Scanner and operation method of scanner

Abstract

Disclosed in the present application are a scanner and an operation method of the scanner. The scanner comprises: a projection device, an image collection device and a main controller, wherein the main controller is connected to both the projection device and the image collection device; the main controller is configured to send a control signal so as to control the projection device and the image collection device; the projection device is configured to project a target pattern to the surface of a target object on the basis of a control signal sent by the main controller; the image collection device is configured to collect an image of the surface of the target object on the basis of the control signal sent by the main controller; and the projection device comprises a projection control module, a light source module and an imaging module. The present application solves the technical problem of the intensity of light sources projected by a projection device failing to meet ideal requirements, making it difficult for an image collection device to accurately recognize the content of images when capturing images of dark or even black objects, thereby affecting the scanning process.

Description

Scanners and how to operate them

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202311276465.5 and invention name “Scanner and Scanner Operating Method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of scanning technology, and in particular to a scanner and a method for operating the scanner. Background Art

[0003] Projection equipment is widely used in education, business presentations, entertainment, and home theaters. They offer larger image sizes, allowing viewers to better view and enjoy images and video content. However, in many projection scenarios, the projected light intensity doesn't meet ideal requirements. This makes it difficult for image capture devices to accurately identify dark or even black objects, hindering the proper scanning process.

[0004] To address the above-mentioned problems, no effective solutions have been proposed so far. Technical issues

[0005] The embodiments of the present application provide a scanner and a method for operating the scanner to at least solve the technical problem that the intensity of the light source projected by the projection device cannot meet the ideal requirements, resulting in the image acquisition device having difficulty in accurately identifying the content of the image when capturing images of dark or even black objects, thereby affecting the scanning work. Technical Solutions

[0006] According to one aspect of an embodiment of the present application, a scanner is provided, comprising: a projection device, an image acquisition device and a main controller, wherein the main controller is connected to the projection device and the image acquisition device, respectively, and the main controller is used to send control signals to control the projection device and the image acquisition device, the projection device is used to project a target pattern onto the surface of a target object according to the control signal sent by the main controller, and the image acquisition device is used to acquire an image of the surface of the target object according to the control signal sent by the main controller, and the projection device comprises a projection control module, a light source module and an imaging module, wherein the projection control module is connected to the light source module, the imaging module and the main controller, respectively, and is used to control the light source module and the imaging module according to the control signal sent by the main controller; the light source module is used to control multiple light sources in the light source module according to the control signal sent by the projection control module; and the imaging module is used to modulate the light projected by the light source module into a target pattern according to the control signal sent by the projection control module.

[0007] Optionally, the projection control module includes: a digital light processing controller, a digital light processing driver and a driving circuit, wherein the digital light processing controller is respectively connected to the digital light processing driver, the driving circuit and the main controller, and is used to control the digital light processing driver and the driving circuit according to the control signal sent by the main controller; the digital light processing driver is connected to a third light source among the multiple light sources, and is used to control the third light source according to the control signal sent by the digital light processing controller; and the driving circuit is connected to a first light source and a second light source among the multiple light sources, and is used to control the first light source according to the control signal sent by the digital light processing controller.

[0008] Optionally, the second light source among the multiple light sources is connected in series or in parallel with the first light source to the driving circuit; or, the second light source among the multiple light sources is connected in series or in parallel with the third light source to the digital light processing driver; or, two driving circuits are provided, and the two driving circuits are connected in parallel to one control interface, the first light source is connected to one driving circuit, and the second light source is connected to the other driving circuit.

[0009] Optionally, the digital light processing driver is connected to the third light source through two control interfaces and controls the third light source in combination, the driving circuit is connected to one of the control interfaces, and at least the control interface connected to the driving circuit among the two control interfaces outputs a high level when the first light source is in a working state.

[0010] Optionally, the driving circuit is connected to the main controller and is used to adjust the brightness of the light source connected to the driving circuit according to a pulse modulation signal sent by the main controller.

