A device and method for testing the image quality of security inspection equipment

Abstract

The present invention provides a device and a method for testing the image quality of security inspection equipment, belonging to the technical field of security inspection equipment testing, and is mainly used for testing the image quality of security inspection equipment. The device for testing the image quality of security inspection equipment includes a bottom plate and a testing component installed on the bottom plate. The testing component includes an image resolution testing component, a material discrimination testing component, a common dangerous and prohibited item testing component, and an equipment operation testing component. The device for testing the image quality of security inspection equipment provided by the present invention is small in volume, light in weight, convenient to operate, inexpensive and general-purpose, and testers can carry out daily detection work of security inspection equipment without special training.

Description

Technical Field

[0001] The present invention belongs to the technical field of security inspection equipment testing, and particularly relates to a device and method for testing the image quality of security inspection equipment. Background Art

[0002] X-ray security inspection equipment is widely used in public places such as airports, railway stations, and freight stations. Such equipment uses the principle of X-ray transmission to image the inspected items, and security inspectors judge the shape and material of the inspected items based on the images. The application of such equipment can effectively prevent the transportation of prohibited and dangerous items and is an important means to ensure security.

[0003] For passenger luggage X-ray security inspection equipment, it is necessary to accurately identify each item in the inspected items according to the shape and material of the inspected items. According to the national standard GB15208.2-2018 "Micro-dose X-ray inspection equipment - Part 2: Transmission type luggage security inspection equipment", when evaluating the performance of X-ray security inspection equipment, line resolution (TEST1), penetration resolution (TEST2), spatial resolution (TEST3), penetration power (TEST4), organic matter resolution (TEST5 and TEST6), mixture resolution (TEST7), inorganic matter resolution (TEST8), etc. become the main performance indicators. The "Appendix A Test Objects" part of the GB15208.2-2018 standard details the test objects for the above indicators. As shown in the appendix Figure 1 、 Figure 2 The above national standard test objects are a set of two, namely the national standard test object A for image resolution and the national standard test object B for material resolution. The volume of each test object is approximately 610mm×450mm×240mm, and the total weight is approximately 20 kg. The national standard test objects are used for the identification test of equipment performance. For example, the penetration power (TEST4) is divided into 10 steel steps with different thicknesses, and the inspector needs to distinguish the thickness of the steel steps that can be resolved on the X-ray equipment image as the test result of this indicator. The complete image index test takes about 2 hours and requires an inspector who has received strict training to judge the images.

[0004] For cargo transportation X-ray security inspection equipment, in accordance with the national standard GB 15208.3-2018, "Micro-dose X-ray inspection equipment - Part 3: Transmission type cargo security inspection equipment", when evaluating the performance of cargo transportation X-ray security inspection equipment, it includes a set of two national standard test bodies, namely the penetration national standard test body A and the comprehensive test national standard test body B. The volume of each test body is approximately 755mm×500mm×250mm, and the total weight is approximately 30kg. The penetration in test body A and the line resolution (TEST1), penetration resolution (TEST2), spatial resolution (TEST3), organic matter resolution (TEST4), mixture resolution (TEST5), inorganic matter resolution (TEST6), etc. in test body B become the main performance indicators. The "Appendix A Test Bodies" section in the GB 15208.3-2018 standard makes detailed regulations on the test bodies for the above indicators, such as Figure 3 and Figure 4 shown. The national standard test bodies are generally used for the identification test of equipment performance. For example, the line resolution (TEST1) is divided into 7 single solid copper wires of different diameters in the shape of a sine wave. The inspector needs to distinguish the distinguishable copper wire specifications on the X-ray equipment image as the test result of this indicator. The complete image index test takes about 2 hours and requires an inspector who has received strict training to judge the images.

