CN110531435B - Test box and test method for testing contraband detection algorithm - Google Patents
Test box and test method for testing contraband detection algorithm Download PDFInfo
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- CN110531435B CN110531435B CN201910809301.1A CN201910809301A CN110531435B CN 110531435 B CN110531435 B CN 110531435B CN 201910809301 A CN201910809301 A CN 201910809301A CN 110531435 B CN110531435 B CN 110531435B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
- G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
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Abstract
The invention discloses a test box for testing a contraband detection algorithm, which comprises a box body, a contraband gasket, a contraband, a shielding body gasket and a shielding body, wherein the box body is provided with a plurality of detection units; wherein, a plurality of grooves for placing contraband are arranged in the contraband liner; the shielding body liner is arranged above the contraband liner, a plurality of grooves used for placing shielding bodies are formed in the shielding body liner, shielding bodies made of one material are placed in each groove, and one or more stacked shielding bodies are placed in each groove. The test box fully considers the types and the postures of various contraband, abstracts a large amount of contraband samples for testing into typical contraband, simulates shielding during detection of the contraband by using shielding bodies of several typical materials, reduces the test quantity and simplifies the test flow. By using a single or a plurality of test boxes to detect the contraband detection algorithm, whether the contraband detection algorithm has a corresponding contraband detection function can be rapidly judged.
Description
Technical Field
The invention relates to a test box for testing a contraband detection algorithm, and also relates to a test method for testing the contraband detection algorithm.
Background
In public places with high safety level requirements such as airports, railways, important gatherings and the like, the use of X-ray security inspection equipment for security inspection of luggage items carried by personnel has become a common practice in various countries. For many years, security inspection manufacturers have been struggling to develop technologies for detecting solid and liquid inflammable and explosive dangerous goods, security inspection has been greatly progressed in the aspect of detection, and meanwhile, the tests of solid and liquid explosive detection equipment approved by international authorities are mature. However, in the security inspection line, various contraband products except solid and liquid blasting objects are common, such as simulated firearms, control cutters, lighters, dangerous tools, blasting connection devices and the like. The research of various factories in the detection of contraband is also very popular. For example, the technology disclosed in the utility model patent application CN107145898a and the chinese utility model CN206192923U can be based on the model for detecting various contraband in the way of convolutional neural network training in deep learning; disclosed in the patent application publication CN103744120a is a method for detecting various contraband by fusing various conventional image features; disclosed in the patent application publication CN108303747a is a model of a probe firearm based on individual training of convolutional neural networks in deep learning. However, none of these patent documents gives an index for measuring the detection capability of the contraband detection algorithm, and the detection capability of various contraband detection algorithms cannot be quantitatively tested.
For detection of detection algorithm capability, the U.S. TSA (Transportation Security Administration, U.S. Federal transportation safety administration) provides authoritative certification for equipment with automatic detection technology of solid explosive, the European Union ECAC (European Civil Aviation Conference ) provides authoritative certification for equipment with automatic detection technology of solid and liquid explosive, and the equipment has complete testing methods and systems and is approved by the international market. The national civil aviation bureau provides authentication for equipment with the automatic detection technology of solid explosive, and is a necessary condition for the equipment to enter the market in China. The above-mentioned multiple mechanisms can detect the equipment of the automatic detection technology of solid and liquid explosive, but at present, no mechanism can provide authentication for the equipment with the detection technology of contraband at home and abroad, and the detection technology in this aspect is still blank.
In addition, in chinese patent applications with publication numbers CN108181328 and CN109870730, a test box, a test principle and a test method for detecting the line resolution, the space resolution, the penetration resolution and the material resolution of the X-ray security inspection device are also disclosed, respectively, and the test box can be used for detecting the image quality of the X-ray security inspection device. However, at present, no mechanism at home and abroad has disclosed a technology for detecting the detection capability of the contraband detection algorithm by using a special test box, and the test box used in the aspect also belongs to the technical blank.
Disclosure of Invention
The invention aims to provide a test box for testing a contraband detection algorithm.
The invention aims to provide a testing method for testing a contraband detection algorithm, which is based on the testing box to realize testing.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
According to a first aspect of an embodiment of the present invention, there is provided a test box for testing a contraband detection algorithm, comprising a box body, a contraband pad, a contraband, a barrier pad and a barrier;
The contraband pad is arranged on the lower layer inside the box body, and a plurality of grooves for placing contraband are formed in the contraband pad; the shielding body gasket is arranged above the contraband gasket, one or more grooves for placing shielding bodies are formed in the shielding body gasket, shielding bodies made of one material are placed in each groove, and one or more stacked shielding bodies are placed in each groove.
Wherein, preferably, the shielding body comprises any one or more of an organic glass shielding body, an aluminum plate shielding body and a steel plate shielding body.
Wherein preferably, when the shielding body liner is simultaneously provided with shielding bodies made of multiple materials, the thicknesses of the shielding bodies made of multiple materials are different.
Wherein preferably a plurality of shutters stacked in each recess correspond to different sizes, respectively.
Wherein, preferably, three grooves for placing the shielding bodies are arranged in the shielding body liner, three shielding bodies made of the same material are arranged in each groove, and the thickness of each organic glass plate shielding body is between 25mm and 35 mm; the thickness of each aluminum plate shielding body is between 4mm and 6 mm; the thickness of the large-size steel plate shielding body is between 2.5 and 3.5mm, and the thickness of the medium-size and small-size steel plate shielding body is between 1.5 and 2.5 mm.