[0011] Optionally, the image acquisition device includes: a first camera, the first camera being used to acquire an image of the surface of the target object when the projection device projects the target pattern.

[0012] Optionally, the image acquisition device further includes: a second camera, the second camera being used to acquire an image of the surface of the target object when the projection device does not project the target pattern, and the second camera being used to acquire an image of the surface of the target object when the projection device projects the target pattern.

[0013] Optionally, the image acquisition device further includes: a fill light device, the fill light device is set corresponding to the camera, and the corresponding fill light device is triggered synchronously with the camera.

[0014] Optionally, the image acquisition device is connected to the projection control module and is used to acquire an image of the surface of the target object according to a trigger signal sent by the projection control module; and / or, the image acquisition device is connected to the main controller and is used to acquire an image of the surface of the target object according to a trigger signal sent by the main controller.

[0015] According to another aspect of an embodiment of the present application, a method for operating a scanner is also provided, which operates on the above-mentioned scanner, including: in response to an operation instruction of a target object, a projection control module obtains a control signal, a light source module emits light according to the control signal obtained by the projection control module, an imaging module modulates the light emitted by the light source module into a target pattern according to the control signal obtained by the projection control module, and projects the target pattern onto the surface of the target object; an image acquisition device obtains a trigger signal and acquires an image of the surface of the target object. Beneficial effects

[0016] In an embodiment of the present application, a projection device, an image acquisition device, and a main controller are used. The main controller is connected to the projection device and the image acquisition device, respectively. The main controller is used to send control signals to control the projection device and the image acquisition device. The projection device is used to project a target pattern onto the surface of a target object according to the control signal sent by the main controller, and the image acquisition device is used to acquire an image of the surface of the target object according to the control signal sent by the main controller. The projection device includes a projection control module, a light source module, and an imaging module. The projection control module is connected to the light source module, the imaging module, and the main controller, respectively, and is used to control the light source module and the imaging module according to the control signal sent by the main controller; the light source module is used to control multiple light sources in the light source module according to the control signal sent by the projection control module; and the imaging module is used to modulate the light projected by the light source module into a target pattern according to the control signal sent by the projection control module. Through the projection control module, the purpose of improving the brightness of the image captured by the image acquisition device is achieved, thereby achieving the technical effect of accurately identifying the image content, thereby solving the technical problem that the intensity of the light source projected by the projection device cannot meet the ideal requirements, resulting in the image acquisition device having difficulty in accurately identifying the content of the image when capturing images of dark or even black objects, thereby affecting the scanning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] FIG1 is a schematic structural diagram of a scanner according to an embodiment of the present application;

[0019] FIG2 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0020] FIG3 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0021] FIG4 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0022] FIG5 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0023] FIG6 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0024] FIG7 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0025] FIG8 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0026] FIG9 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0027] FIG10 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0028] FIG11 is a schematic structural diagram of another scanner according to an embodiment of the present application;

[0029] FIG12 is a flowchart of a method for operating a scanner according to an embodiment of the present application. Modes for Carrying Out the Invention

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] FIG1 is a schematic diagram of the structure of a scanner according to an embodiment of the present application. As shown in FIG1 , the scanner includes: a projection device 1, an image acquisition device 2 and a main controller 3, wherein:

[0033] The main controller 3 is connected to the projection device 1 and the image acquisition device 2 respectively. The main controller 3 is used to send control signals to control the projection device 1 and the image acquisition device 2. The projection device 1 is used to project a target pattern onto the surface of the target object according to the control signal sent by the main controller 3. The image acquisition device 2 is used to capture an image of the surface of the target object according to the control signal sent by the main controller 3. The projection device 1 includes a projection control module 10, a light source module 12 and an imaging module 14, wherein:

[0034] The projection control module 10 is connected to the light source module 12, the imaging module 14 and the main controller 3 respectively, and is used to control the light source module 12 and the imaging module 14 according to the control signal sent by the main controller 3;

[0035] The light source module 12 is used to control the multiple light sources in the light source module 12 according to the control signal sent by the projection control module 10;

[0036] The imaging module 14 is configured to modulate the light projected by the light source module 12 into a target pattern according to a control signal sent by the projection control module 10 .

