and less than the contraband similarity threshold, it indicates that the person to be inspected is suspected to be a contraband, and the system marks it as a suspected contraband and handles the suspected contraband accordingly. In this way, considering that the actual security inspection of the terahertz security scanner may result in a lower detection result than the actual one, the person to be inspected can be reasonably inspected. Secondly, during the secondary inspection, the similarity of the second prohibited item is compared with the similarity of the first prohibited item. Only when the similarity of the second prohibited item is equal to or higher than the similarity of the first prohibited item, the marked suspected prohibited item is manually inspected. If the similarity of the second prohibited item is less than the similarity of the first prohibited item, it is released. In this way, based on the actual situation, on the basis of ensuring strict inspection, not all suspected contrabands are manually inspected in a one-size-fits-all manner, which ensures the efficiency of security inspection and the passing efficiency of the inspected personnel. Finally, the results of the previous secondary inspections are recorded. Within a cycle, the ratio of the number of times the prohibited items are determined to be contraband to the number of times the suspected contraband is processed during the secondary inspection is taken as the correct rate, and the correct rate is compared with the preset correct rate threshold. If the correct rate is greater than or equal to the correct rate threshold, it means that the correct rate is very high under this suspected contraband threshold, and this suspected contraband threshold can continue to be used for judgment. If the correct rate is less than the correct rate threshold, it means that the correct rate does not reach the ideal standard under this suspected contraband threshold. At this time, the suspected contraband threshold needs to be increased. Through such settings, the suspected threshold of prohibited items can be dynamically adjusted to adapt to the new prohibited items that continue to appear on the market, so that security inspection equipment can remain dynamic and keep up with the pace of updates of prohibited items.

[0035] In the embodiments disclosed in the present invention, the processes 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 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, an electrical, magnetic, optical, electromagnetic, infrared or semiconductor system, device or device, 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.

[0036] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in a different order than the order marked in the accompanying drawings. For example, two 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 box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, 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.

[0037] 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 flat-plate terahertz human body imaging security inspection system, characterized in that: include: Parameter acquisition module: used to transmit terahertz waves to scan the person to be inspected through the terahertz security scanner, and the receiver receives the reflected terahertz wave signal. The system processes the terahertz wave signal to obtain the contraband similarity data of the person to be inspected's belongings; Parameter comparison module: used to compare the similarity of prohibited items in the personal belongings of the inspected personnel with the system preset similarity threshold of prohibited items, and make different responses according to the comparison results. If the similarity of prohibited items is greater than or equal to the similarity threshold of prohibited items, it will be marked as a prohibited item, and an early warning will be issued to prompt the staff to conduct manual inspection; if the similarity of prohibited items is less than the similarity threshold of prohibited items, different responses will be made according to the degree of less than; Degree response module: If the degree of similarity between the prohibited items in the personal belongings of the person to be inspected is lower than the degree of similarity threshold of the prohibited items, the person to be inspected will be released; if the degree of similarity between the prohibited items in the personal belongings of the person to be inspected is lower than the degree of similarity threshold of the prohibited items, a secondary judgment will be made.

2. The flat-panel terahertz human body imaging security inspection system according to claim 1, characterized in that: The specific situation that the degree to which the contraband similarity of the personal belongings of the person to be inspected is lower than the contraband similarity threshold is that the contraband similarity of the personal belongings of the person to be inspected is lower than the contraband similarity threshold, but close to the contraband similarity threshold.

3. The flat-panel terahertz human body imaging security inspection system according to claim 1, characterized in that: The secondary judgment process is: set a suspected contraband threshold, which is slightly lower than the contraband similarity threshold, compare the contraband similarity of the person to be inspected with the suspected contraband threshold, and come up with different responses based on the comparison results.

4. The flat-panel terahertz human body imaging security inspection system according to claim 3 is characterized in that: If the similarity of prohibited items in the personal belongings of the person to be inspected is less than the suspected prohibited item threshold, it means that there are no suspected prohibited items in the personal belongings of the person to be inspected, and the person to be inspected will be released; if the similarity of prohibited items in the personal belongings of the person to be inspected is greater than or equal to the suspected prohibited item threshold, and less than the prohibited item similarity threshold, it means that the personal belongings of the person to be inspected are suspected to be prohibited items, and the system will mark them as suspected prohibited items and take corresponding measures for the suspected prohibited items.

5. The flat-panel terahertz human body imaging security inspection system according to claim 4, characterized in that: The way to deal with suspected contraband is: ask the person to be inspected to undergo a second security check. During the second security check, in addition to scanning the front and back of the person to be inspected, both sides of the person to be inspected are scanned and inspected to obtain the second contraband similarity data of the scan and inspection, and compare the second contraband similarity with the first contraband similarity, and make different responses based on the comparison results.

6. The flat-panel terahertz human body imaging security inspection system according to claim 5, characterized in that: When the second similarity of contraband is equal to the first similarity of contraband, it means that the additional scanning on both sides of the person to be inspected has no effect on the similarity of contraband, and this increase cannot make an accurate judgment on the suspected contraband. In this case, manual inspection is carried out; when the second similarity of contraband is greater than the first similarity of contraband, it means that the additional inspection on both sides makes the suspected contraband more suspected. In this case, manual inspection is carried out; when the second similarity of contraband is less than the first similarity of contraband, it means that the additional inspection on both sides makes the suspected contraband less suspected. In this case, it is released.

7. The flat-panel terahertz human body imaging security inspection system according to claim 6, characterized in that: The result data of manual inspection of whether suspected contraband is actually contraband is recorded, and the suspected contraband threshold is dynamically adjusted using the number of times the suspected contraband is processed and the number of times the suspected contraband is determined to be contraband in the result data.

8. The flat-panel terahertz human body imaging security inspection system according to claim 7, characterized in that: The dynamic adjustment method is: within a preset period, obtain all the times of handling suspected contraband and the times of determining that the suspected contraband is a contraband, and take the ratio of the number of times it is determined to be a contraband to the number of times the suspected contraband is handled as the accuracy rate. At the same time, preset an accuracy rate threshold, compare the accuracy rate with the accuracy rate threshold, if the accuracy rate is greater than or equal to the accuracy rate threshold, continue to use this suspected contraband threshold for judgment, if the accuracy rate is less than the accuracy rate threshold, increase the suspected contraband threshold.

9. A flat-plate terahertz human body imaging security inspection device, characterized in that: A flat-panel terahertz human body imaging security inspection system according to any one of claims 1 to 8, comprising a standing board (1), a security inspection instrument body (2) being mounted on the top of the standing board (1), a control box (3) being arranged on the back of the security inspection instrument body (2), a baffle (4) being arranged on the front, a display (5) being arranged on the side, a terahertz wave transmitter (6) being arranged inside, and a driving mechanism (7) for driving the terahertz transmitter (6) to move up and down.

10. 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 flat-panel terahertz human body imaging security inspection system as described in any one of claims 1 to 8.

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