Wherein preferably a plurality of said contraband placed in the same box corresponds to the same kind of contraband of the following kind: simulation gun and parts, control cutters, lighter contraband, dangerous tools or explosion contraband.
Wherein preferably a plurality of said contraband placed in the same box corresponds to a plurality of the following categories of contraband: simulation gun and parts, control cutters, lighter contraband, dangerous tools or explosion contraband.
Wherein preferably, a plurality of said contraband placed in the same box comprises contraband having a plurality of poses.
Preferably, the contraband is abstracted into a cuboid with long sides, short sides and high, and the cuboid is placed on the orthogonal plane of the ray fan in different modes to form five different postures:
Posture one: the plane formed by long sides and short sides of the cuboid is arranged on the orthogonal plane of the ray fan;
Posture II: the short side of the cuboid contacts with the orthogonal plane of the ray fan, and the included angle between the plane formed by the long side and the short side of the cuboid and the orthogonal plane of the ray fan is 45 degrees;
posture III: the cuboid plane formed by the short side and the high side is arranged on the orthogonal plane of the ray fan;
posture IV: the cuboid plane formed by long sides and high sides is arranged on the orthogonal plane of the ray fan surface;
posture five: the height of the cuboid contacts with the orthogonal plane of the ray fan, and the included angle between the plane formed by the height and the long side of the cuboid and the orthogonal plane of the ray fan is 45 degrees.
Wherein, preferably, the box body is a cuboid box body with a pull rod and made of high-strength ABS materials, and the contraband gasket and the shielding body gasket are made of EVA sponge materials.
According to a second aspect of the embodiment of the present invention, there is provided a testing method implemented based on the above-mentioned testing box, for testing a contraband detection algorithm, including the steps of:
(1) Acquiring X-ray images of one or more test boxes corresponding to the detection functions to be tested by the contraband detection algorithm under different shielding scenes according to the detection functions to be tested by the contraband detection algorithm;
(2) Detecting and identifying the X-ray image acquired in the step (1) by using the contraband detection algorithm to acquire the number of correctly identified contraband in each shielding scene;
(3) Comparing the number of the contraband correctly identified in the step (2) with a preset threshold, and when the number of the contraband correctly identified in all the shielding scenes is equal to or larger than the preset threshold, enabling the contraband detection algorithm to have a corresponding detection function, otherwise, judging that the contraband detection algorithm does not have the corresponding detection function.
Wherein preferably, in the step (1), one or more of a gun test box, a control tool test box, a lighter test box, a dangerous tool test box and a comprehensive posture test box is selected according to the detection function to be tested by the detection algorithm, and then an X-ray image corresponding to the selected test box is acquired.
Wherein preferably, the X-ray image of the test box acquired in the step (1) is a pre-stored X-ray image of the test box, or the acquired X-ray image of the test box is an X-ray image acquired in real time by using a detection device running the contraband detection algorithm.
Wherein preferably, the X-ray image of the test box acquired in the step (1) includes X-ray images of the test box acquired in a simple scene without using a shutter, a general complex scene using a large-sized shutter, and a complex scene using three layers of shutters simultaneously, respectively.
And (2) judging whether the contraband is correctly identified in the step (2) is that the intersection ratio of the prediction frame and the standard frame is more than 50% under the condition that the class identification is correct.
Preferably, the threshold values preset in the different occlusion scenes in the step (3) are as follows: the threshold value of the simple scene is not less than 80% of the total amount of contraband in the test box, the threshold value of the complex scene is not less than 60% of the total amount of contraband in the test box, the threshold value of the complex scene is not less than 50% of the total amount of contraband in the test box, and the number of correctly identified contraband in all shielding scenes is not less than 65% of the total amount of contraband in the test box.
The test box provided by the invention fully considers the types and the placement postures of various contraband, abstracts a massive contraband sample for testing into typical contraband, and simulates the shielding scene when detecting the contraband by using the shielding bodies with several typical materials, thereby reducing the test quantity and simplifying the test flow. The method comprises the steps of taking one or more test boxes provided by the invention as a detected object, acquiring image data of the test boxes, detecting and identifying X-ray images of the test boxes by using a contraband detection algorithm, and comparing the number of contraband correctly identified by the contraband detection algorithm with a preset threshold value to quickly confirm whether the contraband detection algorithm has a corresponding detection function, thereby simplifying the test flow, achieving the purpose of preliminary screening, avoiding the test of directly organizing large samples, and saving manpower and material resources.