[0037] According to some optional embodiments of the present application, the main controller 3 responds to the user's operating instructions and sends a control signal to the projection device 1 to control the projection device. At the same time, the main controller 3 also sends a control signal to the image acquisition device 2 based on the analyzed scanning signal information, so that it performs image acquisition according to the same scanning frequency and range. The projection device 1 and the image acquisition device 2 operate according to the commands sent by the main controller 3, thereby achieving synchronous operation. The projection device 1 projects according to the scanning signal, and the image acquisition device 2 captures the image at a time point synchronized with the projection device 1. The main controller 3 is also used to send a control signal to the projection control module 10 to control the light source in the projection device 1. The projection control module 10 generates a driving current based on the control signal, and then controls the light source in the projection device 1 based on the driving current.

[0038] Optionally, the main controller 3 includes but is not limited to: a microcontroller unit 3 (MCU) and a field-programmable gate array (FPGA), a central processing unit (CPU), a microprocessor unit (MPU), a system on a chip (SOC) and a complex programmable logic device (CPLD).

[0039] According to the above-mentioned scanner, through the projection control module 10, the purpose of improving the brightness of the image captured by the image acquisition device 2 is achieved, thereby achieving the technical effect of accurately identifying the image content.

[0040] FIG2 is a schematic diagram of the structure of another scanner according to an embodiment of the present application. As shown in FIG2 , the projection control module 10 includes: a digital light processing controller 1021, a digital light processing driver 1022 and a driving circuit 1023, wherein:

[0041] The digital light processing controller 1021 is connected to the digital light processing driver 1022, the driving circuit 1023 and the main controller 3 respectively, and is used to control the digital light processing driver 1022 and the driving circuit 1023 according to the control signal sent by the main controller 3. The digital light processing controller 1021 is also connected to the imaging module 14.

[0042] The digital light processing driver 1022 is connected to a third light source among the multiple light sources, and is configured to control the third light source according to a control signal sent by the digital light processing controller 1021 .

[0043] The driving circuit 1023 is connected to the first and second light sources of the multiple light sources and is used to control the first light source according to the control signal sent by the digital light processing controller 1021. According to other optional embodiments of the present application, the projection device 1 is preferably a digital light processing (DLP) projection device, and the digital light processing controller (DLPC) is a device for controlling digital light processing technology, wherein digital light processing technology is a technology that uses a micromirror array and a digital signal processor to generate and manipulate images, and is commonly used in devices such as projectors, monitors, and televisions. The DLPC is usually composed of a digital signal processor, an input / output interface, and a control circuit. The DLPC receives a digital signal from a source device (such as a computer, DVD player, etc.), performs image processing and optimization, and then sends the processed image signal to the micromirror array. The micromirror array is composed of many tiny controllable micromirrors, each of which can reflect or transmit light at different time points to generate an image. The control circuit of the DLPC is responsible for controlling the state of each micromirror in the micromirror array to achieve accurate image display.

[0044] Optionally, the digital light processing controller includes an input interface, a processing circuit, and an output interface. The input interface is used to process and convert digital signals, such as video or image data, and then transmit the processed signals to the digital light processing chip. The output interface converts the processed signals into control signals, which control the tilt angle of the micromirrors to switch pixels on and off and reflect light, thereby displaying images.

[0045] The DLP controller is used to drive a DMD (Digital Micromirror Device). A DMD is a digital display technology that uses micromirrors to control the tilt angle of the micromirrors, switching pixels on and off and reflecting light. The imaging module 14 is preferably a DMD.

