A model acquisition system

Abstract

The utility model embodiment provides a kind of model acquisition system, comprising: control computer, main controller, trigger switch and data acquisition unit;The control computer generates start-stop signal;The trigger switch generates on-off signal;The main controller is electrically connected with the control computer and the trigger switch respectively, for based on the start-stop signal received, output synchronization instruction signal;Based on the on-off signal received, output acquisition instruction signal;The data acquisition unit is used for based on the synchronization instruction signal, the synchronization of the acquisition timing of acquisition unit is carried out;And based on the acquisition instruction signal, the acquisition of model is carried out.

Description

Technical Field

[0001] This utility model relates to the field of model acquisition, and in particular to a model acquisition system. Background Technology

[0002] Human body 3D model acquisition typically employs optoelectronic equipment for scanning, such as 3D scanners and camera arrays. 3D scanners usually require the subject to remain still for a period of time. An operator holds the scanner handheld, scanning around the subject in specific areas, and then automatically stitching the images together using software. Because this requirement for the subject to remain still for a period of time limits its application in certain scenarios. Utility Model Content

[0003] The embodiments of this utility model provide a model acquisition system that improves upon and solves the above-mentioned problems.

[0004] A model acquisition system, comprising: Control computer, main controller, trigger switches and data acquisition unit; The control computer generates start / stop signals; The trigger switch generates a switching signal; The main controller is electrically connected to the control computer and the trigger switch, respectively, and is used to output a synchronization command signal based on the received start / stop signal; and to output a data acquisition command signal based on the received switch signal. The data acquisition unit is used to synchronize the acquisition timing of the acquisition unit based on the synchronization command signal; and to acquire the model based on the acquisition command signal.

[0005] The control computer is also used to be electrically connected to the data acquisition unit and to store the data acquired by the data acquisition unit.

[0006] The data acquisition unit comprises at least three units, which are respectively installed on the left and right gateposts and the gate beam of the security gate; and / or

[0007] The trigger switch is located on the ground at a predetermined distance in front of the security gate.

[0008] The trigger switch is a push-button switch or a non-contact photoelectric switch.

[0009] The main controller includes a CAN bus controller, which sends the synchronization command signal via the CAN bus. The data acquisition unit includes a node controller, an infrared camera, an RGB camera, and an infrared structured light projector; The node controller receives the synchronization command signal via the CAN bus and triggers the infrared camera, the RGB camera, and the infrared structured light projector to work synchronously according to the synchronization command signal.

[0010] The two infrared cameras are distributed on both sides of the infrared structured light projection. The two RGB cameras are distributed on both sides of the infrared structured light projection.

[0011] The infrared camera consists of a monochrome industrial camera combined with a narrowband infrared filter; and / or

[0012] The infrared camera uses a global electronic shutter and operates in silent mode.

[0013] The infrared structured light projection consists of an infrared light source, a structured light projection sheet, and a lens. The wavelength of the infrared light source matches the wavelength of the infrared camera's filter; or The structured light projection sheet is etched with random codes.

[0014] Each of the data acquisition units is serially connected via a CAN bus, and each data acquisition unit has a different CAN bus address.

[0015] The data acquisition unit is rigidly installed at the channel opening with a closed structure, and the panel of the data acquisition unit is provided with a semi-permeable membrane.

[0016] As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, it is not necessary for the person or object being collected to remain still for a period of time to collect the model (especially the three-dimensional model); it is very flexible, has a high degree of compatibility, and can be suitable for more usage scenarios. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the electrical connections of the model acquisition system of this utility model; Figure 2 This is a schematic diagram of another embodiment of the model acquisition system of this utility model; Figure 3 This is a schematic diagram of the installation of the model acquisition system of this utility model. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] To facilitate understanding of the embodiments of this utility model, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of this utility model.

[0021] Figure 1 This is a schematic diagram of the electrical connections of the model acquisition system of this utility model; Figure 2 This is a schematic diagram of another embodiment of the model acquisition system of this utility model; Figure 3 This is a schematic diagram of the installation of the model acquisition system of this utility model. The following description is based on the figures.

[0022] like Figure 1 As shown, a model acquisition system according to this utility model includes: Control computer 1, main controller 2, trigger switch 3, and data acquisition unit 4; The control computer generates start / stop signals; The trigger switch generates a switching signal; The main controller is electrically connected to the control computer and the trigger switch, respectively, and is used to output a synchronization command signal based on the received start / stop signal; and to output a data acquisition command signal based on the received switch signal. The data acquisition unit is used to synchronize the acquisition timing of the acquisition unit based on the synchronization command signal; and to acquire the model based on the acquisition command signal.

