Baggage inspection device

Abstract

To provide a possessed object inspection device capable of improving a detection rate of a possessed object by reducing oversight of a small possessed object.SOLUTION: A possessed object inspection device has a passive system for inspecting a possessed object by receiving a blackbody radiation 2 radiated from an object so as to image the object. The blackbody radiation is reflected against a polygon mirror 3 including a plurality of reflectors 4, 5 different in size. The reflected blackbody radiation is collected by a single condensing mirror 6 so as to be made incident to a detector 9. Detected images different in image size are synthetically processed so as to inspect the possessed object. Synthetic imaging processing where the images different in image size (resolution) are combined is performed and the images are fitted in image size, so as to reduce oversight of a small possessed object and also to improve a detection rate of dangerous materials such as a cutting tool, a firearm, and an explosive substance.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to a passive type possession inspection device that receives and images blackbody radiation (thermal noise) emitted from an object and inspects possessions. 【Background Art】 【0002】 Techniques for receiving and imaging blackbody radiation emitted from an object are used in astronomical observations and the like. Also, products that apply blackbody radiation images to body scanners for security are known. For example, Patent Document 1 describes a passive type millimeter wave imaging device and an imaging image display device that capture an image of a subject by receiving thermal noise in the millimeter wave band emitted from the subject, which is the object. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2012-21954 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 By the way, a passive type device as described in Patent Document 1 has a trade-off problem between reception intensity and pixel size (resolution). That is, the intensity of the received blackbody radiation is proportional to the sizes of the polygon mirror and the condenser mirror, but the pixel size is also proportional to the size of the mirror. Therefore, there is a trade-off relationship between reception intensity and resolution. Moreover, when scanning with a polygon mirror, the pixel size changes depending on the angle in the vertical direction, so the reception intensity and resolution are different and the captured image becomes non-uniform. 【0005】 For this reason, in possession inspection, there are problems such as overlooking small possessions and a decrease in the detection rate of possessions. 【0006】 This invention has been made in view of the above circumstances, and its purpose is to provide a personal belongings inspection device that can reduce the oversight of small personal belongings and improve the detection rate of personal belongings. [Means for solving the problem] 【0007】 A personal belongings inspection device according to one aspect of the present invention is a passive personal belongings inspection device that receives and images blackbody radiation emitted from an object to inspect the belongings, characterized in that the blackbody radiation is reflected by a polygon mirror equipped with multiple reflectors of different sizes, the reflected blackbody radiation is focused by a single focusing mirror and incident on a detector, and the detected images of different pixel sizes are synthesized to inspect the belongings. [Effects of the Invention] 【0008】 In the present invention's personal belongings inspection device, multiple mirrors of different sizes are provided on a polygon mirror to reflect blackbody radiation, which is then focused by a single focusing mirror and detected by a detector to synthesize images with different pixel sizes. This synthesis process equalizes the pixel sizes of the images reflected by the mirrors of different sizes, thereby suppressing image distortion, reducing the chance of overlooking small belongings, and improving the detection rate of personal belongings. [Brief explanation of the drawing] 【0009】 [Figure 1] This is a schematic diagram of a personal belongings inspection device according to an embodiment of the present invention. [Figure 2] Figure 1 is a perspective view showing the components of the personal belongings inspection device, which guide the blackbody radiation emitted from an object to the antenna using reflectors of different polygonal mirror sizes. [Figure 3] Figure 1 is a schematic diagram showing the configuration of a walk-through type personal belongings inspection device. [Figure 4] This is a plan view of