Dual camera control circuit and control method

Abstract

The present invention relates to the field of intelligent control and discloses a dual-camera control circuit and control method. The circuit includes a first camera, a second camera, a low-voltage differential signal (LVDS) hub, and a domain controller. The first camera and the second camera are electrically connected to one end of the LVDS hub via a first LVDS line and a second LVDS line, respectively. The other end of the LVDS hub is electrically connected to the domain controller via a third LVDS line. The present invention improves the utilization rate of image data.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control, and in particular to a dual-camera control circuit and a control method. Background Art

[0002] With the rapid development of intelligent control and intelligent driving technologies, users have higher and higher requirements for vehicle intelligence. While hoping to accurately control the vehicle, they also want to make full use of various collected data. This also puts higher requirements on the accuracy of dual-camera control and resource utilization.

[0003] The traditional dual-camera control circuit connects two 2D infrared cameras to an on-board ECU (Electronic Control Unit) module via LVDS (Low-Voltage Differential Signaling) signal lines. The on-board ECU module collects, analyzes, and processes the image data from the two 2D infrared cameras, and sends corresponding CAN (Controller Area Network) signals to the vehicle's CAN network to implement corresponding control operations. This dual-camera control circuit has major drawbacks. It requires the on-board ECU module to perform specific control and cannot reuse image data in the CAN network. In other words, this dual-camera control circuit not only wastes resources due to the need for separate control by the on-board ECU module, but also results in low image data utilization due to the inability to reuse image data. Summary of the Invention

[0004] The main purpose of the present invention is to propose a dual-camera control circuit and a control method, aiming to solve the technical problem of how to improve the utilization rate of image data.

[0005] To achieve the above objectives, the present invention provides a dual-camera control circuit, which includes a first camera, a second camera, a low-voltage differential signal (LVDS) hub, and a domain controller. The first camera and the second camera are electrically connected to one end of the LVDS hub through a first LVDS line and a second LVDS line, respectively, and the other end of the LVDS hub is electrically connected to the domain controller through a third LVDS line.

[0006] Optionally, the first camera is a time-of-flight 3D imaging 3D-TOF camera, and the second camera is a driver monitoring system DMS camera.

[0007] Optionally, the LVDS hub includes a switch selector, a deserializer module, an image processor ISP unit and a serializer module, and the switch selector, the deserializer module, the ISP unit and the serializer module are electrically connected in sequence.

[0008] Optionally, the first selection terminal and the second selection terminal of the switch selector are connected to the first LVDS line and the second LVDS line respectively.

[0009] Optionally, the serializer module is connected to the third LVDS line.

[0010] Optionally, the LVDS hub also includes a default operating condition circuit, which includes a DC voltage conversion module DC / DC, a first resistor, an NPN transistor, a second resistor and a third resistor. The input end of the DC voltage conversion module DC / DC is connected to the third LVDS line, the output end of the DC voltage conversion module DC / DC is connected to one end of the first resistor, the other end of the first resistor is connected to the collector of the NPN transistor and the ISP unit, the emitter of the NPN transistor is connected to the system power ground, the base of the NPN transistor is connected to one end of the second resistor and the third resistor, the other end of the second resistor is connected to the system power ground, and the other end of the third resistor is connected to the serializer module.

[0011] In addition, to achieve the above-mentioned object, the present invention further provides a dual-camera control method, which is applied to the default working condition circuit in the above-mentioned dual-camera control circuit. The steps of the dual-camera control method include:

[0012] Acquire input level information of the serializer module, and determine output level information of the default working condition circuit according to the input level information;

[0013] Actual conduction information is determined according to the output level information.

[0014] Optionally, the step of determining the output level information of the default operating condition circuit according to the input level information includes:

[0015] If the input level information is a low level, the NPN transistor in the default working condition circuit is not turned on;

[0016] The output end of the default operating condition circuit is connected to the output end of the DC voltage conversion module DC / DC, and the output level information is a high level.

