Head scanner

Abstract

A head scanner includes: a base; the supporting rod is vertically arranged on the base; the dome device is arranged above the base, the dome device comprises a shell and a plurality of photographing modules arranged on the shell at intervals, the plurality of photographing modules are arranged to perform multi-angle photographing on the head to be measured, and images photographed by the plurality of photographing modules are used for generating a three-dimensional model of the head to be measured; and the lifting mechanism is fixedly connected with the dome device, is in sliding connection with the supporting rods and is arranged to adjust the height of the dome device. According to the head scanner, more accurate scanning data can be provided, and a three-dimensional head form which is visually displayed can be generated and displayed in a screen, so that convenience can be brought to diagnosis of doctors and explanation of parents, and the problems of poor accuracy, long time and non-visualization of head form judgment and measurement in clinical medicine at present are solved.

Description

Technical Field

[0001] This article relates to but is not limited to the field of medical devices related to infant head scanning and diagnosis, and in particular to a head scanner. Background Art

[0002] According to medical reports, about 70% of newborns have abnormal skull morphology, of which 35% have moderate or severe skull morphology abnormalities. Skull morphology abnormalities are divided into pathological and non-pathological. Non-pathological head shape abnormalities can be treated by adjusting sleeping posture and wearing orthopedic helmets. Pathological head shape abnormalities require surgery plus orthopedic helmets for treatment. Moderate to severe head shape abnormalities can affect children's craniofacial, motor nerves, optic nerves and even intellectual development. Therefore, it is very necessary to measure the head shape of infants and young children in the pediatrics department and screen for head shape abnormalities. At present, the main tool for judging head shape abnormalities in clinical medicine is the angle gauge. There are errors in each measurement data, data storage needs to be filled in manually, and the head shape is not visualized, which brings inconvenience to the doctor's diagnosis and explanation to parents.

[0003] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0004] The embodiment of the present application provides a head scanner that can provide more accurate scanning data and can generate an intuitive three-dimensional head shape for display on the screen, thereby facilitating the doctor's diagnosis and the explanation to the parents, and solving the current problems of poor measurement accuracy, long time and lack of visualization in clinical medicine for head shape judgment.

[0005] An embodiment of the present application provides a head scanner, comprising: a base; a support rod, erected on the base; a dome device, arranged above the base, the dome device comprising a shell and a plurality of camera modules spaced apart from the shell, the plurality of camera modules being arranged to take multi-angle photos of a head to be measured, the images taken by the plurality of camera modules being used to generate a three-dimensional model of the head to be measured; and a lifting mechanism, fixedly connected to the dome device and slidably connected to the support rod, and arranged to adjust the height of the dome device.

[0006] Compared with the related art, the head scanner provided in the embodiment of the present application can be used to screen for abnormal head shape in infants aged 3-18 months. During the examination, the infant is placed on the seat, and the height of the dome device is adjusted by the lifting mechanism so that the infant's head is located in the middle of the detection space in the dome device, ensuring that multiple camera modules can capture the infant's head from different angles. The images captured by multiple camera modules can be used to generate a three-dimensional model of the head, which is then displayed on a display device (such as a display screen) for doctors and parents to view.

[0007] Since multiple camera modules can take pictures of the head to be tested from different angles, by reasonably setting the number and position of the camera modules, accurate scanning data can be provided to generate an accurate three-dimensional head model, which is convenient for doctors to make accurate diagnoses and explain to parents by comparing the three-dimensional model, thus solving the current problems of poor measurement accuracy, long time and lack of visualization in clinical medicine for head shape judgment.

[0008] In addition, compared with traditional industrial-grade handheld laser scanners, the head scanner provided in the embodiment of the present application is completely shot with a camera lens, which produces less radiation and can reduce the concerns of parents of sick children. On the other hand, the algorithm of the industrial-grade handheld laser scanner is mainly aimed at static objects. Infants and young children facing the laser scanner are prone to shaking and crying quickly, which makes it difficult to splice the laser scanner scanning model and requires repeated scanning. The whole process takes 5-30 minutes; while the scanner provided in the embodiment of the present application uses multiple shooting modules to shoot at the same time. Infants and young children only need to sit in a comfortably designed seat, without stimulating light, and the measurement can be completed within 1 second, which can greatly improve the efficiency of measurement and diagnosis.

[0009] In addition, the setting of the lifting mechanism makes it easy to reasonably adjust the height of the dome device according to the different heights of infants and young children, which is beneficial to improving the accuracy of head shape detection for infants and young children of different heights. There is no need to adjust the position of the infant and young children, which can reduce stimulation to the infant and young children, and thus is beneficial to improving measurement and diagnosis efficiency.

[0010] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0012] Figure 1 A schematic diagram of a three-dimensional structure of a head scanner (without the outer cover) provided in some embodiments of the present application from a first viewing angle;

[0013] Figure 2 for Figure 1 A schematic diagram of the stereoscopic structure of the head scanner at a second viewing angle is shown;

[0014] Figure 3 for Figure 1 A schematic diagram of the right view of the head scanner shown;

[0015] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the middle dome device (without the outer cover) from one perspective;

[0016] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure of the dome device from another perspective;

[0017] Figure 6 for Figure 4 A schematic diagram of the structure of the dome device from a top view;

[0018] Figure 7 A schematic diagram of a three-dimensional structure of an outer cover provided in some embodiments of the present application;

[0019] Figure 8 A schematic diagram of a partially enlarged structure of an outer cover provided in some embodiments of the present application;

[0020] Fig. 9 A schematic diagram of partial assembly of a support rod and a lifting device provided in some embodiments of the present application;

[0021] Fig.10 for Fig. 9 A schematic diagram of the three-dimensional structure of the structure shown in another perspective;

[0022] Fig.11 A schematic diagram of a three-dimensional structure of a seat from one perspective provided in some embodiments of the present application;

[0023] Fig.12 for Fig.11 A three-dimensional structural diagram of the seat shown in another perspective;

[0024] Fig.13 for Fig.11 A schematic diagram of the three-dimensional structure of the seat shown from another perspective.

