Light source system of endoscope and endoscope

Abstract

The light source system comprises a light source module and a second processing module, the second processing module is in signal connection with a first processing module in a camera shooting system of the endoscope, and the second processing module obtains a vertical synchronous clock signal used for controlling exposure of an image sensor from the first processing module. The method comprises the steps of receiving a vertical synchronous clock signal, generating a PWM control signal according to the vertical synchronous clock signal, and outputting the PWM control signal to a light source module to control the light source module to flicker and illuminate at the frequency of the PWM control signal, and because the PWM control signal and the vertical synchronous clock signal at least have the same frequency, the flicker frequency of the light source module for illumination is the same as the frequency of the vertical synchronous clock signal. The flicker frequency of the light source module for illumination is the same as the exposure frequency of the image sensor, so that the flicker illumination is adopted, a large amount of heat generated by long-time work of a direct-current power supply adopted by the light source is avoided, and better illumination can be carried out in the exposure process of the image sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, and in particular to a light source system of an endoscope and an endoscope. Background Art

[0002] An endoscope is a medical electronic optical instrument that can be inserted into the human body cavity or organs for direct observation, diagnosis, and treatment. It uses an optical lens to optically image the target object to be observed through a lens group, and then transmits the optical image to the camera system for image processing. Finally, the observed image after image processing is output on the display screen for the doctor to observe and diagnose.

[0003] The light source of an endoscope is mostly a cold light source, which is used to provide sufficient lighting to clearly observe the details of tissues and organs in the body during endoscopic examination or surgery. It usually needs to be used in conjunction with the endoscope's camera system, optical lens and monitor.

[0004] At present, the cold light source of mainstream endoscopes uses a DC power supply. The luminous flux output of the cold light source remains constant. Long-term operation will generate a lot of heat, which will increase the temperature of the cold light source host, the light guide and the light source endoscope bayonet, which may burn the doctors and nurses who use it and affect the normal operation. In addition, during the high luminous flux output process, the temperature is relatively high under long-term direct exposure, which may burn the tissue and cause harm to the patient. In order to solve the above problems, the cold light source of some endoscopes is driven by a high-frequency power supply, so that the luminous flux of the cold light source is intermittent, that is, flashing lighting, which reduces the heat generation. However, since the exposure frequency of the image sensor of the camera system and the flashing frequency of the cold light source are relatively independently set, the two frequencies are not synchronized. When the image sensor captures the moment when the cold light source flashes, some areas may be overexposed or underexposed, resulting in obvious stripes in the observed image. Summary of the invention

[0005] In view of the above problems, the present application provides an endoscope light source system and an endoscope, which are described in detail below.

[0006] According to a first aspect, an embodiment provides a light source system of an endoscope, the endoscope comprising a camera system, the camera system comprising a camera, an image sensor disposed in the camera, and a first processing module connected to the camera, the first processing module is used to generate a vertical synchronization clock signal and output it to the image sensor, so that the image sensor is exposed under the control of the vertical synchronization clock signal, wherein the light source system comprises:

[0007] A light source module, connected to the camera, and used to provide lighting when the image sensor captures an image;

[0008] A second processing module is respectively connected to the light source module and the first processing module signal, the second processing module is used to obtain the vertical synchronization clock signal from the first processing module, and generate a PWM control signal according to the vertical synchronization clock signal, and output the PWM control signal to the light source module; wherein the PWM control signal and the vertical synchronization clock signal have at least the same frequency, and the PWM control signal is used to control the light source module to flash at the frequency of the PWM control signal.

[0009] In one embodiment, the PWM control signal and the vertical synchronization clock signal also have the same phase.

[0010] In one embodiment, the first processing module has a first vertical synchronization interface, the second processing module has a second vertical synchronization interface, and the first vertical synchronization interface and the second vertical synchronization interface are connected via a vertical synchronization signal line.

[0011] In one embodiment, the PWM control signal and the vertical synchronization clock signal also have the same pulse width.

[0012] In one embodiment, the second processing module is further used to obtain an exposure value of the image sensor from the first processing module, and determine a target pulse width according to the exposure value, wherein the target pulse width is a pulse width of the vertical synchronization clock signal;

[0013] Generating a PWM control signal according to the vertical synchronization clock signal comprises:

[0014] A PWM control signal having the target pulse width is generated according to the vertical synchronization clock signal and the target pulse width.