[0005] China's civil aviation has always attached great importance to the performance monitoring of security inspection equipment. In addition to setting up professional institutions to carry out identification tests on the performance of security inspection equipment, it also stipulates that the security inspection equipment in use at airports should be subject to daily inspections by ordinary security inspectors. This regulation reflects the industry's emphasis on monitoring the daily operation status of security inspection equipment. Currently, when the security inspection agencies at each airport start up and operate daily, they generally use simple methods such as "passing the luggage frame" and "passing the hand-held detector" to conduct daily inspections on security inspection equipment, lacking scientific, standardized, and unified test devices, resulting in problems such as non-standardized detection tools, unscientific detection methods, and inconsistent evaluation criteria in the daily inspections of civil aviation security inspection equipment. However, there are the following problems when using the national standard test bodies: 1. The international test bodies are large in volume, heavy in weight, and inconvenient to operate. 2. The indicators representing image resolution in the national standard test bodies, such as line resolution and penetration, are composed of multiple groups of test objects. The test personnel need to visually distinguish the completeness of the X-ray images of each group of test objects. The test personnel need to receive strict training and obtain the qualification of an inspector. The test result is a quantitative description of the specific indicators of the equipment's imaging quality. 3. The national standard test bodies are composed of two test bodies, which are suitable for directly reading the specific technical indicators of the equipment, but they are quite different from the common dangerous and prohibited items in actual work and are not intuitive enough. 4. When using the national standard test bodies for testing, each image indicator needs to be carefully distinguished, and the test bodies need to be placed at multiple positions to form images repeatedly, generally taking about 2 hours.

[0006] In summary, the use of national standard test objects has the following problems: large size, heavy weight, inconvenient operation, high requirements for testers, etc. In particular, the image indicators in the national standard are quite different from the dangerous and prohibited items commonly seen in actual work, and are not intuitive enough.

[0007] In addition, X-ray security inspection equipment generally uses electric rollers without frequency converters as the power unit of the conveyor belt. After a period of use, the conveyor belt is prone to deviation, wear and loosening, and the motor may also fail due to heavy objects placed on the conveyor belt. These problems are mainly reflected in the reduction of conveyor belt speed. According to the imaging principle of X-ray security inspection equipment, the reduction of conveyor belt speed will cause image disproportion, and the disproportionate image makes it difficult for security personnel to accurately identify dangerous prohibited items. Summary of the invention

[0008] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art and provide a device for testing the image quality of security inspection equipment, including a base plate and a test component installed on the base plate, the test component including an equipment operation test component, the equipment operation test component including an image ratio test object, and the image ratio test object is used to test whether the imaging ratio of the security inspection equipment is normal.

[0009] Wherein, the image ratio test object is a U-shaped steel plate; one side of the bottom plate is provided with a U-shaped groove for placing the image ratio test object, and when the image ratio test object is inserted into the U-shaped groove, it forms an interference fit with the U-shaped groove.

[0010] Wherein, the test component also includes an image resolution test component, and the image resolution test component includes a detachable line resolution test object and a detachable penetration test object, which are used to test the image resolution of the security inspection equipment.

[0011] Wherein, a rectangular hole is opened on the bottom plate, and the linear resolution test object can be installed in the rectangular hole.

[0012] The line resolution test object includes a copper wire and a small plate, the copper wire is fixed to the small plate, and the small plate is installed at the rectangular hole.

[0013] The test component further includes a material discrimination test component, which includes an organic discrimination test object, a mixture discrimination test object and an inorganic discrimination test object, and is used to test the material discrimination capability of the security inspection equipment.

[0014] Among them, the test component also includes a common dangerous and prohibited items test component, and the common dangerous and prohibited items test component includes any one or any combination of liquid test objects, lithium battery test objects, lighter test objects, powdered solid test objects and knife test objects.

[0015] The present invention also provides a method for testing a security inspection device, including:

[0016] In the first step, according to the test requirements, select the corresponding test components and install the test components on the bottom plate to form a device for testing the image quality of the security inspection device;

[0017] In the second step, place the device for testing the image quality of the security inspection device at the center of the entrance of the X-ray security inspection machine;

[0018] In the third step, start the X-ray security inspection device to image the device for testing the image quality of the security inspection device;

[0019] In the fourth step, judge the imaging quality of the security inspection device according to the X-ray image of the device for testing the image quality of the security inspection device displayed on the display device.

[0020] Among them, the method for judging the imaging quality of the security inspection device includes: for the image ratio test object, judge the use state of the conveyor belt of the security inspection device by whether the image of the image ratio test object displayed on the display device is a square.

[0021] Among them, the method for judging the imaging quality of the security inspection device includes:

[0022] For the line resolution test object and the penetration test object, judge the image resolution of the device by whether the display device can display its complete corresponding shape;

[0023] For the organic matter resolution test object, the mixture resolution test object and the inorganic matter resolution test object, judge the material resolution ability of the device by whether the display device can display its corresponding color;

[0024] For the liquid test object, judge the liquid resolution ability of the device by whether the display device can present the bottle shape, uniform orange color and whether there are liquid surface-like lines inside the bottle;

[0025] For the powdery solid test object, judge the powdery solid resolution ability of the device by whether the display device can present the powdery particle shape and uneven orange color;

[0026] For the lithium battery test object, the lighter test object and the knife test object, judge the specific structure imaging ability of the device by whether the display device can present the lithium battery, lighter and knife structure shapes and material colors.