Drawings
FIG. 1 is a schematic diagram of a test box according to the present invention;
fig. 2A is a schematic diagram of the structure of the underlying contraband pad in the firearm test box;
FIG. 2B is a schematic diagram of the structure of the lower contraband liner in the regulated tool test box;
Fig. 2C is a schematic diagram of the structure of the lower contraband pad in the lighter test box;
FIG. 2D is a schematic diagram of the structure of the underlying contraband pad in the hazardous tool test kit;
FIG. 2E is a schematic diagram of the structure of the lower contraband pad in the integrated attitude test box;
fig. 3A, 3B, 3C, 3D and 3E are schematic diagrams of five contraband pose, respectively;
FIG. 4A is a visible light photograph of a variety of simulated firearms contained in a firearm test case;
FIG. 4B is a visible light photograph of various control tools contained in the control tool test box;
Fig. 4C is a visible light photograph of various lighter-type contraband articles contained in a lighter test case;
FIG. 4D is a visible light photograph of a plurality of hazard tools contained in a hazard tool test box;
FIG. 4E is a visible light photograph of contraband with different poses in the integrated pose test box;
FIG. 5 is a schematic view of the structure of the upper layer of the shield liner in the test box;
fig. 6A, 6B and 6C are schematic structural views of a plexiglass shield, an aluminum plate shield and a steel plate shield, respectively;
FIGS. 7A, 7B and 7C are X-ray images obtained by a firearm test case in a simple scene, a generally complex scene and a complex scene, respectively;
8A, 8B and 8C are X-ray images obtained by a regulated tool test box in a simple scene, a generally complex scene and a complex scene, respectively;
Fig. 9A, 9B and 9C are X-ray images of a lighter test box obtained in a simple scene, a generally complex scene and a complex scene, respectively;
FIGS. 10A, 10B and 10C are X-ray images of a hazardous tool test kit acquired in a simple scene, a generally complex scene and a complex scene, respectively;
FIGS. 11A, 11B and 11C are X-ray images obtained by the integrated attitude test box in a simple scene, a generally complex scene and a complex scene, respectively;
FIG. 12 is an X-ray image of the first embodiment of the mode of operation and the test box selected;
FIG. 13 is a schematic diagram of the cross-correlation of the predicted frame and the standard frame in the test method according to the present invention;
Fig. 14 is an X-ray image of the second embodiment mode of operation and the selected test box.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings and specific embodiments.
The contraband related to the patent application is specific, and refers to articles with certain material characteristics and shape characteristics, such as guns and parts, various control cutters, lighters, various fire types, dangerous tools, dangerous hydraulic gas tanks, detonators, simulated explosion devices and the like, which are forbidden to be carried by public transportation security inspection.
Through research on security inspection equipment contraband detection algorithms and exploration of related detection methods in recent years, it is considered that inspection of detection capability of the contraband detection algorithms should be mainly examined from three aspects. Firstly, the detection of the article to be detected is that whether a contraband detection algorithm knows the article to be detected under the air background; secondly, detecting the object to be detected under different projection angles, wherein the projection angle imaging of the object to be detected is greatly different from the common form of the object to be detected due to the placing posture of the object to be detected, which causes difficulty to a detection algorithm; thirdly, the shielding problem caused by overlapping of the object to be detected and the background has influence on imaging of the object to be detected due to the background of various materials in the detection method, and the difficulty is also caused to the detection algorithm, so that the shielding of the object to be detected and the shielding degree are considered comprehensively. However, due to the wide variety and diversity of contraband and the complex and varied shape of the baggage packages in which they are contained, the number of complete test sets is massive, resulting in a significant cost of testing the detection capabilities of the contraband detection algorithm.
The invention provides a set of test boxes respectively comprising different contraband from three aspects affecting the detection capability of a contraband detection algorithm by abstracting complex and changeable test cases into general typical conditions, and simultaneously provides a test method realized by using the test boxes, thereby reducing the test quantity and simplifying the test flow. By using a single or a plurality of test boxes to detect the contraband detection algorithm, whether the contraband detection algorithm has the function of detecting certain contraband or not can be quickly and preliminarily confirmed.
First, a test box for testing a contraband detection algorithm provided by the present invention will be described. In the set of test boxes provided by the invention, the diversity of contraband and the placing posture of the contraband are fully considered, massive contraband samples for testing are abstracted into typical contraband, and shielding scenes common in detection of the contraband are simulated by using shielding bodies of several typical materials, so that the test quantity is reduced, and the test flow is simplified.
In the set of test boxes, the test boxes for containing different contraband products are arranged according to different kinds of the contraband products. For example, a test box is provided, in which simulated guns and parts, control cutters, lighter-type contraband, dangerous tools or explosion-type contraband are placed respectively. Therefore, a single test box can be used for correspondingly detecting whether the contraband detection algorithm has a certain detection function or not. Of course, multiple test boxes can be used to comprehensively detect whether the contraband detection algorithm has some detection functions. In consideration of the test cost, various contraband can be placed in the same test box, and the comprehensive identification capacity of the contraband detection algorithm can be detected.
As shown in fig. 1, the test box for testing a contraband detection algorithm provided by the invention comprises a box body 1, a contraband liner 2, a contraband 3, a shielding body liner 4 and a shielding body 5. The contraband liner 2 is arranged at the lower layer inside the box body 1, a plurality of grooves for placing contraband 3 are arranged in the contraband liner 2, and the contraband 3 is placed in the grooves of the contraband liner 2; the shielding gasket 4 is arranged above the contraband gasket 2, one or more grooves for placing shielding bodies 5 are arranged in the shielding gasket 4, one material shielding body 5 is placed in each groove, and one or more stacked shielding bodies 5 are placed in each groove.
Specifically, the shell box body 1 of the set of test box is a cuboid box body with a pull rod, which is made of high-strength ABS materials. The box body is selected because the box body is regular in shape, high in utilization rate of internal space, waterproof and wear-resistant; in addition, ABS belongs to one of plastics, has low X-ray absorptivity and small imaging influence on foreground objects, and is also a common manufacturing material for various traveling cases.
The inside of the box body 1 of the set of test box is provided with two customized gaskets with grooves: a contraband pad 2 and a barrier pad 4. The contraband pad 2 is arranged at the lower layer inside the box body 1 and is used for placing the contraband 3; the lower contraband liner 2 is milled with grooves according to the size of the contraband 3 and the contraband 3 is inlaid into the liner for fixation. The shielding body liner 4 is arranged on the upper layer in the box body 1 and above the contraband liner 2 and is used for placing the shielding body 5; the upper layer shielding body lining 4 mills grooves according to the size of the shielding body 5 and embeds the shielding body 5 into the lining for fixation. The contraband pad 2 and the shielding body pad 4 are made of EVA sponge materials, and have good supporting effect on the shielding body 5 and the contraband 3 which are contained in the inner part.