[0046] The DLP driver receives control commands from the DLP controller and controls the on / off state of the light source based on the commands. For example, upon receiving a command to turn on the light source, the driver sends an electrical signal to the light source, causing it to begin emitting light. The DLP driver can also adjust the brightness of the light source based on the command, for example, by sending a corresponding electrical signal to control the light source to emit stronger or weaker light. Furthermore, the DLP driver can receive feedback signals from the light source. These signals can contain information about the light source's status or performance. The driver can then make corresponding adjustments or take other actions based on the feedback signals. In summary, the DLP driver controls and drives the light source by sending electrical signals, thereby controlling and operating the scanner's light source. This ensures that the light source operates as desired to produce high-quality scanned images.

[0047] A drive circuit is a circuit used to control and drive other electronic devices or circuits. The drive circuit can generate a corresponding voltage, current, or power output based on changes in the input signal, thereby controlling and driving other electronic devices. Optionally, the drive circuit consists of an amplifier circuit, a switching circuit, and a protection circuit. The amplifier circuit is used to amplify the amplitude of the input signal to achieve sufficient voltage, current, or power to drive the controlled device. The switching circuit is used to control the on / off state of the output signal based on changes in the input signal, thereby enabling start / stop control of the controlled device. The protection circuit is used to protect the drive circuit and the controlled device, preventing damage to the circuit due to abnormal conditions such as overcurrent and overvoltage.

[0048] The main function of a driver circuit is to control the load's operating state and performance based on changes in the input signal. Driver circuit characteristics include the following: 1. Current amplification: The driver circuit typically needs to amplify the input signal's current or voltage to provide sufficient power to the load for proper operation. 2. Power adaptability: The driver circuit must adapt to varying power supply voltages and frequencies. Therefore, the driver circuit must be able to adapt to varying power supply conditions to ensure stable load operation. 3. Response speed: The driver circuit's response speed determines the load's response time. Therefore, the driver circuit must exhibit fast response characteristics to ensure timely control of the load's state. 4. Protection: The driver circuit typically requires features such as overvoltage protection, overcurrent protection, and overtemperature protection to protect the load from damage. 5. Stability: The driver circuit must exhibit stable operating characteristics to ensure stable load operation. This includes features such as a stable power supply voltage and a stable output signal. 6. Efficiency: The driver circuit must exhibit high efficiency to maximize energy transfer to the load and minimize energy loss.

[0049] Optionally, driver circuit 1023 is a light-emitting diode (LED) switch driver circuit. An LED switch driver circuit is a circuit used to control the on / off state of an LED. An LED switch is typically used to turn an LED light on or off. The brightness and on / off state of the LED can be controlled by switching the circuit on and off. A common LED switch driver circuit uses a transistor to control the on / off state of the LED. This circuit uses an input signal to control the conduction and cutoff of a transistor. When the input signal is high, the transistor conducts, illuminating the LED; when the input signal is low, the transistor turns off, turning the LED off. Another common LED switch driver circuit uses an integrated circuit to control the on / off state of the LED. This circuit typically uses a digital signal input to control the output state of the integrated circuit, thereby controlling the on / off state of the LED. The integrated circuit can be programmed to control the brightness and on / off state of the LED, enabling more complex control functions. The LED switch driver circuit can also add other components, such as resistors and capacitors, as needed to achieve more precise control of the LED's brightness and on / off state. In summary, an LED switch driver circuit is a circuit used to control the on / off state of an LED. It can achieve LED on / off control using transistors or integrated circuits, and other components can be added as needed to achieve more precise control functions.

[0050] Optionally, the driving circuit 1023 and the digital light processing driver 1022 synchronously obtain the control signal sent by the main controller 3 to control the first light source, the second light source and the third light source to light up and turn off at the same time.

[0051] In some optional embodiments of the present application, a second light source among the plurality of light sources is connected in series or in parallel with the first light source to the driving circuit 1023. As shown in FIG2 , the second light source among the plurality of light sources is connected in parallel with the first light source to the driving circuit 1023. FIG3 is a schematic diagram of the structure of another scanner according to an embodiment of the present application. As shown in FIG3 , the second light source among the plurality of light sources is connected in series with the first light source to the driving circuit 1023.