Figure 3, seen from above. [Figure 5] Figures 3 and 4 illustrate an example of the configuration of a sensor unit in the personal belongings inspection device. [Figure 6] Figures 3 and 4 show the relationship between the image and resolution when a person enters the body using the personal belongings inspection device. [Figure 7] Figures 3 to 5 are flowcharts illustrating the operation of the walk-through type personal belongings inspection device. [Figure 8] This is a flowchart to explain the operation that follows Figure 7. [Figure 9] This figure illustrates the pixel arrangement of the image generated by the first reflecting mirror. [Figure 10] This diagram illustrates the pixel arrangement of the image generated by the second reflecting mirror. [Figure 11] This diagram illustrates the pixel arrangement of an image created by combining the image from the first reflector and the image from the second reflector. [Figure 12] Figures 3 to 5 show the detected images and composite images in a walk-through type personal belongings inspection device. [Figure 13] A perspective view showing another example of the configuration of the polygon mirror in the personal belongings inspection device according to an embodiment of the present invention. [Figure 14] This is a perspective view showing yet another configuration example of a polygon mirror in a personal belongings inspection device according to an embodiment of the present invention. [Modes for carrying out the invention] 【0010】 Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows a schematic configuration of a personal belongings inspection device according to an embodiment of the present invention. Figure 2 shows a component in the personal belongings inspection device shown in Figure 1 that guides blackbody radiation emitted from an object to an antenna using reflectors of different polygonal mirror sizes. Figure (a) shows the case where blackbody radiation is reflected by a larger first reflector, and Figure (b) shows the case where blackbody radiation is reflected by a smaller second reflector. 【0011】 As shown in Fig. 1, the personal belongings inspection device scans (scans) the blackbody radiation 2 emitted from the human body 1 serving as the subject by means of a polygon mirror 3 rotating at high speed and detects it. As shown in Figs. 2(a) and 2(b) for example, on the surface of a disk 3a rotating at high speed along the central axis AX1 of the polygon mirror 3, a first reflector 4 with a large size and a second reflector 5 with a small size are attached. The first reflector 4 is formed by vapor deposition or the like on the upper surface of a columnar pedestal 4a erected on the surface of the disk 3a. As shown in Fig. 2(a), this first reflector 4 is inclined at a predetermined angle with respect to the surface of the disk 3a and reflects the blackbody radiation 2 toward the condenser mirror 6. 【0012】 Similarly, the second reflector 5 is formed by vapor deposition or the like on the upper surface of a columnar pedestal 5a erected on the surface of the disk 3a. As shown in Fig. 2(b), this second reflector 5 is also inclined at a predetermined angle with respect to the surface of the disk 3a and reflects the blackbody radiation 2 toward the condenser mirror 6. The sizes of the first reflector 4 and the second reflector 5 are preferably such that the pixel size difference is about twice. For example, the dimensional ratio of the first reflector 4 and the second reflector 5 is 2 times (the area ratio is 4 times). Also, the rotation speed of the polygon mirror 3 is preferably determined according to the pixel density of the first reflector 4 and the second reflector 5. 【0013】 The blackbody radiation 2 reflected by the polygon mirror 3 is guided to and received by an antenna (horn antenna) 7 by the condenser mirror 6. Since the resolution is determined by the amount of energy of the blackbody radiation 2 guided to the condenser mirror 6, the reception intensity of the blackbody radiation 2 reflected by the first reflector 4 is higher (stronger) than that of the blackbody radiation 2 reflected by the second reflector 5. In contrast, the resolution of the blackbody radiation 2 reflected by the first reflector 4 is lower (weaker) than that of the blackbody radiation 2 reflected by the second reflector 5. 