The contraband 3 used in the test box comprises a simulation pistol, parts, a control cutter, a lighter, a dangerous tool, a simulation detonator, a simulation explosion device and the like. Preferably, the plurality of contraband placed in the same box corresponds to the same kind of contraband in the following categories: simulation gun and parts, control cutters, lighter contraband, dangerous tools or explosion contraband. Of course, according to the actual situation, the situation that multiple contraband products are placed in the same box is not excluded.
In the embodiment of the invention, the set of test boxes comprises 5 different test boxes according to the type of contraband 3 placed in the box body 1 and the placing posture of the contraband: gun test box, control cutter test box, lighter test box, dangerous tool test box and integrated gesture test box. Contraband 3 is placed in milling grooves of customized liners at the lower layer of the test box provided by the invention in different categories, each contraband liner 2 is milled with grooves according to the size of the contraband 3 and is embedded into the liner for fixation, and each groove is provided with two small grooves which are convenient for gripping the contraband 3. Wherein, fig. 2A is a schematic structural diagram of a lower contraband liner in a firearm test box for placing simulated firearms and parts; FIG. 2B is a schematic diagram of the structure of the lower contraband liner in the control knife test box for placing the control knife; fig. 2C is a schematic diagram of the lower contraband gasket in the lighter test box for placing lighter-like contraband, such as lighter, can lighter gasoline, etc.; FIG. 2D is a schematic diagram of the underlying contraband pad in the hazardous tool test kit for placement of hazardous tools, e.g., electric shockers, handcuffs, police whips, etc.; fig. 2E is a schematic diagram of the structure of the lower contraband pad in the integrated attitude test box for placing various contraband with different attitudes, such as simulated guns, control cutters, electric shockers, simulated electric detonators, etc. with different attitudes. The contraband pads are designed in the above figures taking only some of the physical objects of the various contraband as examples, and the above figures are not meant to limit the invention. The number of each test box is not limited to one, and a plurality of similar contraband gaskets can be designed according to actual requirements for manufacturing the test boxes.
In designing the contraband pad 2, the influence of the pose of the contraband 3 on the detection ability of the contraband detection algorithm is also considered in addition to the kind of contraband 3 placed in the different test boxes. The plurality of contraband 3 placed in the same box 1 may include contraband having a plurality of postures, such as the above-described integrated posture test box, and contraband having a plurality of postures may be provided in other test boxes.
The influence of the pose of contraband on the projection angle is determined by the included angle between the contraband placement surface and the orthogonal plane P1 of the ray fan surface. The ray fan orthogonal plane P1 is a plane orthogonal to the ray fan, and is generally a horizontal plane. In fig. 3A to 3E, the ray sector is a scanning plane formed by rays emitted from the rotating ray source O, and is shown as a sector formed by two rays. According to the invention, 5 different postures are designed according to the angular relation between the contraband placing surface and the orthogonal plane of the ray fan surface (see fig. 3A to 3E), and the 5 postures are generated according to the angle of the ray source by different types of equipment.
The contraband is abstracted to a cuboid with long sides a, short sides b and high c, wherein any two of the long sides a, short sides b and high c may be equal. The following describes the posture of an abstract rectangular parallelepiped by taking a rectangular parallelepiped with long side a > short side b > high c as an example. The square column with long side a=short side b and the cube with long side a=short side b=high c can be treated as a cuboid with a specific length, and the abstract posture is simplified.
Specifically, as shown in fig. 3A to 3E, the rectangular parallelepiped is placed on the orthogonal plane P1 of the ray fan plane in different ways, forming five different attitudes. Fig. 3A is a posture one in which a plane S1 of a rectangular parallelepiped composed of a long side a and a short side b is placed on a ray fan plane orthogonal P1. Fig. 3B shows a second posture, which is a posture obtained by rotating a rectangular parallelepiped having a first posture by 45 degrees counterclockwise around the short side B on the orthogonal plane P1 of the ray sector; in this posture, the short side b of the rectangular parallelepiped is in contact with the ray fan plane P1, the angle between the plane S1 of the rectangular parallelepiped composed of the long side a and the short side b and the ray fan plane P1 is 45 degrees, and at this time, the angle between the plane S3 of the rectangular parallelepiped composed of the short side b and the high c and the ray fan plane P1 is 45 degrees, and the plane S2 of the rectangular parallelepiped composed of the high c and the long side a is perpendicular to the ray fan plane P1. Fig. 3C is a posture three, which is a posture obtained by rotating a rectangular parallelepiped having a posture one by 90 degrees counterclockwise around the short side b on the ray fan plane orthogonal P1; in this posture, a plane S3 of the rectangular parallelepiped composed of the short sides b and the high c is placed on the ray fan orthogonal plane P1. Fig. 3D is a posture four, which is a posture obtained by rotating a cuboid having a posture three by 90 degrees clockwise around a height c on a ray fan plane P1; in this posture, a plane S2 of the rectangular parallelepiped composed of the long side a and the high side c is placed on the ray fan plane orthogonal plane P1. Fig. 3E is a posture five, which is a posture obtained by rotating a rectangular parallelepiped having a posture four by 45 degrees counterclockwise around a height c on a ray fan plane orthogonal P1; in this posture, the height c of the cuboid contacts with the ray fan orthogonal plane P1, the included angle between the plane S2 formed by the height c and the long side a of the cuboid and the ray fan orthogonal plane P1 is 45 degrees, at this time, the included angle between the plane S3 formed by the height c and the short side b of the cuboid and the ray fan orthogonal plane P1 is 45 degrees, and the plane S1 formed by the long side a and the short side b of the cuboid is perpendicular to the ray fan orthogonal plane P1.