[0052] FIG4 is a schematic structural diagram of another scanner according to an embodiment of the present application. As shown in FIG4 , the second light source and the third light source among the multiple light sources are connected in series or in parallel to the digital light processing driver 1022 .

[0053] Figure 5 is a structural schematic diagram of another scanner according to an embodiment of the present application. As shown in Figure 5, two driving circuits 1023 are provided, and the two driving circuits 1023 are connected in parallel to a control interface. The first light source is connected to one of the driving circuits 1023, and the second light source is connected to the other driving circuit 1023.

[0054] In summary, it should be noted that the wavelength bands of the first light source, the second light source and the third light source are different. In this embodiment, the first light source, the second light source and the third light source correspond to different visible lights respectively. Preferably, one corresponds to red light, another corresponds to green light, and another corresponds to blue light.

[0055] Figure 6 is a structural schematic diagram of another scanner according to an embodiment of the present application. As shown in Figure 6, the digital light processing driver 1022 is connected to the third light source through two control interfaces to control the third light source in combination. The driving circuit 1023 is connected to one of the control interfaces. At least the control interface connected to the driving circuit 1023 of the two control interfaces outputs a high level when the first light source is in working state.

[0056] It is understood that two control interfaces, such as LED_SEL_1 and LED_SEL_0, control the third light source in combination based on whether the control signal outputs a high or low level. If both control interfaces simultaneously output a low level, the digital light processing driver 1022 and the driver circuit 1023 cannot illuminate the light source. If the control interface LED_SEL_1 outputs a low level and the control interface LED_SEL_0 outputs a high level, the digital light processing driver 1022 receives a high level to illuminate the third light source, and the driver circuit 1023 connected to the control interface LED_SEL_0 also receives a high level to illuminate the light source connected to it. It should be noted that if both the control interface LED_SEL_1 and the control interface LED_SEL_0 output a high level, or if both the control interface LED_SEL_1 and the control interface LED_SEL_0 output a low level, the third light source cannot illuminate. The third light source can only be illuminated in accordance with one of the control states.

[0057] Figure 7 is a structural schematic diagram of another scanner according to an embodiment of the present application. As shown in Figure 7, the driving circuit 1023 is connected to the main controller 3 and is used to adjust the brightness of the light source connected to the driving circuit 1023 according to the pulse modulation signal sent by the main controller 3.

[0058] FIG8 is a schematic structural diagram of another scanner according to an embodiment of the present application. As shown in FIG8 , the image acquisition device 2 includes a first camera 20 , which is used to acquire an image of the surface of a target object when the projection device 1 projects a target pattern.

[0059] In other optional embodiments of the present application, the first camera 20 can be a black and white camera or a color camera. In a three-dimensional scanner, two first cameras 20 are generally provided to form a binocular camera, which synchronously captures images of the surface of the target object for binocular stereo matching reconstruction to obtain a three-dimensional digital model of the surface of the target object.

[0060] Figure 9 is a structural schematic diagram of another scanner according to an embodiment of the present application. As shown in Figure 9, the image acquisition device 2 also includes: a second camera 22, the second camera 22 is used to capture the image of the surface of the target object when the projection device 1 does not project the target pattern, and the second camera 22 is used to capture the image of the surface of the target object when the projection device 1 projects the target pattern.

[0061] Exemplarily, the second camera 22 is a color camera for reconstructing the texture of the surface of the target object. When the first camera 20 is a color camera, the second camera 22 and the first camera 20 may be the same camera.

[0062] Figure 10 is a structural diagram of another scanner according to an embodiment of the present application. As shown in Figure 10, the image acquisition device 2 also includes: a fill light device 24, the fill light device 24 is set corresponding to the camera, and the corresponding fill light device 24 is triggered synchronously with the camera.

[0063] Preferably, the first camera 20 is triggered synchronously with its corresponding fill light, and the second camera 22 is triggered synchronously with its corresponding fill light, and the acquisition frame rate of the second camera 22 is lower than that of the first camera 20; the first camera 20, the imaging module 14 and the light source module 12 work synchronously, and the acquisition frame rate of the first camera 20 is the same as the operating frequency of the imaging module 14; when the second camera 22 is triggered, the light source module 12 stops working (i.e., no light is projected).