【0014】 The blackbody radiation 2 received by the antenna 7 is amplified by the amplifier 8 and then input to the detector 9 for detection. The detection result by this detector 9 is input to the processing unit 10, and images with different pixel sizes are subjected to synthesis processing. By this synthesis processing, the pixel sizes of the images reflected by the reflectors 4 and 5 with different sizes are made uniform. Specifically, distortion of the image is suppressed by combining and synthesizing a region with a small pixel size of the image formed by reflecting the blackbody radiation 2 with the first reflector 4 and a region with a large pixel size of the image formed by reflecting the blackbody radiation 2 with the second reflector 5. When the processing unit 10 detects dangerous objects such as knives, firearms, and explosives based on this synthesis processing result, the processing result is notified to the upper device. 【0015】 Alternatively, the synthesized image is displayed on the display device 11, and when an inspector detects dangerous objects such as knives, firearms, and explosives from the processing result and the displayed image, an alarm device 12 or the like is activated to notify the surroundings. 【0016】 Note that the sampling rate of the image in the processing unit 10 is preferably adjusted according to the specifications of image synthesis by combining each pixel. Further, the imaging process can improve the resolution by performing it for each of the first and second reflectors 4 and 5 in a time-sharing manner. In addition, the detection accuracy can be improved by also using the synthesized image obtained by combining the pixels acquired by each reflector 4 and 5 for determination. 【0017】 FIG. 3 shows a configuration example when the possession inspection device in FIG. 1 is configured as a walk-through type. Further, FIG. 4 is a plan view of FIG. 3 seen from above. Sensor units 21-1 to 21-4 are arranged on the left and right in front and the left and right in the rear of the passage 20 indicated by the arrow in FIGS. 3 and 4, respectively, to detect the blackbody radiation 2 from the human body 1 walking in the direction of the arrow in the passage 20, and inspect the possession based on the detected blackbody radiation 2. These sensor units 21-1 to 21-4 are each composed of upper units 21-1a to 21-4a and lower units 21-1b to 21-4b. 【0018】 Sensor unit 21-1, positioned to the left front of human body 1, detects the left half of the front of human body 1 when human body 1 is positioned between sensor units 21-1 to 21-4, while sensor unit 21-2, positioned to the right front of human body 1, detects the right half of the front of human body 1. On the other hand, sensor unit 21-3, positioned to the left rear of human body 1, detects the left half of the back of human body 1 when human body 1 is positioned between sensor units 21-1 to 21-4, while sensor unit 21-4, positioned to the right rear of human body 1, detects the left half of the back of human body 1. Then, the blackbody radiation 2 detected by the aforementioned sensor units 21-1 to 21-4 is processed into a composite image, and the belongings are inspected. 【0019】 Figure 5 is a diagram illustrating an example of the configuration of a sensor unit in the personal belongings inspection device shown in Figures 3 and 4. Here, the configuration of sensor unit 21-1 is shown as a representative example, but sensor units 21-2 to 21-4 are configured similarly. Sensor unit 21-1 consists of an upper sensor 21-1a that detects the upper left half of the front of the human body 1, and a lower sensor 21-1b that detects the lower left half of the front of the human body 1. 【0020】 The upper sensor 21-1a comprises a polygon mirror 3a, a focusing mirror 6a, an antenna 7a, an amplifier 8a, and a detector 9a. The polygon mirror 3a reflects blackbody radiation 2a emitted from the upper left half of the front of the human body 1 and directs it to the focusing mirror 6a. By rotating the polygon mirror 3a, the upper left half of the front of the human body 1 is scanned vertically (up and down). The blackbody radiation 2a reflected by the focusing mirror 6a is received by the antenna 7a, amplified by the amplifier 8a, and then detected by the detector 9a. 【0021】 The lower sensor 21-1b also includes a polygon mirror 3b, a focusing mirror 6b, an antenna 7b, an amplifier 8b, and a detector 9b. The polygon mirror 3b reflects blackbody radiation 2b emitted from the lower left half of the front of the human body 1 and directs it to the focusing mirror 6b. By rotating the polygon mirror 3b, the lower left half of the front of the human body 1 is scanned vertically (up and down). The blackbody radiation 2b reflected by the focusing mirror 6b is received by the antenna 7b, amplified by the amplifier 8b, and then detected by the detector 9b. 