A set of test boxes are exemplarily set up, wherein each test box selectively places a representative contraband, and referring specifically to table 1, the serial numbers in the column of the pose in table 1 represent the pose serial numbers in the contraband placement poses shown in fig. 3A to 3E.
Table 1 contraband category, number and pose in each test box
Fig. 4A to 4E are respectively pictorial representations of the contraband 3 in each test box, which are provided in the lower layer contraband pad 2.
In the box body 1 of the test box, a shielding body liner 4 is further arranged above the contraband liner 2, and shielding of common shielding objects (such as fabrics, fruits, liquid, notebook computers, large-scale electronic equipment and the like) in reality is simulated by placing shielding bodies with different materials and different thicknesses in the shielding body liner 4. The shielding body liner 4 can be provided with only one shielding body made of one material, or can be provided with shielding bodies made of multiple materials at the same time, and the shielding body made of each material can simulate multiple real objects. In order to better simulate a real shielding scene and simplify a test flow, shielding bodies made of multiple materials are preferably arranged in the same box body for simulation.
Typically, the shutter 5 provided in the shutter liner 4 may include any one or more of a plexiglass shutter, an aluminum plate shutter, and a steel plate shutter. When the shielding body 5 of various materials is simultaneously arranged in the shielding body pad 4, the shielding bodies 5 of various materials are arranged side by side, and the shielding bodies 5 of various materials respectively use different thicknesses. When a plurality of shielding bodies 5 made of the same material are stacked in each groove, the shielding bodies 5 made of the same material are respectively corresponding to different sizes.
The preferred thicknesses of the three above-mentioned shades are given below only approximately for shades in common carry-on luggage. When three shielding bodies made of the same material are placed in each groove, the thickness of each organic glass plate shielding body is between 25mm and 35 mm; the thickness of each aluminum plate shielding body is between 4mm and 6 mm; the thickness of the large-size steel plate shielding body is between 2.5 and 3.5mm, and the thickness of the medium-size and small-size steel plate shielding body is between 1.5 and 2.5 mm.
As shown in fig. 5, in the embodiment of the invention, 3 recesses for placing the shutters 5 are provided side by side in the shutter liner 4. The size of each groove is 180mm multiplied by 380mm multiplied by 100mm, and each groove is provided with two small grooves which are convenient for grabbing the shielding body. The shutters placed in the different grooves are used for shielding contraband 3 placed in different positions in the contraband gasket 2, respectively. A shielding body made of one material is placed in each groove, and one or more stacked shielding bodies can be placed in each groove. Through combining the shielding bodies with different materials and different thicknesses, the common shielding object in reality can be simulated.
Three different material shutters are shown in fig. 6A-6C, and three shutters of each material are shown corresponding to three sizes, large, medium, and small, respectively. The thickness of the three materials of the shielding body is different, and the thickness of each material corresponding to the shielding body with different sizes can also be different.
Shown in fig. 6A is a plexiglass shield, shown in fig. 6B is an aluminum plate shield, and shown in fig. 6C is a steel plate shield. Wherein the three plastic glazing panel shutters shown in FIG. 6A are 180mm by 380mm by 30mm, 180mm by 250mm by 30mm, 180mm by 120mm by 30mm, respectively; the three aluminum plate shields shown in FIG. 6B were 180mm by 380mm by 5mm, 180mm by 250mm by 5mm, and 180mm by 120mm by 5mm, respectively, and the three steel plate shields shown in FIG. 6C were 180mm by 380mm by 3mm, 180mm by 250mm by 2mm, and 180mm by 120mm by 2mm, respectively. The thickness of the shielding body is approximately determined according to the actual effect of the simulation actual shielding object.
During testing, three shielding bodies of the same material in fig. 6A to 6C can be placed in the same groove of the shielding body gasket from top to bottom according to the need, and simulation of different shielding scenes can be realized according to different placement conditions of the three shielding bodies. When three shielding bodies are placed in the same groove of the shielding body gasket from top to bottom, the shielding body with the largest size is placed at the lowest layer, the shielding body with the next size is placed at the middle layer, the shielding body with the smallest size is placed at the uppermost layer, and meanwhile, the three shielding bodies are aligned to the hinge of the upper cover of the box body.
Fig. 7A to 7C show X-ray images obtained for a firearm test box in a simple scene without an occlusion, in a generally complex scene with one layer of occlusion, and in a complex scene with three layers of occlusion, respectively. Fig. 8A to 8C show X-ray images obtained by the regulated tool test box in a simple scene without occlusion, in a generally complex scene with one layer of occlusion and in a complex scene with three layers of occlusion, respectively. Fig. 9A-9C show X-ray images obtained for a lighter test box in a simple scene without occlusion, in a generally complex scene with one layer of occlusion, and in a complex scene with three layers of occlusion, respectively. 10A-10C respectively show X-ray images obtained for a hazard tool test box in a simple scene without occlusion, in a generally complex scene with one layer of occlusion, and in a complex scene with three layers of occlusion. Fig. 11A to 11C show X-ray images obtained by the integrated pose test box in a simple scene without occlusion, in a general complex scene with one layer of occlusion, and in a complex scene with three layers of occlusion, respectively. From the above X-ray image, it can be seen that the shielding effect of the shielding bodies 5 of different materials and different thicknesses on the contraband 3 placed on the lower layer of the case 1 is different.