[0064] Figure 11 is a structural schematic diagram of another scanner according to an embodiment of the present application. As shown in Figure 11, the image acquisition device 2 is connected to the projection control module 10 and is used to acquire the image of the surface of the target object according to the trigger signal sent by the projection control module 10; and / or, the image acquisition device 2 is connected to the main controller 3 and is used to acquire the image of the surface of the target object according to the trigger signal sent by the main controller 3.

[0065] Preferably, the first camera 20, the second camera 22 and the fill light device 24 are all connected to the projection control module 10, and are used to capture the image of the surface of the target object according to the trigger signal sent by the projection control module 10; and / or, they are all connected to the main controller 3, and are used to capture the image of the surface of the target object according to the trigger signal sent by the main controller 3.

[0066] FIG12 is a flowchart of a method for operating a scanner according to an embodiment of the present application. The method is applied to any one of the scanners in FIG1-11 above. The method includes:

[0067] In step S1202, in response to the operation instruction of the target object, the projection control module obtains a control signal, the light source module emits light according to the control signal obtained by the projection control module, and the imaging module modulates the light emitted by the light source module into a target pattern according to the control signal obtained by the projection control module, and projects the target pattern onto the surface of the target object.

[0068] Step S1204: The image acquisition device obtains a trigger signal and acquires an image of the surface of the target object.

[0069] Specifically, in response to an operation instruction of the target object, the main controller sends a control signal to the projection control module and simultaneously sends a trigger signal to the image acquisition device.

[0070] Optionally, in response to an operation instruction of the target object, the main controller sends a control signal to the projection control module, and the projection control module sends a trigger signal to the image acquisition device in response to the control signal.

[0071] Optionally, when the second light source among the multiple light sources is connected in series or in parallel with the first light source to the drive circuit, and the third light source is connected to the digital light processing driver, the digital light processing controller in the projection control module receives the first control signal sent by the main controller to control the digital light processing driver and the drive circuit. The digital light processing driver controls the third light source to turn on, and at the same time, the drive circuit controls the first and second light sources to turn on synchronously with the third light source, thereby achieving synchronous control to illuminate the first, second, and third light sources to project the desired light. It is understood that the brightness of the first and second light sources can be controlled by adjusting the drive current of the drive circuit, and the brightness of the third light source can be controlled by the digital light processing controller.

[0072] Optionally, when the second and third light sources among the multiple light sources are connected in series or in parallel to a digital light processing driver, and the first light source is connected to a drive circuit, the digital light processing controller in the projection control module receives a first control signal sent by the main controller to control the digital light processing driver and the drive circuit. The digital light processing driver controls the second and third light sources to turn on, while the drive circuit controls the first light source to turn on synchronously with the second and third light sources, thereby achieving synchronous control of lighting the first, second, and third light sources to project the desired light. It will be understood that the brightness of the first light source can be controlled by adjusting the drive current of the drive circuit, and the brightness of the second and third light sources can be controlled by the digital light processing controller.

[0073] Optionally, in a case where two drive circuits are provided, the two drive circuits are connected in parallel to a control interface, the first light source is connected to one of the drive circuits, the second light source is connected to the other drive circuit, and the third light source is connected to a digital light processing driver, the digital light processing controller in the projection control module receives a first control signal sent by the main controller to control the digital light processing driver and the drive circuit. The digital light processing driver controls the activation of the third light source. Simultaneously, the two drive circuits respectively control the first and second light sources, activating them synchronously with the third light source, similarly achieving synchronous control of illuminating the first, second, and third light sources to project the desired light. It is understood that the brightness of the first and second light sources can be controlled by adjusting the drive currents of the two drive circuits, respectively, and the brightness of the third light source can be controlled by the digital light processing controller.