[0017] Optionally, the step of determining the output level information of the default operating condition circuit according to the input level information further includes:

[0018] If the input level information is a high level, the NPN transistor in the default working condition circuit is turned on;

[0019] The output end of the DC voltage conversion module DC / DC is connected to the system power ground, and the output level information is a low level.

[0020] Optionally, the step of determining actual conduction information according to the output level information includes:

[0021] If the output level information is a high level, the switch selector is controlled to connect to the first selection end, and the actual conduction information is conducted with the first camera via the first LVDS line;

[0022] If the output level information is a low level, the switch selector is controlled to connect to the second selection end, and the actual conduction information is conducted with the second camera through the second LVDS line.

[0023] The dual-camera control circuit of the present invention includes a first camera, a second camera, a low-voltage differential signal (LVDS) hub, and a domain controller. The first camera and the second camera are electrically connected to one end of the LVDS hub via a first LVDS line and a second LVDS line, respectively, and the other end of the LVDS hub is electrically connected to the domain controller via a third LVDS line. Controlling the first and second cameras via the LVDS hub and the domain controller avoids the need for separate on-board ECU modules to control the first and second cameras in the prior art. This dual-camera control circuit not only eliminates the need for separate on-board ECU modules for control, thereby saving resources, but also directly controls the first and second cameras via the domain controller, converting image data from the internal data of the on-board ECU module to data within the entire domain controller, thereby improving the utilization rate of image data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of an embodiment of a dual-camera control circuit of the present invention;

[0025] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of an LVDS hub circuit in a dual-camera control circuit of the present invention;

[0026] Figure 3 This is a circuit structure diagram of an embodiment of a default working condition circuit in a dual-camera control circuit of the present invention;

[0027] Figure 4 Schematic diagram of image conversion of 3D-TOF camera in the dual-camera control circuit of the present invention;

[0028] Figure 5 This is a schematic diagram of image conversion for a 2D infrared camera in a dual-camera control circuit of the present invention;

[0029] Figure 6 This is a flow chart of a first embodiment of a dual-camera control method according to the present invention;

[0030] Figure 7 This is a schematic diagram of the technical solution flow of the dual-camera control method of the present invention.

[0031] Description of Figure Numbers:

[0032] Label name Label name 10 First Camera 20 First LVDS line 30 Second camera 40 Second LVDS line 50 LVDS hub 60 The third LVDS line 70 domain controller 51 switch selector 52 Deserializer module 53 ISP unit 54 Serializer Module 55 Default operating circuit 56 DC / DC voltage conversion module T1 NPN transistor R1 First resistor R2 Second resistor R3 The third resistor

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention provides a dual-camera control circuit.

[0038] In one embodiment of the present invention, Figure 1As shown, a structural diagram of an embodiment of a dual-camera control circuit is shown, which includes a first camera 10, a second camera 30, a low voltage differential signal LVDS hub 50 and a domain controller 70. The first camera 10 and the second camera 30 are electrically connected to one end of the LVDS hub 50 through a first LVDS line 20 and a second LVDS line 40 respectively, and the other end of the LVDS hub 50 is electrically connected to the domain controller 70 through a third LVDS line 60.

[0039] In this embodiment, image data captured by the first camera 10 and the second camera 30 is transmitted back to the LVDS hub 50 via the first LVDS line 20 and the second LVDS line, respectively. After processing the data, the LVDS hub 50 transmits the processed image data to the domain controller 70 via the third LVDS line 60. The domain controller 70 then controls the vehicle based on the returned image data, thus avoiding the need for a separate on-board ECU module to control the cameras in traditional dual-camera control circuits. This control method has a drawback: the on-board ECU modules maintain absolute independence of their internal data, preventing data transfer between modules. This means that the data collected by the on-board ECU modules is processed solely for that function and does not transfer image data to other modules for further processing. By replacing the module that processes camera data with a domain controller, the previously single module is split, allowing image data to be directly controlled by the domain controller. This avoids the issue of data transfer between modules and allows the domain controller to accurately access image data, improving image data utilization.