The invention also provides a testing method realized by using the testing box, which is used for testing the detection capability of the contraband detection algorithm, and is essentially used for testing the automatic identification capability of the contraband detection algorithm to the contraband in the X-ray image. The test method using the test box set is essentially a method which uses the test box to image through an X-ray device with a contraband detection function and then records scores of the detection conditions of the contraband according to a contraband detection algorithm. The method specifically comprises the steps of generating an X-ray image combination by using a test box through an X-ray device running a contraband detection algorithm, detecting and identifying the X-ray image according to the contraband detection algorithm, and recording scores of detection conditions of the contraband.
At the time of the test, there are the following two test modes. The first method is to use an X-ray detection device running a contraband detection algorithm to detect a test box passing through a detection channel so as to acquire an X-ray image in real time, then the contraband detection algorithm performs image identification on the X-ray image to acquire the number of correctly identified contraband in different shielding scenes, and thus the detection capability of the contraband detection algorithm is tested. And secondly, directly using a contraband detection algorithm to perform image recognition on the X-ray image of the test box acquired in advance, and acquiring the number of correctly recognized contraband in different shielding scenes, so as to test the detection capability of the contraband detection algorithm. Because the detection of the contraband detection algorithm is independent of the acquisition process of the X-ray image, the X-ray image of the test box obtained in advance is directly used for detection in the detection process of the contraband detection algorithm, and the influence of the X-ray imaging process on the detection result of the contraband detection algorithm can be eliminated.
Specifically, the testing method for testing the contraband detection algorithm provided by the invention comprises the following steps:
(1) And acquiring X-ray images of one or more test boxes corresponding to the detection function to be tested by the contraband detection algorithm under different shielding scenes according to the detection function to be tested by the contraband detection algorithm.
When the X-ray image is acquired, the X-ray image of the test box corresponding to the function to be tested by the contraband detection algorithm is acquired pertinently according to different testing purposes, so that the contraband detection algorithm is detected pertinently. Specifically, one or more of a gun test box, a control tool test box, a lighter test box, a dangerous tool test box and a comprehensive posture test box are selected according to the function to be tested by the contraband detection algorithm, and then an X-ray image corresponding to the selected test box is obtained.
For example, when detecting a contraband detection algorithm with a gun recognition function, only a gun test box is needed to be used or an X-ray image of the gun test box is directly acquired for testing, and other test boxes are not selected. When detecting the contraband detection algorithm with the gun recognition function and the dangerous tool recognition function, the gun test box and the dangerous tool test box are used for acquiring X-ray images in real time, or the X-ray images of the gun test box and the dangerous tool test box which are acquired in advance are directly acquired for testing, and other test boxes are not selected.
The X-ray image of the test box acquired in this step may be an X-ray image of a test box stored in advance, or may be an X-ray image acquired in real time using a detection device running a contraband detection algorithm.
When the X-ray images of each test box are acquired, the X-ray images under different shielding scenes are respectively acquired. In order to acquire X-ray images of the test box in different occlusion scenes, the test box needs to pass through the detection channel of the X-ray detection device multiple times under the condition of using the occlusion body to conduct occlusion to different degrees. Defining a scene without a shielding body as a simple scene; defining a scene in which a maximum-size shielding body is placed as a general complex scene; a scene in which three layers of shutters are simultaneously placed is defined as a complex scene. The detection channel of the X-ray detection equipment is sequentially passed through the test box three times, so that X-ray images of the test box in a simple scene without using a shielding body, a general complex scene using a large-size shielding body and a complex scene using three layers of shielding bodies simultaneously are obtained, and the contraband detection algorithm is comprehensively tested. In actual test, the scene using the two layers of shielding bodies can be tested according to the requirement, so that a more comprehensive test result is obtained.
(2) And (3) detecting and identifying the X-ray image acquired in the step (1) by using a contraband detection algorithm to obtain the number of correctly identified contraband in each scene. The judgment standard for correctly identifying the contraband is that the intersection ratio of the prediction frame and the standard frame is more than 50% under the condition that the category identification is correct. The cross-over ratio of the predicted box to the standard box is schematically shown in fig. 13, where the larger box (black box) is the predicted box and the smaller box (gray box) is the standard box, and the cross-over ratio is the ratio of the area of the overlapping area (cross-hatched portion) of the two boxes divided by the area occupied by the two boxes (i.e., the total area of the two boxes after de-duplication).
(3) Comparing the number of the contraband correctly identified in the step (2) with a preset threshold, and when the number of the contraband correctly identified in all the shielding scenes is equal to or larger than the preset threshold, enabling the contraband detection algorithm to have a corresponding detection function, otherwise, judging that the contraband detection algorithm does not have the corresponding detection function.
The preset threshold values recommended by the different occlusion scenes in the step (3) are as follows: the threshold value of the simple scene is not less than 80% of the total amount of contraband in the test box, the threshold value of the complex scene is not less than 60% of the total amount of contraband in the test box, the threshold value of the complex scene is not less than 50% of the total amount of contraband in the test box, and the number of correctly identified contraband in all shielding scenes is not less than 65% of the total amount of contraband in the test box.