[0027] Beneficial effects

[0028] The image resolution indexes of the security inspection equipment tested by the present invention, such as line resolution and penetration, are tested by a group of test objects. The imaging quality of the security inspection equipment can be judged only by whether the test personnel can see the test object in the image displayed by the display device. The test result is a qualitative description of whether the imaging quality of the security inspection equipment is usable, which greatly reduces the technical threshold and can be operated by ordinary security inspection personnel. Security inspection equipment used in various scenarios has different line resolution and penetration requirements. This test device can be used to test a variety of security inspection equipment in various application scenarios. It only needs to install detachable test objects of corresponding specifications. It has high versatility and can be mass-produced. The security inspection unit only needs to purchase one set of test devices to meet the testing needs of various types of security inspection equipment in different occasions, so it saves costs.

[0029] The present invention adds a test object for testing whether the image ratio is imbalanced, which can ensure that the security inspection image is true and accurate, and can also judge the use status of the conveyor belt of the security inspection equipment.

[0030] The present invention adds a variety of common dangerous and prohibited items to test, corresponding to the application scenarios in X-ray equipment security inspection work, and is close to actual combat.

[0031] During the test process, the security personnel only need to visually check whether the image of the test object 1-11 is normal, and only place it once at the center of the entrance of the X-ray equipment. Generally, the test time takes about 2 minutes.

[0032] The device for testing the image quality of security inspection equipment provided by the present invention is small in size, light in weight, easy to operate, cheap and universal, and testers can carry out daily inspection work of security inspection equipment without special training.

[0033] The above advantages of the present invention create conditions for daily testing of civil aviation X-ray security inspection equipment. The present invention is used by ordinary security inspectors to perform daily testing after each security inspection equipment startup, which plays an important role in timely discovering equipment performance hazards and ensuring the effectiveness of X-ray equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The national standard test body A for image resolution of passenger baggage X-ray security inspection equipment in the background technology;

[0035] Figure 2 It is the national standard test body B for material discrimination of passenger baggage X-ray security inspection equipment in the background technology;

[0036] Figure 3 The national standard test body A for penetration of cargo transportation X-ray security inspection equipment in the background technology;

[0037] Figure 4 It is the national standard test body B for comprehensive testing of cargo transportation X-ray safety inspection equipment in the background technology;

[0038] Figure 5 This is a schematic structural diagram of the test device in the present application;

[0039] Figure 6 This is a schematic structural diagram of one side of the bottom plate in the present application;

[0040] Figure 7 This is a schematic structural diagram of the other side of the bottom plate in the present application;

[0041] Figure 8 This is a flow chart of the test device for testing security inspection equipment. Specific embodiments

[0042] The present invention will be specifically described below in conjunction with specific embodiments. It is necessary to point out here that the following embodiments are only for further illustration of the present invention and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art to the present invention based on the content of the present invention still fall within the protection scope of the present invention.

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] The security inspection equipment in the device for testing the image quality of security inspection equipment (abbreviation: "test device") provided in this embodiment refers to the X-ray security inspection equipment for passengers' luggage. This security inspection equipment generally includes an X-ray security inspection machine and a display device used in conjunction with it. When a passenger's luggage enters the X-ray security inspection machine, the X-ray in it scans the luggage. When the passenger's luggage is scanned and imaged, the image information will be presented on the above display device, and the security inspection personnel will make a manual or machine judgment on whether there are prohibited items in the passenger's luggage based on the image information.

[0045] To test the image quality of the X-ray security inspection equipment for passengers' luggage, the present invention provides a device for testing the image quality of security inspection equipment, as Figure 5 shown, which includes a bottom plate 12 and a test component installed on the bottom plate 12. The test component includes: an image resolution test component, a material discrimination test component, a common dangerous prohibited item test component, and an equipment operation test component.

[0046] Among them, the image resolution test component includes a line resolution test object 1 and a penetration test object 2, which are used to test the image resolution of the security inspection equipment. Image resolution is an index of the clarity of an image. Generally, the security inspection equipment images multiple silk threads of different thicknesses and steel plates with stepped thicknesses. The outer diameter of the thinnest silk thread that the X-ray can image is the line resolution of the equipment, and the thickness of the thickest steel plate that the X-ray can penetrate is the penetration of the equipment. The combination of these two indicators is called the image resolution index.