【0022】 The detection outputs from detectors 9a and 9b are then input to the processing unit 10 for processing. The detection results are displayed on the display device 11 as needed, and the alarm device 12 alerts the surrounding area when dangerous objects such as knives, firearms, or explosives are detected. Furthermore, by inputting the detection outputs of the detectors from sensor units 21-2 to 21-4 into the processing unit 10 for processing, it is possible to inspect the belongings of the human body 1 from the front, back, left, and right. 【0023】 Figure 6 shows the relationship between the image and resolution when the entry of a person 1 is detected by the personal belongings inspection device in Figures 3 and 4, and is an image of a vertical line scan performed by two units, upper and lower. Sensor unit 21-1 (upper sensor 21-1a and lower sensor 21-1b) captures an image of the left front half of the person 1, and sensor unit 21-2 (upper sensor 21-2a and lower sensor 21-2b) captures an image of the right front half of the person 1. Although not shown, the same process is followed for the back side, with sensor unit 21-3 (upper sensor 21-3a and lower sensor 21-3b) capturing an image of the left hind half, and sensor unit 21-4 (upper sensor 21-4a and lower sensor 21-4b) capturing an image of the right hind half. 【0024】 In Figure 6(a), the scan ranges of sensor units 21-1 and 21-2 are shown by dashed lines, and objects in the upper and lower parts of these scan ranges are detected by the upper units 21-1a and 21-2a and the lower units 21-1b and 21-2b. 【0025】 Figure 6(b) shows the resolution of the scan range of the image in Figure 6(a) represented by circles 22 with different diameters in the vertical direction (shown by dashed lines). Smaller circles indicate higher resolution, and larger circles indicate lower resolution. When the human body 1 is facing forward, blackbody radiation 2 is incident on the polygon mirror 3 at a 45° angle, causing the size of the circle 22 to decrease (higher resolution), and as the angle becomes steeper, the size of the circle 22 increases (lower resolution). In addition, distortion occurs in the circle 22 at both the top and bottom ends, causing it to deform and stretch in the vertical direction. Therefore, each sensor unit 21-1a, 21-2a, 21-1b, 21-2b has high resolution in the central part and low resolution at both ends. 【0026】 Figures 7 and 8 are flowcharts illustrating the operation of the walk-through type personal belongings inspection device shown in Figures 3 to 5. For the sake of simplicity, the polygon mirror, focusing mirror, antenna, amplifier, and detector are treated as a single unit here, but in reality, these components and equipment are provided in the upper sensors 21-1a to 21-4a and the lower sensors 21-1b to 21-4b of each of the sensor units 21-1 to 21-4. 【0027】 When a person passes between sensor units 21-3 and 21-4, the entry of the person 1 is detected (step S1), and the polygon mirror 3 is driven to rotate (step S2). In steps S3 to S8, the mirror angle of the polygon mirror 3 is sequentially set from the upper limit to the lower limit, and the detection level of the blackbody radiation 2 reflected by the first reflector 4 of the polygon mirror 3 (detection level of the large polygon mirror) and the detection level of the blackbody radiation 2 reflected by the second reflector 5 (detection level of the small polygon mirror) are acquired, respectively. 【0028】 Specifically, in step S3, the mirror angle of the polygon mirror 3 is set to the upper limit, the blackbody radiation 2 reflected by the first reflector 4 is collected by the focusing mirror 6, received by the antenna 7, detected by the detector 9, and processed and acquired by the processing unit 10. Similarly, the blackbody radiation 2 reflected by the second reflector 5 is detected by the detector 9 and acquired by the processing unit 10. In step S4, the mirror angle of the polygon mirror 3 is set to "upper limit - 1", the blackbody radiation 2 reflected by the first reflector 4 is detected by the detector 9 and acquired by the processing unit 10, and the blackbody radiation 2 reflected by the second reflector 5 is also detected by the detector 9 and acquired by the processing unit 10. In step S5, the mirror angle of the polygon mirror 3 is set to "upper limit - 2", the blackbody radiation 2 reflected by the first reflector 4 is detected by the detector 9 and acquired by the processing unit 10, and the blackbody radiation 2 reflected by the second reflector 5 is also detected by the detector 9 and acquired by the processing unit 10. 