[0025] The reference numerals are as follows:

[0026] 1 base, 11 rollers, 12 feet;

[0027] 2 support rods, 21 control panel;

[0028] 3 dome device, 311 inner shell, 3111 shooting port, 3112 flange, 3113 receiving groove, 3114 card plate, 3115 positioning column, 3116 connecting plate, 3117 lower vent, 3118 U-shaped structure, 3119 step groove, 312 outer cover, 3121 upper vent, 3122 avoidance gap, 3123 avoidance hole, 3124 card slot, 32 camera module, 33 ventilation component, 34 detection space;

[0029] 4 seat, 41 guard bar, 42 raised part, 43 column, 44 slot;

[0030] 51 arc-shaped connecting piece, 511 connecting boss, 512 positioning groove, 52 sliding table. DETAILED DESCRIPTION

[0031] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0032] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features, and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique technical solution defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other technical solutions to form another unique technical solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0033] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0034] like Figures 1 to 3 As shown, an embodiment of the present application provides a head scanner, including: a base 1, a support rod 2, a dome device 3, a seat 4 and a lifting mechanism.

[0035] Among them, the support rod 2 is erected on the base 1. Figures 1 to 3 shown.

[0036] The dome device 3 is arranged above the base 1. Figures 4 to 6 As shown, the dome device 3 includes a housing and a plurality of camera modules 32 arranged at intervals in the housing. The housing encloses a detection space 34 for accommodating the head to be measured. The plurality of camera modules 32 are configured to take photos of the head to be measured at multiple angles. The images taken by the plurality of camera modules 32 are used to generate a three-dimensional model of the head to be measured.

[0037] like Figures 1 to 3 As shown, the seat 4 is located below the dome device 3 and is used to carry an infant whose head shape is to be measured.

[0038] The lifting mechanism is fixedly connected to the dome device 3 and slidably connected to the support rod 2, and is configured to adjust the height of the dome device 3. The specific structure of the lifting mechanism will be described in detail later.

[0039] The head scanner provided in the embodiment of the present application can be used to screen for abnormal head shape in infants aged 3-18 months. During the examination, the infant is placed on the seat 4, and the height of the dome device 3 is adjusted by the lifting mechanism so that the infant's head is located in the middle of the detection space 34 in the dome device 3, ensuring that the multiple camera modules 32 can capture the infant's head from different angles. The images captured by the multiple camera modules 32 can be used to generate a three-dimensional model of the head, which is then displayed on a display device (such as a display screen) for doctors and parents to view.

[0040] Since multiple camera modules 32 can take pictures of the head to be measured from different angles, by reasonably setting the number and position of the camera modules 32, accurate scanning data can be provided to generate an accurate three-dimensional head model, which is convenient for doctors to make accurate diagnoses and for doctors to explain to parents by comparing the three-dimensional model, thereby solving the current problems of poor measurement accuracy, long time and lack of visualization in clinical medicine for judging head shape.

[0041] In addition, compared with traditional industrial-grade handheld laser scanners, the head scanner provided in the embodiment of the present application is completely shot with a camera lens, which generates less radiation and can reduce the concerns of parents of sick children. On the other hand, the algorithm of the industrial-grade handheld laser scanner is mainly aimed at static objects. Infants and young children facing the laser scanner are prone to shaking and crying quickly, which makes it difficult to complete the laser scanner scanning model. Repeated scanning is required, and the whole process takes 5-30 minutes; while the scanner provided in the embodiment of the present application uses multiple shooting modules to shoot at the same time. Infants and young children only need to sit in a comfortably designed seat 4, without stimulating light, and the measurement can be completed within 1 second, thereby greatly improving the measurement and diagnosis efficiency.

[0042] In addition, the setting of the lifting mechanism facilitates the reasonable adjustment of the height of the dome device 3 according to the height of infants, which is beneficial to improving the accuracy of head shape detection for infants of different heights, and there is no need to adjust the position of the infant, which can reduce stimulation to the infant, thereby helping to improve measurement and diagnosis efficiency.

[0043] Of course, the head scanner may not include the seat 4 , and the existing child seat may be directly placed under the dome device 3 for use.

[0044] In some exemplary embodiments, the dome device 3 further includes a calibrator (not shown in the figure), which is used to calibrate the multiple camera modules 32. This can improve the accuracy of the generated three-dimensional model.

[0045] In some embodiments, the calibrator includes a tetrahedron with a calibration pattern, which is connected to the top of the housing and is located in the detection space 34. A tetrahedron is a triangular pyramid, which is composed of four triangles, and each of the three faces has a common point. Exemplarily, the calibration pattern can be a chessboard or a dot pattern. In order to distinguish the orientation, different colors of chessboard positions or points can be set in the chessboard or dot pattern, or the width and height of the chessboard or dot pattern can be set to be different.

[0046] During the actual detection process, when at least one side of the tetrahedron is photographed by at least one camera module 32, the camera module that photographs at least one side of the tetrahedron can be set as a reference position, and the reference point is marked in the reference picture taken by the reference position. The remaining camera modules shoot the target picture containing the reference point, and the reference coordinates of the reference point in the reference picture and the coordinates in each target picture are determined respectively. According to the reference coordinates of the reference point in the reference picture and the coordinates in each target picture, the correction parameters of each target picture relative to the reference picture are calculated, and the target picture is corrected with the correction parameters. In this way, the calibration of multiple camera modules 32 is completed.

[0047] In some exemplary embodiments, the dome device 3 further includes a fill light (not shown in the figure). The fill light can ensure that the light source environment in the detection space 34 of the dome device 3 is stable and the light is sufficient, thereby reducing the steps of adjusting the photographing parameters of the photographing module 32.