The method for recording scores provided in step (3) of the present invention is to score each of the 3X-ray images obtained from 3 scenes by 1 score each time a contraband is detected. The scores of all 3 scenarios are equal to the sum of the number of contraband, and the total score is equal to the sum of the number of contraband by a factor of 3. The total score for each test box is different due to the different number of contraband for each test box. For example, there are 9 simulated firearms in a firearm test box, so the total score for the test box is 27, where a simple scenario 9 points, typically a complex scenario 9 points, a complex scenario 9 points. The above test method may provide that the rules that pass the test are: the simple scene gets the score of 80% or more (7 points), the complex scene gets the score of 60% or more (5 points), the complex scene gets the score of 50% or more (4 points), the total score gets the score of 65% or more (17 points).
The test method for testing the contraband detection algorithm provided by the present invention will be described below by taking two examples as examples. The testing method provided by the invention can select one or more testing boxes provided by the invention for testing according to the type of contraband detection (particularly the detection function to be tested by a contraband detection algorithm running on the X-ray equipment) of the X-ray equipment to be tested.
The X-ray device to be tested in the first embodiment 1 has the function of detecting all contraband categories in 5 test boxes, for which the whole set of test boxes is selected for testing.
As shown in fig. 12, the 5 test boxes are respectively passed through the X-ray device to be tested 3 times to generate X-ray images, wherein the X-ray images are respectively obtained in a simple scene without any shielding body, the X-ray images are respectively obtained in a general complex scene with a shielding body with the maximum size of one material placed in 3 grooves in the shielding body liner, and the X-ray images are respectively obtained in a complex scene with a shielding body with the full size of one material placed in 3 grooves in the shielding body liner, wherein when three layers of shielding bodies are stacked, three shielding bodies are arranged from bottom to top, and the three shielding bodies are aligned to the hinge of the upper cover of the box body.
The 3 images have generated a prediction box and identified the detection result of the category. The score recording method provided by the invention is that each image in 3X-ray images correctly detects 1 score of contraband, the correct detection means that the intersection ratio of a prediction frame and a standard frame is larger than 50% under the condition that the category identification is correct, the intersection ratio of the prediction frame and the standard frame is shown schematically in fig. 13, wherein a gun at the upper right corner of the X-ray image of a gun test box is taken as an example, a larger box is the prediction frame, a smaller box is the standard frame, and the intersection ratio is the ratio of the area of the overlapping area of two boxes divided by the area occupied by the two boxes (namely the total area of the two boxes after weight removal). The score for each scenario is equal to 1x the number of contraband and the total score is equal to 3 x the number of contraband. The total score for each type of contraband detection function is different due to the different number of contraband per type. The rule of the invention provides that the simple scene gets more than or equal to 80% score, the complex scene gets more than or equal to 60% score, the complex scene gets more than or equal to 50% score, and the total score gets more than or equal to 65% score. Since a fractional fraction may occur by multiplying the total fraction by the pass percentage, a round down approach is used in this embodiment. The score for each test bin and the pass score are shown in Table 2. According to the situation of the picture frame, the actual score is statistically tested, and the last column of the table is filled, so that whether various detection functions of the contraband detection algorithm running on the X-ray detection equipment are qualified or not can be detected.
Table 2 various test box scores and pass criteria
In the second embodiment, the test method is described taking an example in which the X-ray apparatus to be tested has a lighter detecting function. In this case, the lighter test box is selected for testing, and the other test boxes are not selected.
In a second embodiment, as shown in fig. 14, the lighter test box is passed 3 times through the X-ray device under test to generate X-ray images. The obtained X-ray images are as shown in the lower half of fig. 14, and are respectively an X-ray image obtained in a simple scene without any shielding body, an X-ray image obtained in a general complex field with a shielding body with the largest size of one material respectively placed in 3 grooves of a shielding body liner in a lighter test box, and an X-ray image obtained in a complex scene with a shielding body with the whole size of one material respectively placed in 3 grooves of a shielding body liner in a lighter test box, wherein when three layers of shielding bodies are placed in each groove, the three shielding bodies are arranged from top to bottom from top, and the three shielding bodies are aligned to the hinge of the upper cover of the box body respectively.
Detection results for the prediction box identification class have been generated on these 3X-ray images. The score recording method is that each image in the 3X-ray images correctly detects 1 score of contraband, and the detection accuracy means that the intersection ratio of the prediction frame and the standard frame is more than 50% under the condition that the category identification is correct. The score for each scenario is equal to 1 x the number of contraband and the total score is equal to 3 x the number of contraband. In this embodiment, the statistical score manner and test passing criteria are the same as those of the first embodiment, see table 3 specifically, wherein 22 samples are set in the lighter test box, and when the score of the contraband detection algorithm in a simple scene is not less than 17 points, the score in a general complex scene is not less than 13 points, the score in the complex scene is not less than 11 points, and the score in the three scenes is not less than 42 points, it can be determined that the lighter test function of the contraband detection algorithm is acceptable. Specifically, according to the situation of the picture frame, the actual score is statistically tested, and the actual score is filled in the last column of the table shown in table 3, so that whether the contraband detection algorithm running on the X-ray detection equipment has a qualified lighter detection function can be detected.