【0029】 Similarly, the mirror angle of the polygon mirror 3 is gradually decreased from the upper limit, and the blackbody radiation 2 reflected by the first reflector 4 is detected by the detector 9 and acquired by the processing unit 10, and the blackbody radiation 2 reflected by the second reflector 5 is detected by the detector 9 and acquired by the processing unit 10 (step S6). In step S7, the mirror angle of the polygon mirror 3 is set to "lower limit - 1", and the blackbody radiation 2 reflected by the first reflector 4 is detected by the detector 9 and acquired by the processing unit 10, and the blackbody radiation 2 reflected by the second reflector 5 is detected by the detector 9 and acquired by the processing unit 10. Furthermore, in step S8, the mirror angle of the polygon mirror 3 is set to "lower limit", and the blackbody radiation 2 reflected by the first reflector 4 is detected by the detector 9 and acquired by the processing unit 10, and the blackbody radiation 2 reflected by the second reflector 5 is detected by the detector 9 and acquired by the processing unit 10. 【0030】 In the next step S9, the detection results from the upper limit to the lower limit are saved in the current time column of the image array from the first reflector 4. The image array from the first reflector 4 saved in step S9 is shown in Figure 9. The processing unit 10 stores "current time t", "t-1" a predetermined time before, "t-2" a predetermined time before that, and so on. The detection results acquired thereafter are stored in "t+1", "t+2", and so on, a predetermined time after that, relative to "current time t". 【0031】 At the "current time," images are stored from the "upper limit" position captured by the large first reflector 4 down to the positions "upper limit-1," "upper limit-2," "upper limit-3," "upper limit-4," ..., "lower limit-4," "lower limit-3," "lower limit-2," "lower limit-1," and "lower limit." Also, at time "t-1," images are stored from the "upper limit" position captured by the first reflector 4 down to the positions "upper limit-1," "upper limit-2," "upper limit-3," "upper limit-4," ..., "lower limit-4," "lower limit-3," "lower limit-2," "lower limit-1," and "lower limit." Furthermore, at time "t-2," images are stored from the "upper limit" position captured by the first reflector 4 down to the positions "upper limit-1," "upper limit-2," "upper limit-3," "upper limit-4," ..., "lower limit-4," "lower limit-3," "lower limit-2," "lower limit-1," and "lower limit." 【0032】 In step S10, the detection levels from the upper limit to the lower limit are similarly saved in the current time sequence of the image array from the second reflector 5. The image array from the second reflector 5 saved in step S10 is shown in Figure 10. The processing unit 10 saves "t-1", "t-2", etc., which are predetermined time prior to "current time t", and "t+1", "t+2", etc., which are predetermined time prior to "current time t", and the detection results acquired thereafter are saved in "t+1", "t+2", etc., which are predetermined time prior to "current time t". 【0033】 At the "current time," images from the "upper limit" position captured by the smaller second reflector 5 are stored, down to the positions "upper limit-1," "upper limit-2," "upper limit-3," "upper limit-4," ..., "lower limit-4," "lower limit-3," "lower limit-2," "lower limit-1," and "lower limit." Also, at time "t-1," images from the "upper limit" position captured by the second reflector 5 are stored, down to the positions "upper limit-1," "upper limit-2," "upper limit-3," "upper limit-4," ..., "lower limit-4," "lower limit-3," "lower limit-2," "lower limit-1," and "lower limit." Furthermore, at time "t-2," images from the "upper limit" position captured by the second reflector 5 are stored, down to the positions "upper limit-1," "upper limit-2," "upper limit-3," "upper limit-4," ..., "lower limit-4," "lower limit-3," "lower limit-2," "lower limit-1," and "lower limit." 【0034】 Subsequently, the detection levels of the second reflector 5 are stored in the upper and lower parts of the image sequence, and the detection level of the first reflector 4 is stored in the central part (step S11). The image sequence of the second reflector 5 stored in step S11 is shown in Figure 11. The processing unit 10 stores "current time t", "t-1" a predetermined time before, "t-2" a predetermined time before that, and so on, and the detection results acquired thereafter are stored at "t+1", "t+2", and so on, a predetermined time after that, relative to "current time t". 【0035】 At the "Current Time," images from the "Upper Limit" position, taken by the second reflector 5, down to the "Upper Limit-1," "Upper Limit-2," "Upper Limit-3," and so on, are stored. Images taken by the first reflector 4 are stored at the "Center+2," "Center+1," "Center," "Center-1," and "Center-2" positions. Images taken by the second reflector 5 are stored at the "Lower Limit-3," "Lower Limit-2," "Lower Limit-1," and "Lower Limit" positions. 