[0015] In one embodiment, the first processing module is further used to obtain the current frame image data output by the image sensor; according to the current frame image data, at least determine the brightness control signal of the light source module, and output the brightness control signal to the second processing module;

[0016] The second processing module is further configured to obtain the brightness control signal from the first processing module, and output the brightness control signal to the light source module to adjust the instantaneous brightness of the light source module.

[0017] In one embodiment, it also includes:

[0018] The digital-to-analog conversion module is connected between the second processing module and the light source module, and is used to convert the brightness control signal into an analog DC voltage and then output it to the light source module to control the instantaneous brightness of the light source module.

[0019] In one embodiment, the first processing module has a first communication interface, the second processing module has a second communication interface, and the first communication interface and the second communication interface are communicatively connected.

[0020] In one embodiment, both the first processing module and the second processing module are field programmable gate array controllers.

[0021] According to a second aspect, an endoscope is provided in one embodiment, comprising:

[0022] A camera system, comprising a camera, an image sensor disposed in the camera, and a first processing module connected to the camera, wherein the first processing module is used to generate a vertical synchronization clock signal and output it to the image sensor, so that the image sensor is exposed under the control of the vertical synchronization clock signal; and

[0023] The light source system as described in any of the above embodiments is connected to the camera.

[0024] According to the light source system and endoscope of the endoscope in the above-mentioned embodiment, the light source system includes a light source module and a second processing module, the second processing module is signal-connected to the first processing module in the camera system of the endoscope, the second processing module obtains the vertical synchronization clock signal for controlling the exposure of the image sensor from the first processing module, and generates a PWM control signal according to the vertical synchronization clock signal, and outputs the PWM control signal to the light source module to control the light source module to perform flashing illumination at the frequency of the PWM control signal. Since the PWM control signal and the vertical synchronization clock signal have at least the same frequency, the flashing frequency of the illumination performed by the light source module is the same frequency as the vertical synchronization clock signal, that is, the flashing frequency of the illumination performed by the light source module is the same frequency as the exposure of the image sensor. Therefore, the present invention adopts flashing illumination to avoid the large amount of heat generated by the light source using a DC power supply for a long time, and can also perform better illumination during the exposure process of the image sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of an endoscope according to an embodiment;

[0026] Figure 2 A schematic structural diagram of an endoscope camera system according to an embodiment;

[0027] Figure 3 It is a structural schematic diagram of a light source system of an endoscope according to another embodiment;

[0028] Figure 4 A schematic diagram of the connection between the second processing module and the first processing module in one embodiment;

[0029] Figure 5 A schematic diagram of the clock signal for high-frequency flashing of the light source module and exposure of the image sensor;

[0030] Figure 6 A schematic diagram of image acquisition by an image sensor according to an embodiment;

[0031] Figure 7 A schematic diagram of the connection between the second processing module and the first processing module in one embodiment;

[0032] Figure 8 It is a schematic diagram of synchronization between the exposure frequency of the image sensor and the flashing frequency of the light source module;

[0033] Fig. 9 A schematic diagram of the connection between the second processing module and the first processing module in one embodiment;

[0034] Fig.10 A schematic diagram of synchronization between the exposure frequency of the image sensor and the flashing frequency and phase of the light source module;

[0035] Fig.11 A schematic diagram of the connection between the second processing module and the first processing module in one embodiment;

[0036] Fig.12 A schematic diagram showing the synchronization of the exposure frequency of the image sensor with the flashing frequency, phase and pulse width of the light source module;

[0037] Fig.13 This is a schematic diagram showing that the light source module and the image sensor have the same exposure frequency, phase, and pulse width, and can achieve automatic adjustment of transient light intensity. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0039] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0040] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0041] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an endoscope according to an embodiment. The endoscope at least includes a camera system 100 for acquiring images and a light source system 200 for providing illumination when acquiring images. In addition to transmitting illumination light, signal transmission can also be performed between the light source system 200 and the camera system 100.

[0042] Please refer to Figure 2 In some embodiments, the endoscope camera system includes at least a camera head 101 and a first processing module 102, and the camera head 101 and the first processing module 102 transmit signals via a transmission cable.