[0048] In some embodiments, the number of fill lights may be, but is not limited to, at least three. The multiple fill lights are evenly distributed in the housing to ensure uniform ambient light inside the dome device 3 and no shadow on the head of the infant in the center of the detection space 34.

[0049] In some exemplary embodiments, the camera module 32 includes a camera (not shown in the figure) and a single chip microcomputer (not shown in the figure) electrically connected to the camera. The single chip microcomputer is configured to control the camera and transmit the camera's shooting results back to a display control terminal (not shown in the figure). The display control terminal can be, but is not limited to, a computer. The display control terminal can be included in the head scanner itself and sold as a supporting device, or it can be already owned by the user but can be installed with software that is compatible with the head scanner.

[0050] The camera can be an RGB camera. The lens of the RGB camera can be a normal lens or a wide-angle lens, and the wide-angle lens has a better effect. The RGB camera can also be an RGBD depth camera. The single-chip microcomputer can be connected to the display control terminal via a network cable. The single-chip microcomputer can be equipped with an operating system and a client control system can be deployed to control the camera to perform actions such as power on / off, focus, and take pictures, and transmit the captured video or image to the display control terminal in real time.

[0051] The depth of field and focal length of all camera lenses are uniformly fixed and do not need to be adjusted unless necessary. If necessary, they can be adjusted through the display control terminal.

[0052] In some exemplary embodiments, the number of the camera modules 32 is at least 20. The more the number of the camera modules 32 is, the more and more accurate the scanning data provided are, and thus the accuracy of the generated three-dimensional model is higher.

[0053] In some exemplary embodiments, among the plurality of camera modules 32:

[0054] 1 to 4 camera modules 32 are configured to detect the environment in the detection space 34 to detect whether the head to be detected is located at a set position in the detection space 34, ensuring that the infant's head is located at a suitable position in the detection space and that random shaking does not affect the shooting of the camera module.

[0055] At least 20 camera modules 32 are configured to simultaneously photograph the head to be tested.

[0056] Among them, the camera module 32 used to detect the environment in the detection space 34 of the dome device 3 can be used only to detect the environment in the detection space 34 of the dome device 3, and can also be used to photograph the head to be tested, which is beneficial to reduce the number of camera modules 32 and further reduce costs.

[0057] The images captured simultaneously by at least 20 camera modules 32 can provide rich and accurate scanning data, thereby being able to calculate and reconstruct a head model with higher accuracy.

[0058] In some exemplary embodiments, Figures 4 to 6As shown, the plurality of camera modules 32 are divided into multiple layers along the height direction of the shell. Each layer of camera modules 32 includes multiple camera modules 32 spaced apart along the circumference of the shell. The camera modules 32 of adjacent layers may be staggered along the circumference of the shell.

[0059] Compared with a camera module 32 having only one layer, a multi-layer camera module 32 can provide images from more viewing angles, thereby facilitating further improving the accuracy of the generated three-dimensional head model.

[0060] In one embodiment, Figures 4 to 6 As shown, there are 24 camera modules 32, which are divided into three layers. There are 12 camera modules 32 evenly distributed on the bottom layer, 8 camera modules 32 evenly distributed on the middle layer, and 4 camera modules 32 distributed on the top layer. The 4 camera modules 32 on the top layer can be used to detect the environment in the detection space 34 of the dome device 3. The 20 camera modules 32 on the middle layer and the bottom layer can be used to capture head images from different perspectives.

[0061] In some exemplary embodiments, the housing includes an inner shell 311 (eg, Figures 4 to 6 ) and the outer cover 312 (as shown Figure 7 and Figure 8 The outer cover 312 is disposed on the inner shell 311 and encloses an installation space (not shown in the figure) with the inner shell 311, and multiple camera modules 32 are located in the installation space. The inner shell 311 is provided with multiple shooting ports 3111, such as Figure 5 As shown, the multiple shooting ports 3111 are arranged corresponding to the cameras of the multiple camera modules 32 .

[0062] The inner shell 311 can be used as a skeleton, and the camera module 32, the calibrator, the fill light and other components can be installed on the inner shell 311 by means of fasteners (such as screws), gluing, clamping and the like. The outer cover 312 is mainly used as a decorative part to ensure the integrity and aesthetics of the dome device 3. The shooting port 3111 on the inner shell 311 ensures that the camera module 32 in the installation space can capture the image of the head to be measured in the dome device 3.

[0063] In some exemplary embodiments, Figure 4 As shown, the lower end of the inner shell 311 is provided with a flange 3112. The flange 3112 is folded upward to form an annular receiving groove 3113. The lower end of the outer cover 312 is inserted into the receiving groove 3113 and connected to the inner shell 311. The lower end of the outer cover 312 can be connected to the inner shell 311 by means of snap connection, fastener connection, etc. The aforementioned bottom camera module 32 can be located in the receiving groove 3113, as shown in FIG. Figure 4 shown.

[0064] The top of the outer cover 312 is provided with an upper vent 3121. Figure 7 and Figure 8The bottom of the receiving groove 3113 is provided with a lower vent 3117, as shown in FIG. Figure 5 The upper vent 3121 facilitates heat dissipation of the camera module 32 located at the upper position. The lower vent 3117 facilitates heat dissipation of the camera module 32 located at the lower position. This helps to ensure that the temperature of the entire dome device 3 is not too high, so that the head scanner can operate in a stable environment.

[0065] In some embodiments, Figure 4 and Figure 6 As shown, a plurality of spaced card plates 3114 are provided in the receiving groove 3113, and a camera module 32 is provided between adjacent partitions. A step groove 3119 is provided at the radial outer end of the card plate 3114. A plurality of card slots 3124 are provided at intervals at the lower end of the outer cover 312. Figure 7 As shown, a plurality of card slots 3124 are arranged in one-to-one correspondence with a plurality of card plates 3114. The lower end of the outer cover 312 is inserted into the card plate 3114 through the step groove 3119, and the card plate 3114 is inserted into the corresponding card slot 3124.