【0036】 Furthermore, images from the second reflector 5 are stored at the positions "upper limit-1", "upper limit-2", "upper limit-3", etc., at time "t-1", images from the first reflector 4 are stored at the positions "center+2", "center+1", "center", "center-1", "center-2", and images from the second reflector 5 are stored at the positions "lower limit-3", "lower limit-2", "lower limit-1", and "lower limit". 【0037】 Furthermore, images from the second reflector 5 are stored at the positions "upper limit-1", "upper limit-2", "upper limit-3", ... at time "t-2", images from the first reflector 4 are stored at the positions "center+2", "center+1", "center", "center-1", and "center-2", and images from the second reflector 5 are stored at the positions "lower limit-3", "lower limit-2", "lower limit-1", and "lower limit". 【0038】 Next, it is determined whether or not a person has passed between sensor units 21-1 and 21-2 (step S12). If the advance of a human body 1 is detected, image processing (edge ​​detection), determination processing (presence or absence of possessions), notification of the result to the higher-level device, and stopping of the polygon mirror are performed (step S13). 【0039】 The image processing described above can, for example, use image intensity differences to perform edge extraction and then use a rule-based process to detect the presence or absence of object contours (edges) within the human body contours (edges). Alternatively, the image can be processed using AI (deep learning, machine learning) to identify the presence or absence of objects and their type (e.g., a knife) based on their characteristics. Furthermore, a combination of these methods may also be used. On the other hand, if the advance of human body 1 is not detected in step S12, the process returns to step S3 and repeats the actions up to step S12. 【0040】 Figure 12 shows images of the detection output in the personal belongings inspection device shown in Figures 3 and 4. Figure 12(a) is an image of pixels reflected by the first reflector 4 and focused by the focusing mirror 6, and Figure 12(b) is an image of pixels reflected by the second reflector 5 and focused by the focusing mirror 6. Figure 12(c) shows a composite image of Figures 12(a) and (b). By combining the image of the central part by the first reflector 4 and the pixels of the upper and lower parts by the second reflector 5, an image is obtained that combines image 23b from the pixels of the second reflector 5, image 23a from the pixels of the first reflector 4, and image 23c from the pixels of the second reflector 5, as shown in Figure 12(c). As a result, an image with relatively similar pixel sizes (resolutions) is obtained. 【0041】 In this way, by combining the image from the first reflector 4, which has low resolution but strong blackbody radiation 2 reception intensity, with the image from the second reflector 5, which has weak reception intensity but high resolution, it is possible to simultaneously capture a low-resolution image with strong blackbody radiation 2 intensity and a high-resolution image with weak intensity. By combining these images, it is possible to synthesize an image with a relatively uniform pixel size. This results in an image with uniform blackbody radiation 2 intensity, leading to improved resolution. 【0042】 Therefore, according to the present invention, by combining images with different pixel sizes and standardizing the pixel sizes, image distortion can be suppressed, reducing the likelihood of overlooking small objects, and improving the detection rate of dangerous objects such as knives, firearms, and explosives. Moreover, the number of parts can be reduced compared to providing a polygon mirror for each pixel size, thus lowering costs. 【0043】 Figure 13 is a perspective view showing another configuration example of the polygon mirror in the possession inspection device of the present invention. This polygon mirror 30 has a truncated hexagonal shape, and multiple reflectors of different sizes are installed on the trapezoidal side. In this example, two types of reflectors, 31-1 to 31-3 and 32-1 to 32-3, are arranged alternately so that adjacent mirrors are of different sizes. The pixel size difference between these reflectors 31-1 to 31-3 and 32-1 to 32-3 is approximately 2, for example, the dimensional ratio of each reflector 31-1 to 31-3 and each reflector 32-1 to 32-3 is 2 (area ratio is 4). 【0044】 This polygon mirror 30 rotates along the central axis AX2, so that the blackbody radiation is focused by a focusing mirror (not shown). By using such a polygon mirror 30 in place of the polygon mirror 3 in Figure 2, the same effects and advantages as those of the embodiment described above can be obtained. In Figure 13, the example of a frustum-shaped polygon mirror was used, but it could also be a frustum-shaped square, a frustum-shaped octagon, or even larger. It is also possible to arrange two mirrors of different sizes alternately, such as two or four of each size, so that adjacent mirrors are of different sizes. 