[0023] The system described in this invention does not require the person being sampled to remain still for a period of time, making it suitable for a wider range of applications.

[0024] The control computer is also used to be electrically connected to the data acquisition unit and to store the data acquired by the data acquisition unit.

[0025] The acquisition unit includes at least three units, which are respectively installed on the left and right doorposts and door beam of the security gate, so that a three-dimensional model can be acquired.

[0026] Optionally, the trigger switch is located on the ground at a predetermined distance in front of the security gate. This way, once the person being sampled passes the predetermined distance in front of the security gate, they will step on the trigger switch 3, thereby triggering the system to collect data.

[0027] The trigger switch is a push-button switch or a non-contact photoelectric switch.

[0028] The main controller includes a CAN bus controller, which sends the synchronization command signal via the CAN bus. The data acquisition unit includes a node controller, an infrared camera, an RGB camera, and an infrared structured light projector; The node controller receives the synchronization command signal via the CAN bus and triggers the infrared camera, the RGB camera, and the infrared structured light projector to work synchronously according to the synchronization command signal.

[0029] The two infrared cameras are distributed on both sides of the infrared structured light projection. The two RGB cameras are distributed on both sides of the infrared structured light projection.

[0030] The infrared camera consists of a monochrome industrial camera combined with a narrowband infrared filter; and / or

[0031] Optionally, the infrared camera employs a global electronic shutter and operates in silent mode. This ensures that it operates without making any noise.

[0032] This invention features silent operation, no visible light, and concealed installation and acquisition capabilities, which can solve the problem that existing 3D scanners and camera arrays require the cooperation of the person being acquired, thereby realizing concealed acquisition of 3D human body models.

[0033] The infrared structured light projection consists of an infrared light source, a structured light projection sheet, and a lens. The wavelength of the infrared light source is the same as that of the infrared camera's filter so that the infrared camera can receive the signal.

[0034] The structured light projection sheet is etched with random codes.

[0035] Each of the data acquisition units is serially connected via a CAN bus, and each data acquisition unit has a different CAN bus address.

[0036] The data acquisition unit is rigidly installed at the channel opening with a closed structure, and the panel of the data acquisition unit is provided with a semi-permeable membrane.

[0037] The following describes the application scenarios of this utility model.

[0038] In some applications, it is often necessary to acquire a concealed, unobtrusive 3D model of the object being measured. Conventional methods often suffer from problems such as large size and the presence of audio-visual stimuli, which can easily cause resistance from the object being measured. This invention provides a concealed 3D human body model acquisition system that can acquire 3D information without the object being measured noticing or perceiving it.

[0039] like Figure 2 As shown, a concealed human body 3D model acquisition system consists of a control computer 1, a main controller 2, a trigger switch 3, and several data acquisition units 4.

[0040] Control computer 1 runs control software with a human-machine interface, allowing control of the start and stop of data acquisition. The control computer is equipped with several USB 3.0 expansion cards 1-1, which can be directly connected to the camera. Control computer 1 is also responsible for storing the acquired data. Control computer 1 is connected to the main controller 2 via a USB interface.

[0041] Main controller 2 is primarily responsible for the synchronous control of the entire system. Main controller 2 is equipped with a USB-to-serial port controller 2-1, which can receive start / stop signals from the main control computer 1 and send synchronous control commands via the CAN bus controller 2-2 to synchronize the acquisition timing of several data acquisition units 4. Main controller 2 can also receive switching signals from trigger switch 3 and trigger acquisition control operations.

[0042] Trigger switch 3 serves to trigger the data acquisition. The trigger switch can be a push-button switch, a non-contact photoelectric switch, or other types of switches. Once the object being acquired triggers trigger switch 3, a switching signal is generated. The system then detects this and acquires one frame of image or a series of frames (depending on the settings of the control computer).