Table 3 detection lighter algorithm score and pass criteria
In summary, the test box for testing the contraband detection algorithm fully considers the types and the placement postures of various contraband, abstracts complex and changeable mass contraband samples for testing into typical contraband, and simulates common shielding scenes when detecting the contraband by using shielding bodies of several typical materials to design a plurality of test boxes for accommodating different contraband. One or more of the test boxes can be used for acquiring X-ray images of the test boxes under different shielding scenes, and the X-ray images are used for detecting the contraband detection algorithm with the corresponding contraband detection function, so that the test quantity is reduced, the test flow is simplified, whether the contraband detection algorithm has certain detection capability can be quickly and preliminarily confirmed, the purpose of preliminary screening is achieved, the test of directly organizing a large sample is avoided, and manpower and material resources are saved. The testing method realized by using the testing box provides a quantized index detection basis for a contraband detection algorithm.
The test box and the test method for testing the contraband detection algorithm provided by the invention are described in detail. Any obvious modifications to the present invention, as would be apparent to those skilled in the art, would constitute an infringement of the patent rights of the invention and would take on corresponding legal liabilities without departing from the true spirit of the invention.
Claims (12)
1. A test method for testing a contraband detection algorithm, comprising the steps of:
(1) Acquiring X-ray images of one or more test boxes corresponding to the detection functions to be tested by the contraband detection algorithm under different shielding scenes according to the detection functions to be tested by the contraband detection algorithm; the test box comprises a box body, a contraband lining, contraband, a shielding body lining and a shielding body; the contraband pad is arranged at the lower layer in the box body, wherein a groove is milled according to the size of the contraband and the contraband is inlaid in the contraband pad to be fixed; the shielding body gasket is arranged above the contraband gasket, wherein a groove is milled according to the size of the shielding body, and the shielding body is inlaid in the shielding body gasket for fixation;
(2) Detecting and identifying the X-ray image acquired in the step (1) by using the contraband detection algorithm to acquire the number of correctly identified contraband in each shielding scene;
(3) Comparing the number of the contraband correctly identified in the step (2) with a preset threshold, wherein when the number of the contraband correctly identified in all the shielding scenes is equal to or greater than the preset threshold, the contraband detection algorithm has a corresponding detection function, otherwise, the contraband detection algorithm is judged not to have the corresponding detection function; the preset thresholds of different shielding scenes are as follows: the threshold value of the simple scene is not less than 80% of the total amount of contraband in the test box, the threshold value of the complex scene is not less than 60% of the total amount of contraband in the test box, the threshold value of the complex scene is not less than 50% of the total amount of contraband in the test box, and the number of correctly identified contraband in all shielding scenes is not less than 65% of the total amount of contraband in the test box.
2. The test method of claim 1, wherein:
In the step (1), one or more of a gun test box, a control tool test box, a lighter test box, a dangerous tool test box and a comprehensive posture test box are selected according to the detection function to be tested by the detection algorithm, and then an X-ray image corresponding to the selected test box is acquired.
3. The test method of claim 1, wherein:
in the step (1), the obtained X-ray image of the test box is a pre-stored X-ray image of the test box; or the acquired X-ray image of the test box is an X-ray image acquired in real time using a detection device running the contraband detection algorithm.
4. The test method of claim 1, wherein:
In the step (1), the obtained X-ray images of the test box include X-ray images of the test box acquired in a simple scene without using a shutter, a general complex scene using a large-sized shutter, and a complex scene using three layers of shutters simultaneously, respectively.
5. The test method of claim 1, wherein:
In the step (2), the intersection ratio of the prediction frame and the standard frame is greater than 50% when the correct identification of the contraband is judged by the correct identification of the category.
6. The test method of claim 1, wherein:
the shielding body comprises any one or more of an organic glass shielding body, an aluminum plate shielding body and a steel plate shielding body.
7. The test method of claim 1, wherein:
When the shielding body gasket is simultaneously provided with shielding bodies made of various materials, the thickness of the shielding bodies made of different materials is different.
8. The test method of claim 1, wherein:
Three grooves for placing the shielding bodies are formed in the shielding body gasket, three shielding bodies made of the same material are placed in each groove, and the thickness of each organic glass plate shielding body is 25-35 mm; the thickness of each aluminum plate shielding body is between 4mm and 6 mm; the thickness of the large-size steel plate shielding body is between 2.5 and 3.5mm, and the thickness of the medium-size and small-size steel plate shielding body is between 1.5 and 2.5 mm.
9. The test method of claim 1, wherein:
a plurality of said contraband placed in the same box corresponds to the same kind of contraband in the following categories: simulation gun and parts, control cutters, lighter contraband, dangerous tools or explosion contraband.
10. The test method of claim 1, wherein:
A plurality of said contraband placed in the same box corresponds to a plurality of kinds of contraband among the following kinds: simulation gun and parts, control cutters, lighter contraband, dangerous tools or explosion contraband.
11. The test method of claim 1, wherein:
Multiple contraband items placed in the same box include contraband items having multiple poses.
12. The test method of claim 11, wherein:
Abstracting contraband into a cuboid with long sides, short sides and high, and placing the cuboid on an orthogonal plane of a ray sector in different modes to form five different postures:
Posture one: the plane formed by long sides and short sides of the cuboid is arranged on the orthogonal plane of the ray fan;
Posture II: the short side of the cuboid contacts with the orthogonal plane of the ray fan, and the included angle between the plane formed by the long side and the short side of the cuboid and the orthogonal plane of the ray fan is 45 degrees;
posture III: the cuboid plane formed by the short side and the high side is arranged on the orthogonal plane of the ray fan;
posture IV: the cuboid plane formed by long sides and high sides is arranged on the orthogonal plane of the ray fan surface;
Posture five: the height of the cuboid contacts with the orthogonal plane of the ray fan, and the included angle between the plane formed by the height and the long side of the cuboid and the orthogonal plane of the ray fan is 45 degrees.
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