[0066] In some embodiments, Figure 5 , Figure 7 and Figure 8 As shown, both the upper vent 3121 and the lower vent 3117 may include multiple circles of through holes distributed in a ring array. The aperture of the multiple circles of through holes gradually decreases from the middle to both sides. In other words, among the multiple circles of through holes, the aperture of the through holes located in the radial middle area is relatively large, and the aperture of the through holes located radially outside and the through holes located radially inside is relatively small. The through holes with larger apertures can face the radial middle of the installation space, which is convenient for rapid heat dissipation.

[0067] In some embodiments, a ventilation component 33 is further provided in the installation space, such as Figure 4 and Figure 6 The ventilation component 33 may be, but is not limited to, a fan. The ventilation component 33 can achieve active heat dissipation, which is beneficial to improving the heat dissipation efficiency of the dome device 3.

[0068] In one embodiment, the number of ventilation components 33 is four. Figure 4 and Figure 6 As shown, four ventilation components 33 are arranged at the top of the installation space.

[0069] In some exemplary embodiments, the bottom of the shell is wrapped with soft rubber, and the bottom of the shell is provided with rounded corners, which can play a buffering role in the event of a collision and improve the safety of the measurement process.

[0070] In some exemplary embodiments, the outer contour of the dome device 3 is hemispherical. Figures 1 to 3 The lifting mechanism includes: an arc-shaped connecting member 51 and a slide 52, as shown in FIG. Figures 1 to 3 , Fig. 9 and Fig.10 shown.

[0071] The arc-shaped connecting member 51 is adapted to the outer contour of the dome device 3, such as Figures 1 to 3 As shown. The upper end of the arc-shaped connecting member 51 is fixedly connected to the top of the shell, and the lower end of the arc-shaped connecting member 51 is limitedly matched with the bottom of the shell. In this way, the arc-shaped connecting member 51 and the dome device 3 have two supporting structures, which is conducive to preventing the dome device 3 from shaking, tilting, etc., thereby improving the stability and reliability of the dome device 3.

[0072] The slide 52 is fixedly connected to the arc-shaped connecting member 51 and is slidably connected to the support rod 2 , so that the arc-shaped connecting member 51 and the dome device 3 are lifted and lowered by sliding of the slide 52 .

[0073] As for the specific connection method between the arc-shaped connecting member 51 and the housing, and the limiting matching method between the arc-shaped connecting member 51 and the housing, there is no restriction.

[0074] In one embodiment, Figure 4 and Figure 6 As shown, a connecting plate 3116 is provided at the top of the inner shell 311. The connecting plate 3116 can be fixed to the top of the inner shell 311 by means of fasteners such as screws. The middle of the connecting plate 3116 bulges upward to form a U-shaped structure 3118 with an opening facing downward. The outer cover 312 is provided with an avoidance notch 3122, as shown in FIG. Figure 7 and Figure 8 The U-shaped structure 3118 passes through the avoidance gap 3122 and protrudes from the outer cover 312. The upper end of the arc-shaped connecting member 51 is provided with a connecting boss 511, as shown in FIG. Fig. 9 and Fig.10 The connecting boss 511 is fixedly connected to the upper end of the U-shaped structure 3118 by fasteners. The inner side wall of the receiving groove 3113 at the bottom of the inner shell 311 is provided with a positioning column 3115 extending radially outward, as shown in FIG. Figure 6 The outer cover 312 is provided with a corresponding avoidance hole 3123, as shown in FIG. Figure 7 The lower end of the arc-shaped connecting member 51 is provided with a positioning groove 512, as shown in FIG. Fig. 9 and Fig.10 The positioning column 3115 passes through the avoidance hole 3123 and is inserted into the positioning groove 512 to achieve the limiting cooperation between the housing and the arc-shaped connecting member 51 .

[0075] In some embodiments, Fig. 9 and Fig.10As shown, the slide 52 is an annular structure and is sleeved on the outside of the support rod 2. The support rod 2 is provided with a slide groove (not shown in the figure) extending along its height direction, and the inner wall of the slide 52 is provided with a slide rail (not shown in the figure), which is inserted into the slide groove to guide the sliding of the slide 52. The cross section of the support rod 2 can be a rounded rectangle, and the slide groove can be set on the back of the support rod 2, which is conducive to improving the aesthetics of the product.

[0076] In some exemplary embodiments, the lifting mechanism further includes: a driving device (not shown in the figure) and a control device. The driving device is connected to the slide 52 and is configured to drive the slide 52 to slide relative to the support rod 2. The control device is electrically connected to the driving device and is configured to control the action of the driving device to adjust the position of the slide 52.

[0077] In this way, the doctor does not need to manually drive the slide 52 to slide to adjust the height of the dome device 3, which is beneficial to improving the doctor's usage experience and measurement and detection efficiency.

[0078] The specific form of the driving device is not limited. In some embodiments, the driving device includes a driving member and a transmission assembly. The driving member is a power source. The driving member can be, but is not limited to, a motor. The motor can be arranged in the base 1. The transmission assembly can be in the form of a gear rack assembly, a screw nut assembly, etc. For example: the gear is connected to the output shaft of the motor, the rack is fixedly connected to the slide 52 (the guide rail inserted into the support rod 2), and meshes with the gear, and the rotation of the motor can drive the rack up and down, thereby driving the slide 52 to rise and fall. Alternatively, one end of the screw is connected to the output shaft of the motor, and the other end is rotatably connected to the support rod 2, the nut is screwed with the screw thread and fixedly connected to the slide 52 (the guide rail inserted into the support rod 2), and the nut is limited in the support rod 2 and cannot rotate relative to the support rod 2 (for example, the outer contour of the nut is also a rounded rectangle and is matched with the inner wall surface of the support rod 2), then the rotation of the motor can drive the nut to rise and fall, thereby driving the slide 52 to rise and fall.