[0074] For example, the method for adjusting the driving current of the driving circuit is: connecting the main controller and the driving circuit, adjusting the driving current of the driving circuit by adjusting the pulse modulation signal sent by the main controller, and then adjusting the brightness of the light source connected to the driving circuit. Specifically, the main controller sends a pulse signal of a specific frequency to the driving circuit. After the driving circuit receives the signal, it controls the output current according to the high and low levels of the signal. Among them, the high level of the pulse signal represents the maximum current output, and the low level represents the minimum current output. By adjusting the duty cycle of the pulse signal (the ratio of the high level time to the period), the output current of the driving circuit can be adjusted. It is understandable that the larger the duty cycle, the longer the high level time, the larger the output current, and the higher the brightness of the light source. Conversely, the smaller the duty cycle, the smaller the output current, and the lower the brightness of the light source.

[0075] According to some optional embodiments of the present application, the main controller responds to the user's operating instructions and sends a first control signal to the projection control module to control the projection device. At the same time, the main controller will also send a second control signal to the image acquisition device based on the parsed scanning signal information, so that it can perform image acquisition according to the same scanning frequency and range. The projection device and the image acquisition device operate according to the commands sent by the main controller, thereby achieving synchronous operation. The projection device projects according to the scanning signal, and the image acquisition device captures the image at a time point synchronized with the projection device. The main controller is also used to send a control signal to the projection control module to control the light source in the projection device. The projection control module generates a driving current based on the control signal, and then controls the light source in the projection device based on the driving current.

[0076] Optionally, the digital light processing driver is connected to a third light source via two control interfaces, thereby controlling the third light source in combination. The driver circuit is connected to one of the control interfaces, and at least the control interface connected to the driver circuit outputs a high level when the first light source is in operation. Specifically, the two control interfaces, for example, LED_SEL_1 and LED_SEL_0, output a high level or a low level based on control signals, thereby controlling the third light source in combination. If both control interfaces simultaneously output a low level, the digital light processing driver and the driver circuit cannot drive the light source to illuminate. If the control interface LED_SEL_1 outputs a low level and the control interface LED_SEL_0 outputs a high level, the digital light processing driver obtains a high level, thereby driving the third light source to illuminate. The driver circuit connected to the control interface LED_SEL_0 also obtains a high level, thereby driving the light source connected thereto to illuminate.

[0077] Optionally, when the image acquisition device includes: a first camera, a second camera, and a fill light device, for example, the fill light device includes: a first fill light device corresponding to the first camera, and a second fill light device corresponding to the second camera. The first camera is triggered synchronously with the first fill light device, that is, when the projection device projects the target pattern, the first camera captures an image of the target object surface, and the first fill light device synchronously provides fill light for the first camera; the second camera is triggered synchronously with the second fill light device, that is, when the projection device does not project the target pattern, the second camera captures an image of the target object surface, and the second fill light device provides fill light for the second camera, or, when the projection device projects the target pattern, the second camera captures an image of the target object surface, and the second fill light device provides fill light for the second camera. Preferably, the acquisition frame rate of the second camera is lower than the acquisition frame rate of the first camera.

[0078] The operation method of the scanner is specifically described in conjunction with a scanner shown in Figure 10. The main controller 3 responds to the user's scanning instruction to send a control signal to the projection device 1 and synchronously sends a trigger signal to the image acquisition device 2. The projection device 1 receives the control signal and projects a target pattern onto the surface of the target object according to the control signal. The image acquisition device 2 receives the trigger signal and captures an image of the surface of the target object according to the trigger signal.

[0079] The projection device 1 projects a periodic rectangular wave signal, and projects a target pattern and a black pattern alternately, generally continuously projecting N frames of target pattern and 1 frame of black pattern. It can be understood that the projection of the black pattern is a periodic rectangular wave.

[0080] For image acquisition device 2, the first camera 20 and its corresponding fill light are turned on and off synchronously with projection device 1, that is, they are triggered by the same periodic rectangular wave signal as projection device 1. The image captured by the first camera 20 during black pattern projection is not used. The second camera and its corresponding fill light are triggered by the same periodic rectangular wave signal as the black pattern projection.