[0047] The material discrimination test component includes an organic matter discrimination test object 3, a mixture discrimination test object 4, and an inorganic matter discrimination test object 5, which are used to test the material discrimination ability of security inspection equipment;

[0048] The common dangerous and prohibited item test component includes a liquid test object 6, a lithium battery test object 7, a lighter test object 8, a powdery solid test object 9, and a knife test object 11, which are used to test the imaging ability of security inspection equipment for common dangerous and prohibited items;

[0049] The equipment operation test component includes an image ratio test object 10, which is used to test whether the imaging ratio of the security inspection equipment is normal.

[0050] In order to facilitate security inspectors to identify each test object, a digital mark is set on one side of the corresponding test object on the bottom plate 12. The digital mark is made of a material that can be visually distinguished in the imaging image of the security inspection equipment. The digital mark is fixed to the bottom plate by pasting or other means, and is used for security inspectors to mark and determine which test object it is in the imaging image, so as to judge the imaging quality of the corresponding test object.

[0051] In addition, the structure of the device for testing the image quality of security inspection equipment provided by the present invention can also be used for testing cargo transportation X-ray security inspection equipment, but the size of the device for testing the image quality of security inspection equipment is larger, which will not be elaborated here.

[0052] Specifically, the line resolution test object 1 is mainly a single solid-core copper wire in a sine shape, which is used to test the line resolution of the X-ray security inspection equipment; the diameter of the copper wire can be 0.254mm, 0.203mm, 0.160mm or 0.127mm, etc. The specific value of the diameter can be determined according to the technical standards of different types of security inspection equipment to be detected. Generally, the sizes and specifications of the test objects for testing the line resolution of X-ray security inspection equipment for passengers' luggage are different. In order to adapt to different types of security inspection equipment to be detected, various specifications of line resolution test objects 1 with different copper wire diameters can be provided; the copper wire can be fixed and pasted on an ABS small plate to form the line resolution test object 1. The ABS small plate is installed on the bottom plate 12 through nylon screws. Nylon screws are used here to avoid the influence of metal screws on the copper wire imaging. The specification of the line resolution test object 1 can be changed by removing the nylon screws.

[0053] The penetration test object 2 is a carbon steel block with a length and width of 70mm×70mm, and the thickness can be 25mm, 27mm, 30mm or 32mm, etc. A circular lead block with a thickness of 5mm and a diameter of 25mm is adhered to it. The specific value can be determined according to the technical standards of the security inspection equipment to be detected, and is used to test the penetration of the X-ray security inspection equipment. The penetration test object 2 can be installed on the bottom plate 12 through metal screws, and the specification of the penetration test object 2 can be changed by removing the screws.

[0054] The organic matter resolution test object 3 is a stepped ABS plastic plate. Every 3 plastic plates form 1 set of steps. The length, width and height dimensions of the 3 plastic plates can be: 50mm×35mm×1mm, 50mm×35mm×3mm, 50mm×35mm×5mm respectively, and it is used to test the organic matter resolution of the X-ray security inspection equipment. The organic matter resolution test object 3 can be directly bonded and fixed to the bottom plate 12 with glue.

[0055] The mixture resolution test object 4 is a stepped alloy aluminum block. Every 3 alloy aluminum blocks are 1 set of steps. The length, width and height dimensions of the 3 alloy aluminum blocks can be: 50mm×35mm×5mm, 50mm×35mm×13mm, 50mm×35mm×20mm respectively, and it is used to test the mixture resolution of the X-ray security inspection equipment. The mixture resolution test object 4 can be installed on the bottom plate 12 with metal screws, and the specification of the mixture resolution test object 4 can be replaced by removing the screws.

[0056] The inorganic matter resolution test object 5 is a stepped steel block. Every 3 steel blocks are 1 set of steps. The length, width and height dimensions of the 3 steel blocks can be: 50mm×35mm×4mm, 50mm×35mm×7mm, 50mm×35mm×10mm respectively, and it is used to test the inorganic matter resolution of the X-ray security inspection equipment. The inorganic matter resolution test object 5 can be fixed and installed on the bottom plate 12 with metal screws, and the specification of the inorganic matter resolution test object 5 can be replaced by removing the screws.