[0040] The first camera 10 is a time-of-flight 3D imaging 3D-TOF camera, and the second camera 30 is a driver monitoring system DMS camera.

[0041] In this embodiment, the first camera, typically used to implement FaceID facial recognition, is mounted on the outside of the vehicle's B-pillar. This camera outputs image data for facial recognition, allowing the vehicle owner or other authorized legitimate users to unlock the vehicle door and enter the vehicle by scanning their face. Traditional 2D infrared cameras perform poorly in anti-counterfeiting and malicious attacks, posing a significant security risk. This invention, however, utilizes a 3D-TOF camera, which combines the 24 / 7 capabilities of a 2D infrared camera with the third-dimensional depth information to protect against malicious attacks such as photos, masks, and head models. The 3D-TOF camera collects and analyzes image data, then sends a "door unlock" control signal to a domain controller or central brain. Ultimately, the vehicle's body control module (BCM) unlocks the door. DMS cameras typically use 2D infrared cameras, typically mounted on the inside of the vehicle's A-pillar or steering column. The domain controller or central brain collects, analyzes and processes the image data of the DMS camera, and then sends a control signal of "mild fatigue, please drive carefully" through the domain controller or central brain. Finally, the multimedia module in the car realizes voice playback and the air-conditioning module increases the cold air to "blow on the feet and face."

[0042] In one embodiment, referring to Figure 2 As shown in FIG, a circuit structure diagram of an embodiment of an LVDS hub circuit in a dual-camera control circuit, the LVDS hub 50 includes a switch selector 51, a deserializer module 52, an image processor ISP (Image Signal Processor) unit 53 and a serializer module 54, and the switch selector 51, the deserializer module 52, the ISP unit 53 and the serializer module 54 are electrically connected in sequence.

[0043] In this embodiment, the switch selector 51 is connected to the data input end of the deserializer module 52, and the data output end of the deserializer module 52 is connected to the data input end of the ISP unit 53 through the data transmission line I2C and RAW, where RAW refers to the original image data transmitted, and the data transmission line I2C reversely controls the camera or obtains the status information of the camera through a specific communication protocol. The data output end of the ISP unit 53 is connected to the input end of the serializer module 54 through MIPI and the data transmission line I2C, where MIPI is a data transmission protocol for transmitting data. In the control circuit of the present invention, the dual camera (including 1 3D-TOF camera and 1 DMS camera) module does not contain an ISP unit, but adds an ISP unit to the LVDS hub module at the back end. In this way, the price of 1 ISP unit is saved in terms of hardware cost! However, the image data ultimately output by the LVDS hub module (whether it is the image data of the 3D-TOF camera after being processed by the ISP unit in the LVDS hub module, or the image data of the 2D infrared camera after being processed by the ISP unit in the LVDS hub module) fully meets the requirements of subsequent algorithm calculations; and the frame rate and performance of the dual-camera device are not affected in any way.

[0044] The first selection terminal and the second selection terminal of the switch selector 51 are connected to the first LVDS line 20 and the second LVDS line 40 respectively.

[0045] The serializer module 54 is connected to the third LVDS line 60 .

[0046] In this embodiment, the first and second selection terminals of the switch selector 51 are connected to the first and second LVDS lines 20 and 40, respectively, and the serializer module 54 is connected to the third LVDS line 60. This completes the control circuit for the entire dual-camera system. When controlling the dual cameras, the LVDS hub is first initialized. The initialization steps involve the serializer module 54, the ISP unit 53, and the deserializer module 52. After initialization is complete, power is selectively supplied to the two cameras. Power is supplied via the first and second LVDS lines 20 and the third LVDS line. The LVDS lines can simultaneously transmit data, power, and I2C signals. By powering the two cameras separately and allowing them to operate independently, control accuracy can be improved and control costs can be reduced.