[0043] In some embodiments, the camera 101 includes at least an optical lens 301, an optical prism 302 and an image sensor 303; the first processing module 102 is a field programmable gate array controller (FPGA). This embodiment uses FPGA, which has the advantages of fast processing speed and high integration.

[0044] The optical lens 301 is an optical path system composed of multiple optical lenses. The white light generated by the light source module 207 will form return light after being emitted to the target object. The above optical path system also provides an optical path for the return light, which can guide the return light to the optical prism 302. The optical prism 302 outputs the return light to the light field range of the image sensor 303 for collecting light signals. The image sensor 303 is used to collect light signals and convert the light signals into image pixel data. The image sensor 303 sends the image pixel data to the first processing module 102.

[0045] The first processing module 102 is used to generate and output a vertical synchronization clock signal (VSYNC) to the image sensor 303, so that the image sensor 303 is exposed under the control of the vertical synchronization clock signal (VSYNC) to collect light signals. The duration of each exposure of the image sensor 303 is determined by the exposure value sent by the first processing module 102 through the IIC. In addition, the first processing module 102 is also used to receive the image pixel data (RAW) sent by the image sensor 303 to perform relevant processing on the image pixel data.

[0046] Please refer to Figure 3 , Figure 3 This is a structural schematic diagram of a light source system of an embodiment, wherein the light source system includes a power module 201, a second processing module 202, an SD module 203, an EMMC module 204, a DDR module 205, an LCD module 206, a communication module 207 and an LED module 207, wherein the power module 201, the SD module 203, the EMMC module 204, the DDR module 205, the LCD module 206, the communication module and the light source module 207 are all connected to the second processing module 202, and the power module 201 is connected to all modules. The functions of each module are described below.

[0047] The power module 201 provides power delivery to all modules of the light source system.

[0048] The second processing module 202 is used to receive the control signal and vertical synchronization clock signal of the endoscope's camera system, and control the light source brightness output. In one embodiment, the second processing module 202 is a field programmable gate array controller (FPGA). This embodiment uses FPGA, which has the advantages of fast processing speed and high integration, and interacts with the first processing module 102 which also uses FPGA, and has the advantage of good interface compatibility.

[0049] The SD module 203 is used for program storage and system booting, and includes an SDIO interface and an SD memory card. The second processing module 202 also has an SDIO interface. The server management control card (SOC) of the second processing module 202 is connected to the SDIO interface of the SD module through its SDIO interface, and program storage and system booting are achieved by reading and writing the SD memory card.

[0050] The EMMC module 204 is used for program storage and system booting, and includes an SDIO interface and a KLM8G1WEPD storage chip. The server management control card (SOC) of the second processing module 202 is connected to the EMMC module 204 via its SDIO interface, and program storage and system booting are achieved by reading and writing the EMMC module 204.

[0051] The DDR module 205 is used for temporary image storage, and includes a DDR interface and a K4A4G085WD storage chip. The server management control card (SOC) of the second processing module 202 is connected to the DDR module 205 via the DDR interface.

[0052] The LCD module 206 is used for the human-computer interaction interface of the light source system. The second processing module 202 and the LCD module 206 communicate using a UART serial port. The user can switch the light source mode, turn the light source on or off, adjust the light source brightness, and other functions by touching the LCD buttons.

[0053] The communication module 207 is used for communication between the endoscope's camera system and the light source system, using an RS485 interface and a vertical synchronization signal line (VSYNC). RS485 is used to transmit control signals, such as pulse width information, light source brightness information, etc. The vertical synchronization signal line is used to synchronize the flashing frequency of the light source with the frame rate of the image sensor of the endoscope camera system.

[0054] The light source module 207 is arranged on the camera 101 of the camera system 100, and is used to provide white light illumination. It can be an LED module, including an LED driver chip and LED lamp beads. The second processing module 202 controls the light intensity and flickering of the LED lamp beads through the DAC interface and the PWM interface, and reads the chassis temperature through the ADC interface to feed back to the second processing module 202.

[0055] The communication module is used for communication between the endoscope's camera system 100 and the light source system 200, and includes a communication interface (RS485) and a vertical synchronization interface (GPIO interface). RS485 is used to transmit control signals, such as pulse width information, brightness control signals of the light source module 207, etc. The vertical synchronization interface is used to achieve phase and frequency synchronization between the light source module 207 and the image sensor of the endoscope's camera system.