[0079] In some exemplary embodiments, the control device includes an operation panel disposed on the support rod 2, such as Figure 1 , Figure 2 , Figure 3 and Fig. 9 The operation panel is provided with at least one of the following: an up key, a down key, a top reset key, a middle reset key and an emergency stop key. The operation panel can be provided on the side of the support rod 2 (such as the right side), such as Figure 1 , Figure 2 , Figure 3 and Fig. 9 As shown, it is convenient for the doctor to stand on one side of the support rod 2 and observe the position of the dome device 3 while performing the operation.

[0080] The up key is configured to be triggered to slide the slide 52 up. The up key can be controlled by tapping to gradually and slowly raise the slide 52 to achieve fine adjustment of the position of the slide 52; of course, the slide 52 can also be continuously raised by long pressing.

[0081] The down key is set to be triggered to slide the slide 52 down. The down key can be controlled by clicking to gradually and slowly lower the slide 52 to achieve fine adjustment of the position of the slide 52; of course, the slide 52 can also be continuously lowered by long pressing.

[0082] The top reset button is configured to be triggered to reset the slide 52 to the top setting position of the support rod 2. When the head scanner is used, the slide 52 can be reset to the top setting position by the top reset button, so that the dome device 3 rises to a relatively high position to avoid being bumped by people or other things. The top setting position can be the upper end of the slide slot.

[0083] The middle reset key is configured to be triggered to reset the slide 52 to the middle setting position of the support rod 2. When the head scanner needs to be used continuously, the slide 52 can be reset to the middle setting position by the middle reset key, and then the height of the dome device 3 can be fine-tuned and precisely controlled by the up key or the down key, which is conducive to quickly adjusting the dome device 3 to a suitable position during continuous use, thereby improving the measurement and detection efficiency. The middle setting position can be the middle position of the slide slot.

[0084] The emergency stop button is set to be triggered to stop the drive device. The emergency stop button can make the drive device stop urgently to prevent lifting accidents.

[0085] In some exemplary embodiments, an operation panel is provided on the side of the support rod 2, such as Figure 1 , Figure 2 , Figure 3 and Fig. 9 The operation panel is provided with a power key and a camera key. The power key is configured to control the dome device 3 to be powered on and off; the camera key is configured to control the multiple camera modules 32 to take photos.

[0086] When the power key is pressed, the camera module 32, fill light and other electrical components of the dome device 3 are powered on, and the fill light can be normally turned on after being powered on. After use, the power of the dome device 3 can be turned off by the power key. The power key can be controlled by, but not limited to, tapping, long pressing, etc. The camera key can realize one-touch shooting.

[0087] In some exemplary embodiments, the base 1 is provided with a roller 11, such as Figure 2 and Figure 3As shown. This facilitates the movement of the head scanner to move in different consulting rooms. The number of rollers 11 can be but is not limited to four. Of course, the base 1 can also be provided with a support foot 12, such as Figure 2 and Figure 3 The support foot 12 can also be adjusted.

[0088] In some exemplary embodiments, a power supply circuit (not shown in the figure) is also provided in the base 1, which can improve the overall aesthetics of the scanner. A main power socket (not shown in the figure) and a main switch (not shown in the figure) can also be provided on the lower back of the base 1, so that they are not easily touched when operating the head scanner, causing scanning interruption.

[0089] The switch on the operation panel may also be omitted. When the main switch is turned on, the fill light is turned on at the same time, and the camera module 32 is powered on.

[0090] In some exemplary embodiments, a detachable protection bar 41 is provided at the front of the seat 4. Fig.11 and Fig.12 As shown. The protection rod 41 can protect small-age infants and young children, play a fixing role, stabilize the infants and young children, reduce shooting errors caused by shaking infants and young children, and help improve shooting efficiency. The protection rod 41 can be roughly T-shaped.

[0091] In some exemplary embodiments, the rear portion of the seat 4 is provided with a raised portion 42, such as Fig.11 and Fig.12 The raised portion 42 is configured to support the back and neck of the child to be tested. The raised portion 42 can properly support the neck of the infant without covering the neck and affecting the shooting.

[0092] In some exemplary embodiments, the seat 4 is connected to the base 1 through the columns 43 on both sides. Figure 1 and Figure 3 The seat 4 may be detachable for easy replacement. Slots 44 may be provided on both sides of the seat 4, such as Figures 11 to 13 The top of the column 43 can be removably inserted into the slot 44. The two columns 43 can be connected by a U-shaped connecting column, such as Figures 1 to 3 As shown, the U-shaped connecting column supports the outer side of the seat 4 to ensure the stability of the seat 4.

[0093] The slot 44 may be substantially in the shape of a triangular prism, such as Fig.13 The top of the column 43 may be provided with an adaptable tip to facilitate quick insertion of the column 43 .

[0094] In some exemplary embodiments, the seat 4 is wrapped in soft leather to increase comfort. The backrest height of the seat 4 is about 17 cm, suitable for infants aged 3-18 months, the width of the seat is about 27 cm, and the length of the seat is about 24 cm; there is a protrusion of about 4 cm in the middle of the backrest, that is, the ridge 42, which can properly support the neck of the infant without covering the neck and affecting the shooting. The parents of the child can sit facing the infant and hold the infant, which can reduce the anxiety of the infant and make the scanning process easier.

[0095] In some exemplary embodiments, the total length of the support rod 2 is about 180 cm, and the control panel 21 is located at about 90 cm. This length design is ergonomically designed, which is convenient for an adult to stand and operate the instrument, ensuring that the dome device 3 can be observed while pressing the buttons, and ensuring that the dome device 3 moves to a suitable position to completely cover the head of an infant.

[0096] In some exemplary embodiments, the head scanner further includes: a display control terminal (not shown in the figure), which is electrically connected to the multiple camera modules 32 and is configured to generate and display a three-dimensional model of the head to be measured based on the images captured by the multiple camera modules 32. The display control terminal includes a processor, and the processor has an algorithm program built in it, which can reconstruct the images captured by the multiple camera modules 32 received according to the algorithm to generate a three-dimensional model of the head. The display control terminal is also electrically connected to the control panel 21. The display control terminal can be, but is not limited to, a computer.