[0057] The organic matter resolution test object 3, the mixture resolution test object 4 and the inorganic matter resolution test object 5 all adopt a stepped structure, in order to test whether different depths of colors can be seen for steps with different thicknesses and whether the step boundaries can be distinguished when testing the security inspection equipment, so as to judge its imaging quality.

[0058] The liquid test object 6 is a plastic bottle, and 100 ml of water is contained in the plastic bottle, which is used to test the imaging ability of the X-ray security inspection equipment for liquids.

[0059] The lithium battery test object 7 is a cylindrical and sheet lithium battery, which is used to test the imaging ability of the X-ray security inspection equipment for lithium batteries.

[0060] The lighter test object 8 includes a pulley lighter and a push-button lighter, which are used to test the imaging ability of the X-ray security inspection equipment for lighters.

[0061] The powdery solid test object 9 is 100 g of milk powder, which is used to test the imaging ability of the X-ray security inspection equipment for powdery solids.

[0062] The image ratio test object 10 is a square-shaped 1Cr17 stainless steel plate with an outer dimension of 180 mm × 180 mm, an inner dimension of 140 mm × 140 mm, and a thickness of 1 mm, which is used to test whether the image ratio presented by the X-ray security inspection equipment is normal.

[0063] The knife test object 11 includes a stainless steel knife and a ceramic knife with a blade length of 60 mm, which is used to test the imaging ability of the X-ray security inspection equipment for knives.

[0064] Among them, common dangerous goods such as the liquid test object 6, the lithium battery test object 7, the lighter test object 8, the powdery solid test object 9, and the knife test object 11 can be placed in plastic small boxes of corresponding sizes, and the plastic small boxes are fixed to the bottom plate 12 through nylon screws.

[0065] Such as Figure 6 、 Figure 7 As shown, the bottom plate 12 is a rectangular ABS plate, and a rectangular hole 13 is opened on the bottom plate 12. The rectangular hole 13 is the reserved position for the line resolution test object 1. Different specifications of the line resolution test object 1 need to be replaced when testing different types of equipment with this test device. Since the line resolution test object 1 uses relatively thin copper wires, in the prior art, the copper wires are directly fixed to the bottom plate 12 by being snapped in or pasted, and such a connection method is not easy to replace the test object at any time. In this embodiment, the copper wires are fixed and pasted on a small ABS plate with glue, and then the small ABS plate is fixed to the bottom plate 12. Because the diameter of the copper wire is small, if the X-ray passes through the two layers of the small ABS plate and the bottom plate 12 to image the copper wire, it is very likely to cause unclear imaging or even no imaging. Therefore, a rectangular hole 13 is opened at the position where the line resolution test object 1 is set on the bottom plate 12, and the small ABS plate of the line resolution test object 1 is placed at the position of the rectangular hole and installed on the bottom plate 12 through 4 screw holes on both sides of the rectangular hole with nylon screws. All the test objects of the entire test device can be replaced to adapt to different types of security inspection equipment and increase the versatility.

[0066] A square-shaped groove 14 is opened on one side of the bottom plate 12 for placing the image ratio test object 10; the width of the square-shaped groove 14 can be slightly smaller than the width of the stainless steel plate of the image ratio test object 10 that is snapped into it, so as to form an interference fit to fix the image ratio test object 10 when the image ratio test object 10 is snapped into it.

[0067] In addition, there are no special requirements for the layout positions of the test objects on the bottom plate 12, and it is only necessary to be able to reasonably install all of them on the bottom plate 12.

[0068] Such as Figure 8 As shown, the specific test method for testing the security inspection equipment with the test device includes the following operation steps:

[0069] First step, according to the test requirements of different types of security inspection equipment, select the corresponding test components and install the test components on the bottom plate to form a device for testing the image quality of security inspection equipment;

[0070] Second step, place the device for testing the image quality of security inspection equipment at the center of the entrance of the X-ray security inspection machine;

[0071] Third step, start the X-ray security inspection equipment to image the device for testing the image quality of security inspection equipment;

[0072] Fourth step, judge the imaging quality of the security inspection equipment according to the X-ray image of the device for testing the image quality of security inspection equipment in the display device, specifically as follows:

[0073] For the line resolution test object 1 and the penetration test object 2 that characterize the image resolution of the device, judge the image resolution of the device by whether the display device can display their complete corresponding shapes.