[0043] Data acquisition unit 4 is the execution unit for directly acquiring 3D data from the human body. Data acquisition unit 4 consists of a node controller 4-1, two infrared cameras 4-2, two RGB cameras 4-3, and one infrared structured light projector 4-4, along with corresponding structural components. The node controller 4-1 receives signals from the CAN bus and triggers the two infrared cameras 4-2, two RGB cameras 4-3, and one infrared structured light projector 4-4 to work synchronously according to bus commands. The two infrared cameras 4-2 are distributed on both sides of the infrared structured light projector 4-4. Each infrared camera 4-2 consists of a monochrome industrial camera with a narrowband infrared filter and uses a global electronic shutter, operating silently. The infrared structured light projector 4-4 consists of an infrared light source, a structured light projector, and a lens. The wavelength of the infrared light source matches the wavelength of the infrared camera filter to ensure signal reception. The structured light projector is etched with random codes, which can enhance the feature point recognition in computer vision. Two RGB cameras 4-3 are also distributed on both sides of the infrared structured light projection 4-4. The RGB cameras work synchronously with the infrared cameras, but the infrared cameras can only collect signals in the visible light band and filter out infrared light, thus they are not affected by the infrared structured light projection 4-4. The two infrared cameras and two RGB cameras in the data acquisition unit 4 all use USB 3.0 interfaces and are directly connected to the USB expansion card 1-1 for control and computing. Several data acquisition units 4 can be serially connected via a CAN bus, with each data acquisition unit 4 having a different CAN bus address for differentiation. Each component in the data acquisition unit 4 is rigidly installed using a corresponding enclosed structure, and a semi-transparent film is coated on the panel, preventing the user from seeing the internal structure of the data acquisition unit, thus providing a degree of concealment. Simultaneously, the data acquisition unit 4 does not emit sound during operation, only emitting infrared light at the moment of acquisition, which cannot be directly seen by the naked eye. Therefore, the acquisition process of this scheme also has a certain degree of concealment.

[0044] like Figure 3 The diagram shown illustrates one possible installation method for this solution. Three data acquisition units 4 are mounted on a security gate, with holes cut into the gate structure to expose the front of each unit. The three units are respectively mounted on the left and right gateposts and the gate beam, with their panels all pointing towards the person being sampled. Once the person being sampled passes 1.5 meters in front of the security gate, they will step on the trigger switch 3, thus triggering the system to collect data.

[0045] In this embodiment, the infrared camera uses an ME2P-1230-23U3M lens with a focal length of 16mm and an 850nm narrowband filter with a bandwidth of ±20nm. The structured light projection uses an 850nm VCSEL laser light source, which has the advantage of high instantaneous emission power. The RGB camera uses an ME2P-1230-23U3C lens with a focal length of 16mm. Based on the configuration calculated by the main controller, the system can set the number of frames for a single trigger acquisition, such as 1 to 100 frames. If set to more than 1 frame, the system will continuously acquire data at a frame rate of 10pfs, thus increasing the probability of capturing the subject's face facing the security gate without the subject noticing.

[0046] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A model acquisition system, characterized in that, include: Control computer, main controller, trigger switches and data acquisition unit; The control computer generates start / stop signals; The trigger switch generates a switching signal; The main controller is electrically connected to the control computer and the trigger switch, respectively, and is used to output a synchronization command signal based on the received start / stop signal; and to output a data acquisition command signal based on the received switch signal. The data acquisition unit is used to synchronize the acquisition timing of the acquisition unit based on the synchronization command signal; and to acquire the model based on the acquisition command signal. The main controller includes a CAN bus controller, which sends the synchronization command signal via the CAN bus. The data acquisition unit includes a node controller, an infrared camera, an RGB camera, and an infrared structured light projector; the node controller is connected to the infrared camera, the RGB camera, and the infrared structured light projector via a CAN bus. The node controller receives the synchronization command signal via the CAN bus and triggers the infrared camera, the RGB camera, and the infrared structured light projector to work synchronously according to the synchronization command signal.

2. The system according to claim 1, characterized in that: The control computer is also used to be electrically connected to the data acquisition unit and to store the data acquired by the data acquisition unit.

3. The system according to claim 1, characterized in that: The data acquisition unit comprises at least three units, which are respectively installed on the left and right gateposts and the gate beam of the security gate; and / or The trigger switch is located on the ground at a predetermined distance in front of the security gate.

4. The system according to claim 1, characterized in that: The trigger switch is a push-button switch or a non-contact photoelectric switch.

5. The system according to claim 1, characterized in that: The two infrared cameras are distributed on both sides of the infrared structured light projection. The two RGB cameras are distributed on both sides of the infrared structured light projection.

6. The system according to claim 1, characterized in that: The infrared camera consists of a monochrome industrial camera combined with a narrowband infrared filter; and / or The infrared camera uses a global electronic shutter and operates in silent mode.

7. The system according to claim 1, characterized in that: The infrared structured light projection consists of an infrared light source, a structured light projection sheet, and a lens. The wavelength of the infrared light source matches the wavelength of the infrared camera's filter; or The structured light projection sheet is etched with random codes.

8. The system according to claim 1, characterized in that: Each of the data acquisition units is serially connected via a CAN bus, and each data acquisition unit has a different CAN bus address.

9. The system according to claim 1, characterized in that: The data acquisition unit is rigidly installed at the channel opening with a closed structure, and the panel of the data acquisition unit is provided with a semi-permeable membrane.

Images