[0056] In the prior art, please refer to Figure 4 If the second processing module 202 is not signal-connected to the first processing module 102, the second processing module 202 outputs a high-frequency (e.g., 16666HZ) PWM control signal to the light source module 207 to control the light source module 207 to flash at a high frequency. Figure 5 As shown in FIG. 1 , the exposure frequency of the image sensor 303 of the camera system 100 and the flickering frequency of the light source module 207 are relatively independently set, so that the two frequencies are not synchronized, when the image sensor 303 captures the moment when the light source module 207 flickers, some areas may be overexposed or underexposed, such as Figure 6 As shown, obvious stripes are formed in the observed image.

[0057] In the embodiment of the present invention, please refer to Figure 7, the second processing module 202 is connected to the first processing module 102 by signal. In one embodiment, the first processing module 102 has a first communication interface, the second processing module 202 has a second communication interface, and the first communication interface and the second communication interface are connected via serial communication (such as RS485); in another embodiment, the first processing module 102 has a first vertical synchronization interface, the second processing module 202 has a second vertical synchronization interface, and the first vertical synchronization interface and the second vertical synchronization interface are connected by signal. In any of the above-mentioned signal connection modes between the second processing module 202 and the first processing module 102, the first processing module 102 sends a vertical synchronization clock signal to the second processing module 202.

[0058] The second processing module 202 obtains the vertical synchronization clock signal from the first processing module, generates a PWM control signal according to the vertical synchronization clock signal, and outputs the PWM control signal to the light source module 207. The PWM control signal and the vertical synchronization clock signal have at least the same frequency. The PWM control signal is used to control the light source module 207 to flash at the frequency of the PWM control signal. In one embodiment, the second processing module 202 obtains a frequency F1 according to the vertical synchronization clock signal, and outputs a PWM control signal of the frequency F1. Please refer to Figure 8 , the exposure frequency of the image sensor 303 is synchronized with the flickering frequency of the light source module 207, that is, they have the same period T1, so that the light source module 207 is on when the image sensor 303 is exposed, and off when the image sensor 303 is not exposed. Of course, in some cases, the light source module 207 is off when the image sensor 303 is exposed, and is on when the image sensor 303 is not exposed. Although this situation will reduce the brightness of the observation image, it can still avoid capturing the problem of obvious stripes in the observation image caused by flickering.

[0059] Therefore, the light source module 207 of the light source system 200 flashes at the frequency of the PWM control signal, and there is no need to use a DC power supply for continuous lighting. A large amount of heat will not be generated during long-term operation. In addition, the light source module 207 is controlled by the PWM control signal to flash at the same frequency as the exposure frequency of the image sensor 303 to achieve better lighting.

[0060] In the case of consistent frequency, as mentioned above, when the on time of the light source module 207 output is inconsistent with the exposure time of the image sensor 303, it may happen that when the image sensor 303 starts to expose, the light source block 207 is not turned on and cannot provide lighting for exposure, resulting in reduced brightness of the observed image.

[0061] In some embodiments, in order to solve the above problems, phase synchronization is further added on the basis of the above embodiments. Fig. 9 , the second processing module 202 is connected to the first processing module 102 through the first vertical synchronization interface and the second vertical synchronization interface to transmit the vertical synchronization clock signal (VSYNC). The second processing module 202 obtains the vertical synchronization clock signal from the first processing module, generates a PWM control signal according to the vertical synchronization clock signal, and outputs the PWM control signal to the light source module 207. The PWM control signal has the same frequency and phase as the vertical synchronization clock signal. In one embodiment, the second processing module 202 obtains the frequency F1 and the phase φ1 according to the vertical synchronization clock signal, and outputs the PWM control signal of the frequency F1 and the phase φ1. Please refer to Fig.10 The PWM control signal has the same frequency and phase as the vertical synchronization clock signal, that is, the light source module 207 is frequency-synchronized and phase-synchronized with the vertical synchronization clock signal, that is, the same frequency and phase as the exposure (Sensor expose) of the image sensor 303.

[0062] When both the frequency and phase are synchronized, the shut-off time of the brightness output of the light source module 207 is inconsistent with the sleep time of the image sensor 303. It is possible that the light source module 207 is turned off while the image sensor 303 is still maintaining exposure, causing the lower half of the captured image to be black. Alternatively, the image sensor 303 is already in sleep mode while the light source module 207 is still outputting brightness, resulting in a waste of light source.