[0047] In one embodiment, referring to Figure 3As shown, a circuit structure diagram of an embodiment of a default working condition circuit in a dual-camera control circuit is shown. The LVDS hub 50 also includes a default working condition circuit 55. The default working condition circuit 55 includes a DC voltage conversion module DC / DC 56, a first resistor R1, an NPN transistor T1, a second resistor R2, and a third resistor R3. The input end of the DC voltage conversion module DC / DC 56 is connected to the third LVDS line 60, and the output end of the DC voltage conversion module DC / DC 56 is connected to one end of the first resistor R1. The first resistor R1 is far away from the DC voltage conversion module DC / DC One end of the output end of 56 is connected to the collector of the NPN transistor T1 and the ISP unit 53, the emitter of the NPN transistor T1 is connected to the system power ground, the base of the NPN transistor T1 is connected to the second resistor R2 and one end of the third resistor R3, the end of the second resistor R2 away from the base of the NPN transistor T1 is connected to the system power ground, and the end of the third resistor R3 away from the base of the NPN transistor T1 is connected to the serializer module 54.

[0048] In this embodiment, the camera is individually controlled by the default operating circuit 55. According to the working principles of the two cameras, there are actually two different usage scenarios corresponding to the FaceID function and the DMS function on the vehicle: First, the usage scenario of FaceID, the current vehicle is in a locked state, and the entire vehicle electrical appliance is in a low-power mode. When the owner or other authorized legal user approaches the vehicle (for example, standing next to the B-pillar of the vehicle), the domain controller / central brain on the vehicle is triggered, and the domain controller / central brain module collects the image data of the FaceID camera to perform face recognition algorithm calculations. Finally, the domain controller / central brain module decides whether to unlock the door based on the face recognition result information. Secondly, regarding the DMS usage scenario, when the driver or other authorized legitimate user has completed a series of actions, including entering the vehicle, sitting in the driver's seat, and starting the vehicle, and the vehicle is traveling at a certain speed, the domain controller / central brain module collects image information from the DMS camera and performs algorithm calculations such as face detection, driver fatigue and distraction identification, dangerous driver action detection, and driver absence detection. Ultimately, based on the algorithmic results, the domain controller / central brain module decides whether to alert the driver or proactively implement controls such as steering wheel vibration, seat vibration, and air conditioning cooling air blowing to the head and face to encourage driver attention and ensure driving safety. Clearly, the FaceID and DMS functions cannot be triggered simultaneously. This means that both cameras do not need to be powered simultaneously for operation. The LVDS lines connecting the two cameras can be selectively connected to achieve independent control and power supply for each camera. As shown in the figure, the serializer module's input serves as the input to the default operating circuit, while the ISP unit receives the output of the default operating circuit. The present invention defines a default state where the serializer module input is low to control the power supply of the first camera, and a non-default state where the serializer module input is high to control the power supply of the second camera. This allows the two cameras to be powered separately.

[0049] Further, refer to Figure 6 As shown, a flow chart of a first embodiment of a dual-camera control method of the present invention is proposed based on an embodiment of the above-mentioned default working condition circuit. The steps of the dual-camera control method include:

[0050] Step S10, obtaining input level information of the serializer module, and determining output level information of the default working condition circuit according to the input level information;

[0051] In this embodiment, the default operating circuit determines the input level information of the serializer module and selectively powers the cameras based on the input level information, so that the two cameras can be powered as needed. The input level information refers to high and low level information, wherein the step of determining the output level information of the default operating circuit based on the input level information includes:

[0052] Step S11: if the input level information is a low level, the NPN transistor in the default working condition circuit is not turned on;

[0053] In step S12, the output end of the default operating condition circuit is connected to the output end of the DC voltage conversion module DC / DC, and the output level information is a high level.

[0054] In this embodiment, according to Figure 3 As can be seen, when the serializer module's input level information is low, the transistor will not conduct due to the lack of voltage between the base and emitter, that is, the transistor is in a high-resistance state. However, the collector is powered by a power supply, so the power supply is directly connected to the ISP unit through a resistor, resulting in a high output level information. The output level information refers to the high and low states of the output level.