[0081] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0082] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0084] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of the present embodiment according to actual needs.

[0085] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0086] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the relevant technology, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0087] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A scanner, characterized in that: include: A projection device, an image acquisition device and a main controller, wherein the main controller is connected to the projection device and the image acquisition device respectively, and the main controller is used to send a control signal to control the projection device and the image acquisition device. The projection device is used to project a target pattern onto the surface of a target object according to the control signal sent by the main controller, and the image acquisition device is used to acquire an image of the surface of the target object according to the control signal sent by the main controller. The projection device includes a projection control module, a light source module and an imaging module, wherein: The projection control module is connected to the light source module, the imaging module and the main controller respectively, and is used to control the light source module and the imaging module according to the control signal sent by the main controller; The light source module is used to control multiple light sources in the light source module according to the control signal sent by the projection control module; The imaging module is used to modulate the light projected by the light source module into a target pattern according to a control signal sent by the projection control module.

2. The scanner according to claim 1, characterized in that The projection control module includes: a digital light processing controller, a digital light processing driver and a driving circuit, wherein: The digital light processing controller is connected to the digital light processing driver, the driving circuit and the main controller respectively, and is used to control the digital light processing driver and the driving circuit according to the control signal sent by the main controller; The digital light processing driver is connected to a third light source among the multiple light sources, and is used to control the third light source according to a control signal sent by the digital light processing controller; The driving circuit is connected to a first light source and a second light source among the plurality of light sources, and is used to control the first light source according to a control signal sent by the digital light processing controller.

3. The scanner according to claim 2, characterized in that: The second light source among the plurality of light sources is connected in series or in parallel with the first light source to the driving circuit; or, The second light source and the third light source among the plurality of light sources are connected in series or in parallel to the digital light processing driver; or, There are two drive circuits, which are connected in parallel to a control interface. The first light source is connected to one of the drive circuits, and the second light source is connected to the other drive circuit.

4. The scanner according to any one of claims 1 to 3, characterized in that: The digital light processing driver is connected to the third light source through two control interfaces to control the third light source in combination, the driving circuit is connected to one of the control interfaces, and at least the control interface connected to the driving circuit among the two control interfaces outputs a high level when the first light source is in working state.

5. The scanner according to claim 2 or 3, characterized in that: The driving circuit is connected to the main controller and is used to adjust the brightness of the light source connected to the driving circuit according to the pulse modulation signal sent by the main controller.

6. The scanner according to claim 1, characterized in that: The image acquisition device comprises: a first camera, wherein the first camera is used to acquire an image of a surface of a target object when the projection device projects a target pattern.

7. The scanner according to claim 5, characterized in that: The image acquisition device also includes: a second camera, the second camera is used to acquire an image of the surface of the target object when the projection device does not project the target pattern, and the second camera is used to acquire an image of the surface of the target object when the projection device projects the target pattern.

8. The scanner according to claim 6 or 7, characterized in that: The image acquisition device further includes: a fill light device, the fill light device is arranged correspondingly to the camera, and the corresponding fill light device is triggered synchronously with the camera.

9. The scanner according to claim 8, characterized in that: The image acquisition device is connected to the projection control module and is used to acquire the image of the surface of the target object according to the trigger signal sent by the projection control module; and / or, the image acquisition device is connected to the main controller and is used to acquire the image of the surface of the target object according to the trigger signal sent by the main controller.

10. A method for operating a scanner, characterized in that: The operating method is applied to the scanner according to any one of claims 1 to 9, wherein the operating method comprises: In response to an operation instruction of a target object, the projection control module acquires a control signal, the light source module emits light according to the control signal acquired by the projection control module, and the imaging module modulates the light emitted by the light source module into a target pattern according to the control signal acquired by the projection control module, and projects the target pattern onto the surface of the target object; The image acquisition device obtains a trigger signal and acquires an image of the surface of the target object.

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