[0063] In some embodiments, in order to solve the above problems, pulse width synchronization is further added on the basis of the above embodiments. Fig.11 The second processing module 202 is connected to the first processing module 102 through the first vertical synchronization interface and the second vertical synchronization interface to transmit the vertical synchronization clock signal (VSYNC). In addition, the second processing module 202 is also connected to the first processing module 102 through the first communication interface and the second communication interface to transmit the exposure value of the image sensor 303.

[0064] The second processing module 202 obtains the exposure value of the image sensor 303 from the first processing module 102, and determines the first pulse width according to the exposure value.

[0065] The second processing module 202 generates a PWM control signal according to the vertical synchronization clock signal, including:

[0066] According to the vertical synchronization clock signal and the first pulse width, a PWM control signal having the first pulse width, a frequency F1 and a phase φ1 is generated. The PWM control signal has the same frequency and phase as the vertical synchronization clock signal.

[0067] Please refer to Fig.12The PWM control signal has the same frequency and phase as the vertical synchronization clock signal, and the PWM control signal has an exposure value corresponding to the image sensor 303, that is, the exposure (Sensor expose) of the light source module 207 and the image sensor 303 has the same frequency, phase and pulse width.

[0068] Since the transient light intensity of the light source module 207 cannot be automatically adjusted, a narrow cavity requires low brightness, and a spacious cavity requires high brightness. The doctor or nurse needs to manually adjust the transient light intensity according to the actual surgical scene, which is not conducive to the normal progress of the operation. Too high brightness will increase the risk of thermal damage, and too low brightness will reduce the image quality.

[0069] In some embodiments, in order to solve the above problem, on the basis of the above embodiment, an automatic dimming function of the light source module 207 is further added. The connection method of the second processing module 202 and the first processing module 102 is the same as Fig.11 The second processing module 202 is connected to the first processing module 102 through the first vertical synchronization interface and the second vertical synchronization interface to transmit the vertical synchronization clock signal (VSYNC). In addition, the second processing module 202 is also connected to the first processing module 102 through the first communication interface and the second communication interface to transmit the exposure value and brightness control signal of the image sensor 303.

[0070] The first processing module 102 obtains the current frame image data output by the image sensor 303; based on the current frame image data, the automatic light metering algorithm is used to determine the brightness control signal of the light source module 207, the image processing gain value of the image sensor 303 and the exposure value of the image sensor 303, and the brightness control signal is output to the second communication interface of the second processing module 202 through the first communication interface.

[0071] The second processing module 202 obtains a brightness control signal from the first processing module 102, and converts the brightness control signal into an analog DC voltage through a digital-to-analog conversion module (DAC) connected between the second processing module 202 and the light source module 207, and then outputs the analog DC voltage to the light source module 207 to control the instantaneous brightness of the light source module 207, thereby realizing automatic adjustment of the instantaneous brightness.

[0072] Please refer to Fig.13 The PWM control signal has the same frequency and phase as the vertical synchronization clock signal, and the PWM control signal has an exposure value corresponding to the image sensor 303, that is, the exposure (Sensor expose) of the light source module 207 and the image sensor 303 has the same frequency, phase, and pulse width, and can realize automatic adjustment of transient light intensity.

[0073] This document is described with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope of this document. For example, various operating steps and components for performing the operating steps may be implemented in different ways (e.g., one or more steps may be deleted, modified, or incorporated into other steps) depending on the specific application or considering any number of cost functions associated with the operation of the system.

[0074] In addition, as will be appreciated by those skilled in the art, the principles of the present invention may be reflected in a computer program product on a computer-readable storage medium, which is pre-installed with a computer-readable program code. Any tangible, non-temporary computer-readable storage medium may be used, including magnetic storage devices (hard disks, floppy disks, etc.), optical storage devices (CD-ROMs, DVDs, Blu Ray disks, etc.), flash memory, and / or the like. These computer program instructions may be loaded onto a general-purpose computer, a special-purpose computer, or other programmable data processing device to form a machine, so that these instructions executed on a computer or other programmable data processing device may generate a device that implements a specified function. These computer program instructions may also be stored in a computer-readable memory, which may instruct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory may form a manufactured product, including an implementation device that implements a specified function. The computer program instructions may also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device may provide steps for implementing a specified function.