[0097] All camera modules 32 can be connected to a main power line through the connection center, and then connected to the camera key through the circuit control system. When the camera key is triggered, the camera module 32 takes a photo. All camera modules 32 can be connected to a network cable through the connection center, and the network cable is connected to the display control terminal to synchronously transmit the captured image to the display control terminal.

[0098] The display control terminal is set up in conjunction with the head scanner to complete real-time monitoring, image collection, image processing, and image stitching, and ultimately achieve visualization of head scan data.

[0099] Of course, the head scanner may not include a display control terminal, and the corresponding software may be directly installed on the existing display control terminal and electrically connected to the corresponding components of the head scanner.

[0100] When the head scanner is turned on, the display control terminal needs to be turned on at the same time, and the control system of the head scanner needs to be logged in. The display control terminal acts as a server, and the camera module 32 acts as a client. The server sends a request to the client to ensure the normal operation of the client. The server controls the client to take photos and videos in parallel, and all camera modules 32 complete the photo taking at the same time within 1 second and transmit it back to the server. The control system will display the real-time image in the detection space 34 of the dome device 3 in real time. When adjusting the position of the dome device 3, there is a real-time image on the computer screen to observe whether the dome device 3 has reached the most suitable position. Press the camera button, the server sends a request to the client, controls the camera module 32 to take and transmit the taken image back, and stores it in the control system. The 3D reconstruction algorithm starts running at the same time, analyzes and splices the taken images, and finally forms a three-dimensional head model, which is displayed on the display of the display control terminal.

[0101] In some exemplary embodiments, the display control terminal includes a processor, and the processor is configured to:

[0102] Acquire images captured by multiple camera modules and pre-process the acquired images;

[0103] Extract feature points from the preprocessed image;

[0104] Perform feature matching on the extracted feature points to establish the relative positions and directions of multiple camera modules;

[0105] Reconstruct the three-dimensional point cloud data of the shooting target based on the feature point information and camera parameters of multiple images;

[0106] The 3D point cloud data is optimized, the optimized 3D point cloud data is reconstructed into a 3D mesh model, and texture mapping is performed on the 3D mesh model.

[0107] The present disclosure preprocesses the acquired images so that all images have a unified image input condition. In some exemplary embodiments, the preprocessing includes any one or more of the following:

[0108] Correct lens distortion, adjust image color parameters, remove blemishes, crop and adjust, etc.

[0109] Some lenses are prone to distortion when shooting, such as fisheye effect, bending, deformation, etc. By correcting lens distortion, the image can be made more realistic and natural. By adjusting image color parameters such as hue, saturation, and brightness, the color effect of the image can be changed to make the image more vivid, gorgeous, or soft. Some defects may appear during the shooting process, such as dust, scratches, and blemishes. By removing the defects, the image can be made more perfect. Through cropping adjustments, useless parts can be deleted.

[0110] In some exemplary embodiments, extracting feature points from the preprocessed image includes:

[0111] Based on all the acquired images, a Gaussian image pyramid and a Gaussian difference pyramid are obtained, and the maximum value point and the minimum value point corresponding to each differential scale space in the Gaussian difference pyramid are calculated, and the calculated maximum value point and minimum value point are used as feature points;

[0112] Assign main directions to feature points;

[0113] Calculate the descriptor of each feature point to make it invariant to illumination and perspective.

[0114] The Gaussian image pyramid is not a pyramid, but is composed of many groups of image pyramids, and each group of image pyramids contains several layers. A total of O groups and S layers of images of different scales are generated in the Gaussian image pyramid. These two quantities together (O, S) constitute the scale space of the Gaussian image pyramid. That is to say, with the group O of the Gaussian image pyramid as a coordinate in the two-dimensional coordinate system and the different layers S as another coordinate, a given set of coordinates (O, S) can uniquely determine an image in the Gaussian image pyramid.

[0115] The Difference of Gaussian (DOG) pyramid is constructed on the basis of the Gaussian image pyramid. The purpose of generating the Gaussian image pyramid is to construct the Gaussian difference pyramid, which is obtained by subtracting the Gaussian scale space images of each group of upper and lower adjacent layers. The first layer of the first group of the Gaussian difference pyramid is obtained by subtracting the first layer of the first group from the second layer of the Gaussian image pyramid. Similarly, each difference image is generated group by group and layer by layer, and all difference images constitute the Gaussian difference pyramid. In summary, the image of the Sth layer of the Oth group of the Gaussian difference pyramid is obtained by subtracting the Sth layer of the Oth group of the Gaussian image pyramid from the S+1th layer of the Oth group. In terms of the number of layers in each group, the Gaussian difference pyramid has one less layer than the Gaussian image pyramid, and the extraction of feature points is all performed on the Gaussian difference pyramid.

[0116] The scale space generated by Gaussian filtering of different scales is used to represent the multi-scale features of the image. The scale space is generated by the Gaussian convolution kernel. The generation method formula is as follows:

[0117] L(x,y,σ)=G(x,y,σ)*I(x,y);

[0118] Where σ is the scale parameter, (x, y) is the spatial coordinate, and the variable-scale Gaussian function I(x, y) is the input image, * represents the convolution operation. The size of the scale parameter σ determines the smoothness of the image. A large scale corresponds to the general features of the image, a small scale corresponds to the detailed features of the image, and σ = 0 corresponds to the original image.

[0119] The Gaussian difference space is constructed by the difference of scale spaces, and the generation method formula is as follows:

[0120] D(x,y,σ)=(G(x,y,kσ)-G(x,y,σ))*I(x,y)=L(x,y,kσ)-L(x,y,σ);

[0121] Where k is a constant that is a multiple of two adjacent scale spaces.