[0055] The step of determining the output level information of the default operating condition circuit according to the input level information further includes:

[0056] Step S13: If the input level information is a high level, the NPN transistor in the default working condition circuit is turned on;

[0057] In step S14 , the output end of the DC / DC voltage conversion module is connected to the system power ground, and the output level information is a low level.

[0058] In this embodiment, according to Figure 3 It can be seen that when the input level information of the serializer module is high, the transistor will be turned on due to the voltage between the base and emitter. In other words, the power supply of the transistor's collector can be connected to the system power ground through the transistor. This is equivalent to the connection line of the ISP unit being disconnected, so the output level information is low.

[0059] Step S20: determining actual conduction information according to the output level information.

[0060] In this embodiment, after the output level information is obtained, the level information is used as the output level information of the ISP unit, and the switch selector is controlled according to the output level information. The step of determining the actual conduction information according to the output level information includes:

[0061] Step S21: If the output level information is a high level, the switch selector is controlled to connect to the first selection end, and the actual conduction information is connected to the first camera via the first LVDS line;

[0062] In this embodiment, when the output level information of the ISP unit is a high level, the switch selector will be controlled, mainly to control the switch selector to select the connection to the first selection end, that is, the actual conduction information is connected to the first camera through the first LVDS line. Among them, the switch selector refers to a device similar to a selection switch. The difference is that the selection switch manually selects the switch to be turned on according to the user's wishes, while the switch selector of this application is turned on according to high and low levels. For example, the switch selector contains three endpoints, namely the fixed endpoint a, the selection endpoint b and the selection endpoint c. The switch selector can be defined as follows: when the switch selector receives a high level, the fixed endpoint a will be connected to the selection endpoint b, and when the switch selector receives a low level, the fixed endpoint a will be connected to the selection endpoint c, thereby realizing the effect of switch selector level control. After the original image data of the first camera is collected, it will be processed by the ISP unit. As follows Figure 4 As shown in the figure, the image conversion diagram of the 3D-TOF camera in the dual camera control circuit, the original image information in RAW format output by the 3D-TOF camera, 1 frame of RAW original image information contains three phases, Q1, Q2, Q3, etc., where each phase represents the photoelectric conversion value collected at a specific time t, and the width (Width) and height (Height) of Q1, Q2, Q3 are equal to the width and height of the final calculated infrared image, and the width and height of Q1, Q2, A3 are also equal to the width and height of the final calculated depth information. Figure 4 In the equation, IR represents the final calculated infrared image, and Depth represents the final calculated depth information. First, the infrared image can be calculated by the values of the three phases Q1, Q2, and Q3:

[0063] IR=f IR (Q1, Q2, Q3)

[0064] The depth information can be calculated using Q1, Q2, Q3 and IR:

[0065] Depth = f depth (Q1, Q2, Q3, IR)

[0066] The infrared image and depth information resolution calculated by the ISP unit in the LVDS hub module is both Width × Height. Therefore, the ISP unit packages the infrared image and depth information into a Width × Height × 2 data frame and transmits it via the LVDS transmission line. The first camera is independently powered and controlled via a switch selector and default operating circuit.

[0067] Step S22: If the output level information is a low level, the switch selector is controlled to connect to the second selection end, and the actual conduction information is connected to the second camera through the second LVDS line.

[0068] When the output level information of the ISP unit is low, it will also control the switch selector, mainly to control the switch selector to connect to the second selection end, that is, the actual conduction information is connected to the second camera through the second LVDS line. After collecting the raw image data of the second camera, it will be processed by the ISP unit. Figure 5 Figure 2 shows a schematic diagram of image conversion for a 2D infrared camera in a dual-camera control circuit. The 2D infrared camera outputs RAW format raw image information, and the resolution of one frame of RAW raw image information is Width × Height. The YUV422 format images calculated by the ISP unit in the LVDS hub module are still Width × Height. The LVDS hub module ultimately sends YUV422 format infrared image data frames to the vehicle's domain controller / central brain module via the LVDS transmission line. The values representing the U and V components in the YUV422 format image data are both 0x80. The second camera is independently powered and controlled via a switch selector and the default operating circuit.