[0075] Although the principles of this invention have been shown in various embodiments, many modifications of structures, arrangements, proportions, elements, materials and components particularly suitable for specific environments and operational requirements can be used without departing from the principles and scope of this invention. The above modifications and other changes or amendments will be included in the scope of this invention.

[0076] The foregoing specific description has been described with reference to various embodiments. However, those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of the present disclosure. Therefore, the consideration of the present disclosure will be illustrative rather than restrictive, and all these modifications will be included in its scope. Similarly, the advantages, other advantages and solutions to the problems of various embodiments have been described above. However, the benefits, advantages, solutions to the problems and any elements that can produce these, or make them more clear, should not be interpreted as critical, necessary or necessary. The term "include" and any other variants used in this article are all non-exclusive inclusions, so that the process, method, article or device including the list of elements not only includes these elements, but also includes other elements that are not explicitly listed or do not belong to the process, method, system, article or device. In addition, the term "coupled" and any other variants used in this article refer to physical connections, electrical connections, magnetic connections, optical connections, communication connections, functional connections and / or any other connections.

[0077] Those skilled in the art will appreciate that many changes may be made to the details of the above-described embodiments without departing from the basic principles of the invention. Therefore, the scope of the invention should be determined from the following claims.

Claims

1. A light source system for an endoscope, the endoscope comprising a camera system, the camera system comprising a camera head, an image sensor disposed in the camera head, and a first processing module connected to the camera head, the first processing module being used to generate a vertical synchronization clock signal and output it to the image sensor, so that the image sensor is exposed under the control of the vertical synchronization clock signal, characterized in that: The light source system comprises: A light source module, connected to the camera, and used to provide lighting when the image sensor captures an image; A second processing module is respectively connected to the light source module and the first processing module signal, the second processing module is used to obtain the vertical synchronization clock signal from the first processing module, and generate a PWM control signal according to the vertical synchronization clock signal, and output the PWM control signal to the light source module; wherein the PWM control signal and the vertical synchronization clock signal have at least the same frequency, and the PWM control signal is used to control the light source module to flash at the frequency of the PWM control signal.

2. The light source system according to claim 1, characterized in that: The PWM control signal and the vertical synchronization clock signal also have the same phase.

3. The light source system according to claim 2, characterized in that: The first processing module has a first vertical synchronization interface, the second processing module has a second vertical synchronization interface, and the first vertical synchronization interface and the second vertical synchronization interface are connected via a vertical synchronization signal line.

4. The light source system according to claim 2, characterized in that: The PWM control signal and the vertical synchronization clock signal also have the same pulse width.

5. The light source system according to claim 4, characterized in that: The second processing module is further used to obtain the exposure value of the image sensor from the first processing module, and determine the target pulse width according to the exposure value, wherein the target pulse width is the pulse width of the vertical synchronization clock signal; Generating a PWM control signal according to the vertical synchronization clock signal comprises: A PWM control signal having the target pulse width is generated according to the vertical synchronization clock signal and the target pulse width.

6. The light source system according to claim 5, characterized in that: The first processing module is further used to obtain the current frame image data output by the image sensor; determine at least the brightness control signal of the light source module according to the current frame image data, and output the brightness control signal to the second processing module; The second processing module is further configured to obtain the brightness control signal from the first processing module, and output the brightness control signal to the light source module to adjust the instantaneous brightness of the light source module.

7. The light source system according to claim 6, characterized in that: Also includes: The digital-to-analog conversion module is connected between the second processing module and the light source module, and is used to convert the brightness control signal into an analog DC voltage and then output it to the light source module to control the instantaneous brightness of the light source module.

8. The light source system according to claim 6, characterized in that: The first processing module has a first communication interface, the second processing module has a second communication interface, and the first communication interface and the second communication interface are communicatively connected.

9. The light source system according to any one of claims 1 to 8, characterized in that: The first processing module and the second processing module are both field programmable gate array controllers.

10. An endoscope, characterized in that: include: A camera system, comprising a camera, an image sensor disposed in the camera, and a first processing module connected to the camera, wherein the first processing module is used to generate a vertical synchronization clock signal and output it to the image sensor, so that the image sensor is exposed under the control of the vertical synchronization clock signal; and The light source system as claimed in any one of claims 1 to 9, connected to the camera.

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