[0122] In some exemplary embodiments, assigning a main direction to a feature point includes:

[0123] By performing gradient and direction operations on the image L(x, y, σ), the gradient direction

[0124] The gradient in each direction is counted and the main direction (i.e. the direction with the largest gradient) is selected to ensure the rotation invariance of the feature points.

[0125] In the disclosed embodiment, the main direction of each feature point can be determined by using the gradient direction distribution characteristics of the neighborhood pixels of the feature point. Specifically, at the Gaussian image pyramid layer where each feature point is located, the gradient magnitude and direction of the feature point and all the pixels in its neighborhood are calculated to form a gradient direction histogram, the horizontal axis of which is the gradient direction and the vertical axis is the gradient magnitude. The direction of the item with the largest vertical coordinate value is selected from the histogram as the main direction of the feature point.

[0126] The descriptor of a feature point is a set of vectors, which include not only the feature point but also the pixels in the neighborhood of the feature point that contribute to it. In the disclosed embodiment, the method for constructing the descriptor of a feature point is as follows: the image area of ​​the neighborhood of the feature point (such as an 8*8 neighborhood) is divided into 4 pixel blocks of 2*2 in size, the gradient histogram of 8 directions in each block is calculated, and the accumulation of each gradient direction is plotted to form a seed point, so that a feature point is composed of the information of 4*4, a total of 16 seed points. In this way, a 128-dimensional vector can be generated for each feature point. This 128-dimensional vector is the descriptor of the feature point, generally also called a SIFT feature vector.

[0127] In some exemplary embodiments, performing feature matching on the extracted feature points includes:

[0128] Select a captured image as a reference image, and construct a kd tree index based on the description vector of the feature point set of the reference image;

[0129] According to the feature points to be matched in the image, the best node is searched first in the kd tree to retrieve the k data points closest to the feature points to be matched;

[0130] If the distance between the nearest neighbor point in the k nearest neighbors and the feature point to be matched is within the preset threshold, and the distance ratio between the nearest neighbor point and the next nearest neighbor point is within the preset threshold, the nearest neighbor point and the feature point to be matched are regarded as a matching feature point pair;

[0131] The random sample statistical method is used to eliminate the wrong matching points from all matching feature point pairs.

[0132] In some exemplary embodiments, reconstructing three-dimensional point cloud data of a photographed target according to feature point information of a plurality of images and camera parameters includes:

[0133] Sort the captured images and divide them into multiple image clusters;

[0134] Build a dense point cloud for each image cluster.

[0135] In some exemplary embodiments, optimizing the three-dimensional point cloud data includes:

[0136] The three-dimensional point cloud data is filtered based on statistical information. Specifically, the overall mean and variance of the three-dimensional point cloud data are first calculated, and then the mean of the neighborhood of each point and the distance from the point to the mean are calculated. If the distance from the point to the mean exceeds a certain threshold (the threshold is determined by the overall mean and variance), the point is considered to be an outlier and needs to be filtered out.

[0137] Rotate the 3D point cloud data to make it parallel to the XY plane of the spatial coordinate system.

[0138] In the disclosed embodiments, three-dimensional point cloud data may be interpolated into a smooth surface and a three-dimensional mesh model may be generated through a point cloud reconstruction algorithm, such as Poisson reconstruction, surface reconstruction, etc.

[0139] In some exemplary embodiments, texture mapping is performed on a three-dimensional mesh model, including:

[0140] Identifying multiple target mapping regions in a three-dimensional mesh model;

[0141] Determine a texture image corresponding to each target texture area from the target texture image based on the correlation between the key points of the face;

[0142] The target mapping area is mapped based on the mapping texture image.

[0143] The scanning method of the head scanner is as follows: the camera body of the head scanner is composed of multiple camera modules 32 to form a hemispherical dome. Each lens is about half a head to one head away from the front, back, left and right sides of the infant's head, and the infant's head is photographed at the same time, and dozens of images are taken in less than 1 second. The algorithm is used to calculate and splice, and finally a 3D model of the head is formed. It should be noted that there needs to be a tetrahedral positioning mark in the dome, and its side is photographed by at least one camera, so as to calibrate the multiple camera modules 32 and complete the algorithm calculation. The scanned data can be stored locally or in a cloud server, and the generated three-dimensional head shape is displayed on the display of the display control terminal.

[0144] The scanning steps of the head scanner are as follows: place the infant on the seat 4 in front of the support rod 2, place the legs on both sides of the protective rod 41 on the seat 4, use the protective rod 41 to stabilize the infant, and the family sits down facing the infant and supports the infant. The medical staff turns on the main switch, turns on the fill light, and connects the camera module 32. Press the middle reset button, and the dome device 3 slides to the middle area of ​​the support rod 2; the medical staff presses the up key and / or down key to fine-tune the position of the dome device 3 according to the actual situation of the infant, ensuring that the infant's head can be placed in the center of the detection space 34 of the dome device 3. Confirm through the computer display that the calibrator appears in the lens and the infant's head can be completely photographed, that is, the front, back, left and right sides of the infant's head are about half a head to one head away from the inner wall of the dome. After confirmation, press the camera button to shoot and complete the scan. If the scanning quality does not meet the requirements, re-adjust the infant's sitting posture, adjust the height of the dome device 3, and press the camera button to scan. If you need to continue using the head scanner, press the middle reset button to reset the dome device 3 to the middle position; if there is no other scanning, press the top reset button to reset the dome device 3 to the top, and then turn off the main switch.