[0074] For the organic matter resolution test object 3, the mixture resolution test object 4 and the inorganic matter resolution test object 5 that characterize the material resolution ability of the device, judge the material resolution ability of the device by whether the display device can display their corresponding colors.

[0075] For characterizing the imaging ability of the device for common dangerous and prohibited items, among which for the liquid test object 6, judge the liquid resolution ability of the device by whether the display device can present the bottle shape, uniform orange color and whether there are liquid surface-like lines inside the bottle. For the powdery solid test object 9, judge the powdery solid resolution ability of the device by whether the display device can present the powdery particle shape and uneven orange color. For the lithium battery test object 7, the lighter test object 8 and the knife test object 11, judge the specific structure imaging ability of the device by whether the display device can present the lithium battery, lighter and knife structure shapes and material colors.

[0076] For the image ratio test object 10 that represents the imaging ratio of the device, judge the usage status of the conveyor belt of the security inspection equipment by whether the image presented by the display device is a square. If it is considered abnormal, the length-width ratio can be measured on the image with a ruler, and if the length-width ratio exceeds 10%, it can be judged as a conveyor belt failure.

[0077] The above description is only for implementing the embodiments of the present invention. Those skilled in the art should understand that any modification or partial replacement without departing from the scope of the present invention should fall within the scope defined by the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A device for testing the image quality of security inspection equipment, comprising a bottom plate and a testing component mounted on the bottom plate. The testing component includes an equipment operation testing component, and the equipment operation testing component includes an image ratio test object for testing whether the imaging ratio of the security inspection equipment is normal. The image ratio test object is a square-shaped steel plate. An open square-shaped groove for placing the image ratio test object is formed on one side of the bottom plate. When the image ratio test object is snapped into the square-shaped groove, it is in interference fit with the square-shaped groove. The testing component further includes an image resolution testing component, which includes a detachable line resolution test object and a detachable penetration test object for testing the image resolution of the security inspection equipment. A rectangular hole is formed on the bottom plate, and the line resolution test object can be mounted at the rectangular hole. The testing component further includes a material discrimination testing component, which includes an organic matter discrimination test object, a mixture discrimination test object, and an inorganic matter discrimination test object for testing the material discrimination ability of the security inspection equipment.

2. The device for testing the image quality of security inspection equipment according to claim 1, wherein: The line resolution test object includes a copper wire and a small plate. The copper wire is fixed to the small plate, and the small plate is mounted at the rectangular hole.

3. The device for testing the image quality of security inspection equipment according to claim 1, characterized in that: The testing component further includes a common dangerous and prohibited items testing component, which includes any one or several of a liquid test object, a lithium battery test object, a lighter test object, a powdery solid test object, and a knife test object.

4. A test method for security inspection equipment, wherein the test method uses the device for testing the image quality of security inspection equipment according to any one of claims 1-3, characterized in that: The testing method includes: First step, according to the testing requirements, select the corresponding testing component and mount the testing component on the bottom plate to form a device for testing the image quality of the security inspection equipment. Second step, place the device for testing the image quality of the security inspection equipment at the center of the entrance of the X-ray security inspection machine. Second step, start the X-ray security inspection equipment to image the device for testing the image quality of the security inspection equipment. Third step, according to the X-ray image of the device for testing the image quality of the security inspection equipment displayed on the display device, judge the imaging quality of the security inspection equipment.

5. The test method of the security inspection device according to claim 4, characterized in that: The method for judging the imaging quality of the security inspection equipment includes: for the image ratio test object, judge the use status of the conveyor belt of the security inspection equipment by whether the image of the image ratio test object displayed on the display device is a square.

6. The test method of the security inspection device according to claim 5, wherein: The method for judging the imaging quality of the security inspection equipment includes: For the line resolution test object and the penetration test object, judge the image resolution of the equipment by whether the display device can display their complete corresponding shapes. For the organic matter discrimination test object, the mixture discrimination test object, and the inorganic matter discrimination test object, judge the material discrimination ability of the equipment by whether the display device can display their corresponding colors. For the liquid test object, judge the liquid discrimination ability of the equipment by whether the display device can present the shape of the bottle, uniform orange color, and whether there are liquid surface-like lines inside the bottle. For the powdery solid test object, judge the powdery solid discrimination ability of the equipment by whether the display device can present the shape of powdery particles and uneven orange color. For lithium battery test objects, lighter test objects, and knife test objects, determine the specific structural imaging ability of the device by whether the display device can present the structural shapes and material colors of lithium batteries, lighters, and knives.

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