【0045】 Figure 14 is a perspective view showing yet another configuration example of the polygon mirror in the possession inspection device of the present invention. Similar to the polygon mirror shown in Figure 2, this polygon mirror 40 has four large reflectors 41-1 to 41-4 and four small reflectors 42-1 to 42-4 on the surface of a disk 40a that rotates at high speed along a central axis AX3. The pixel size difference between these reflectors 41-1 to 41-4 and the reflectors 42-1 to 42-4 is approximately double; for example, the dimensional ratio of each reflector 41-1 to 41-4 and each reflector 42-1 to 42-4 is double (the area ratio is quadruple). 【0046】 This polygonal mirror also rotates along its central axis AX3, so that it can focus blackbody radiation using a focusing mirror that is not shown in the diagram. By using such a polygon mirror 40 in place of the polygon mirror in Figure 2, the same effects and advantages as those of the embodiment described above can be obtained. In Figure 14, the polygon mirror 40 is equipped with four large reflectors 41-1 to 41-4 and four small reflectors 42-1 to 42-4, but it goes without saying that it is also possible to use three of each, or five or more of each. 【0047】 The configurations and operating procedures described in the above embodiments are merely schematic representations to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiments and can be modified in various forms as long as it does not deviate from the scope of the technical idea set forth in the claims. 【0048】 For example, the parts to be composited can be changed depending on the position and height of the person being photographed. In other words, by increasing the resolution or signal strength of the parts that are likely to be concealing dangerous objects, the detection rate of dangerous objects can be increased. Furthermore, while the explanation used the example of a case where the pixel size difference between the first and second reflectors is approximately double, it is not limited to a difference of double. Furthermore, although we have provided two types of reflecting mirrors of different sizes, it would also be acceptable to provide three or more types of reflecting mirrors of different sizes to receive blackbody radiation, create images, and combine them. [Explanation of Symbols] 【0049】 1…Human body, 2,2a,2b…Blackbody radiation, 3,3a,3b,30,40…Polygon mirror, 3a,40a…Disk, 4,31-1~31-3,41-1~41-4…First reflector, 5,32-1~32-3,42-1~42-4…Second reflector, 4a,5a…Base, 6,6a,6b…Focusing mirror, 7,7a,7b…Antenna, 8,8a,8b…Amplifier, 9,9a,9b…Detector, 10…Processing unit, 11…Display device, 12…Alarm device, 20…Passageway, 21-1~21-4…Sensor unit, 21-1a~21-4a…Upper unit, 21-1b~21-4b…Lower unit, 22…Circle (resolution), 23a,23b,23c…Image, AX1~AX3…Central axis

Claims

[Claim 1] A passive type of personal belongings inspection device that receives and images blackbody radiation emitted from an object to inspect the belongings, A personal belongings inspection device characterized by reflecting the blackbody radiation with a polygon mirror equipped with multiple mirrors of different sizes, focusing the reflected blackbody radiation with a single focusing mirror and directing it into a detector, and processing the detected images of different pixel sizes to inspect the belongings. [Claim 2] The personal belongings inspection device according to claim 1, characterized in that each of the multiple reflecting mirrors of different sizes is installed on the surface of a disk that rotates on a central axis and is set to a predetermined inclination angle that reflects the blackbody radiation and guides it to the focusing mirror. [Claim 3] The personal belongings inspection device according to claim 1 or 2, characterized in that the image synthesis process of images with different pixel sizes detected by the detector involves extracting and synthesizing a region with a small pixel size generated by a large reflecting mirror and a region with a large pixel size generated by a small reflecting mirror. [Claim 4] The personal belongings inspection device according to claim 1, characterized in that when a dangerous item is detected during the inspection of the personal belongings, the device notifies a higher-level device of the processing result, displays the processing result on a display device, or notifies the surroundings of the processing result.

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