[0145] In summary, the head scanner provided in the embodiment of the present application can quickly acquire a stable, high-precision 3D model of the infant's head for detecting abnormalities of the head, thereby providing a basis for judgment for head shape correction. Compared with the angle gauge used in clinical applications, it can provide more accurate scanning data, which can be directly stored locally or in a cloud server, and the three-dimensional head shape can be directly displayed on the screen, so that the doctor can explain and analyze it to the patient more intuitively. Compared with the traditional industrial-grade handheld laser scanner, this head scanner uses a full camera lens to shoot, which produces less radiation and can reduce the concerns of parents of sick children; on the other hand, the algorithm of the industrial-grade handheld laser scanner is mainly aimed at static objects. Infants and young children face the laser scanner and are prone to shaking and crying quickly, which makes it difficult to complete the laser scanner scanning model. Repeated scanning is required, and the whole process takes 5-30 minutes; this scanner uses multiple sets of shooting modules to shoot at the same time. Infants and young children only need to sit in a comfortably designed seat, without stimulating light, and the measurement can be completed within 1 second, which can greatly improve the efficiency of measurement and diagnosis.

[0146] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "mouth structure" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred structure has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0147] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0148] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0149] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates a computer program, such as any medium transmitted from one place to another according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0150] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, or Blu-ray disks, etc., where disks typically reproduce data magnetically, while optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0151] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functionality described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.

[0152] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described techniques, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of interoperable hardware units (including one or more processors as described above) in combination with suitable software and / or firmware.

[0153] Although the embodiments disclosed in the present application are as above, the described contents are only embodiments adopted for facilitating understanding of the present application, and are not intended to limit the present application. It should be noted that the above embodiments or embodiments are merely exemplary, and not restrictive. Therefore, the present application is not limited to the contents specifically shown and described herein. Various modifications, substitutions or omissions may be made to the forms and details of implementation without departing from the scope of the present application.

Claims

1. A head scanner, characterized in that: include: Base; A support rod, erected on the base; A dome device is arranged above the base, the dome device comprises a shell and a plurality of camera modules arranged at intervals on the shell, the shell encloses a detection space for accommodating a head to be measured, the plurality of camera modules are arranged to take photos of the head to be measured at multiple angles, and the images taken by the plurality of camera modules are used to generate a three-dimensional model of the head to be measured; and The lifting mechanism is fixedly connected to the dome device and slidably connected to the support rod, and is configured to adjust the height of the dome device.

2. The head scanner according to claim 1, characterized in that The dome device also includes a calibrator, which is used to calibrate the multiple camera modules.

3. The head scanner according to claim 2, characterized in that The calibrator comprises a tetrahedron provided with a calibration pattern, wherein the tetrahedron is connected to the top of the shell and is located in the detection space.

4. The head scanner according to any one of claims 1 to 3, characterized in that The camera module includes a camera and a single chip microcomputer electrically connected to the camera, wherein the single chip microcomputer is configured to control the camera and transmit the camera's shooting result back to the display control terminal; and / or The dome device also includes a fill light.

5. The head scanner according to any one of claims 1 to 3, characterized in that: The number of the camera modules is at least 20; and / or The plurality of camera modules are divided into multiple layers along the height direction of the shell, and each layer of the camera modules includes multiple camera modules spaced apart along the circumference of the shell.

6. The head scanner according to any one of claims 1 to 3, characterized in that: Among the multiple camera modules: One to four of the camera modules are configured to detect the environment in the detection space to detect whether the head to be detected is located at a set position in the detection space; At least 20 of the camera modules are configured to simultaneously photograph the head to be tested.

7. The head scanner according to any one of claims 1 to 3, characterized in that The shell includes an inner shell and an outer cover, the outer cover is arranged on the inner shell and encloses an installation space with the inner shell, and the multiple camera modules are located in the installation space; the inner shell is provided with a plurality of shooting ports, and the plurality of shooting ports are arranged corresponding to the cameras of the plurality of camera modules.

8. The head scanner according to claim 7, characterized in that: The lower end of the inner shell is provided with a flange, the flange is folded upward to form an annular receiving groove, the lower end of the outer cover is inserted into the receiving groove and connected to the inner shell; An upper vent is provided at the top of the outer cover, and a lower vent is provided at the bottom of the receiving groove.

9. The head scanner according to any one of claims 1 to 3, characterized in that: The outer contour of the dome device is hemispherical, and the lifting mechanism includes: An arc-shaped connecting piece adapted to the outer contour of the dome device, the upper end of the arc-shaped connecting piece being fixedly connected to the top of the shell, and the lower end of the arc-shaped connecting piece being limitedly matched with the bottom of the shell; and The slide is fixedly connected to the arc-shaped connecting member and slidably connected to the supporting rod.

10. The head scanner according to claim 9, characterized in that The lifting mechanism also includes: A driving device connected to the slide table and configured to drive the slide table to slide relative to the support rod; and The control device is electrically connected to the driving device and is configured to control the action of the driving device to adjust the position of the slide.

11. The head scanner according to claim 10, characterized in that The control device comprises an operation panel arranged on the support rod, and the operation panel is provided with at least one of the following: an up key, a down key, a top reset key, a middle reset key and an emergency stop key; The ascending key is configured to be triggered to cause the slide table to slide upward; The descending key is configured to be triggered to cause the slide to slide downward; The top reset button is configured to be triggered to reset the slide to the top set position of the support rod; The intermediate reset button is configured to be triggered to reset the slide to the middle set position of the support rod; The emergency stop button is configured to be triggered to stop the driving device.

12. The head scanner according to any one of claims 1 to 3, characterized in that: An operation panel is provided on the side of the support rod, and the operation panel is provided with a switch key and a camera key; the switch key is configured to control the power on and off of the dome device; the camera key is configured to control the multiple camera modules to take photos; and / or The base is provided with rollers.

13. The head scanner according to any one of claims 1 to 3, characterized in that: Also includes: a seat, located below the dome device; Wherein, a detachable protective rod is provided at the front of the seat; and / or A raised portion is provided at the rear of the seat, and the raised portion is configured to support the back and neck of the child to be tested.

14. The head scanner according to any one of claims 1 to 3, characterized in that: Also includes: The display control terminal is electrically connected to the multiple camera modules and is configured to generate and display the three-dimensional model of the head to be measured according to the images taken by the multiple camera modules.

Images