[0069] Furthermore, the present embodiment also provides a technical solution schematic flow diagram of a dual-camera control method, referring to Figure 7In this embodiment, POC (power over coaxial) is performed through the third LVDS line connecting the LVDS hub module and the vehicle domain controller / central brain module. After the LVDS hub module is powered, the camera will not be connected immediately, but the modules inside the LVDS hub module will be initialized. After waiting for the initialization to be completed, it will be detected whether the input in the default working condition circuit is low (default working condition). When the input is low, the default working condition circuit will control the first LVDS line to connect to the LVDS hub module, so that the 3D-TOF camera of the FaceID function can work normally, and the 2D infrared camera line will be disconnected; when the input is high (non-default working condition), the default working condition circuit will control the second LVDS line to connect to the LVDS hub module, so that the 2D infrared camera can work normally, and the 3D-TOF camera line of the FaceID function will be disconnected. The default working condition circuit realizes the separate control of the camera and saves control costs.

[0070] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A dual-camera control circuit, characterized in that: The dual-camera control circuit includes a first camera, a second camera, a low voltage differential signal (LVDS) hub, and a domain controller, wherein the first camera and the second camera are electrically connected to one end of the LVDS hub via a first LVDS line and a second LVDS line, respectively, and the other end of the LVDS hub is electrically connected to the domain controller via a third LVDS line; In which, the LVDS hub includes a switch selector, a deserializer module, an image processor ISP unit and a serializer module, the switch selector, the deserializer module, the ISP unit and the serializer module are electrically connected in sequence, and the LVDS hub also includes a default operating circuit, the default operating circuit includes a DC voltage conversion module DC / DC, a first resistor, an NPN transistor, a second resistor and a third resistor, the input end of the DC voltage conversion module DC / DC is connected to the third LVDS line, the output end of the DC voltage conversion module DC / DC is connected to one end of the first resistor, the other end of the first resistor is connected to the collector of the NPN transistor and the ISP unit, the emitter of the NPN transistor is connected to the system power ground, the base of the NPN transistor is connected to one end of the second resistor and the third resistor, the other end of the second resistor is connected to the system power ground, and the other end of the third resistor is connected to the serializer module.

2. The dual-camera control circuit according to claim 1, wherein: The first camera is a time-of-flight 3D imaging 3D-TOF camera, and the second camera is a driver monitoring system DMS camera.

3. The dual-camera control circuit according to claim 1, wherein: The first selection terminal and the second selection terminal of the switch selector are connected to the first LVDS line and the second LVDS line respectively.

4. The dual-camera control circuit according to claim 1, wherein: The serializer module is connected to the third LVDS line.

5. A dual-camera control method, characterized in that: The dual-camera control method is applied to the dual-camera control circuit of claim 1, and the steps of the dual-camera control method include: Acquire input level information of the serializer module, and determine output level information of the default working condition circuit according to the input level information; Actual conduction information is determined according to the output level information.

6. The dual-camera control method according to claim 5, wherein: The step of determining the output level information of the default operating condition circuit according to the input level information comprises: If the input level information is a low level, the NPN transistor in the default working condition circuit is not turned on; The output end of the default operating condition circuit is connected to the output end of the DC voltage conversion module DC / DC, and the output level information is a high level.

7. The dual-camera control method according to claim 5, wherein: The step of determining the output level information of the default working condition circuit according to the input level information further includes: If the input level information is a high level, the NPN transistor in the default working condition circuit is turned on; The output end of the DC voltage conversion module DC / DC is connected to the system power ground, and the output level information is a low level.

8. The dual-camera control method according to claim 5, wherein: The step of determining actual conduction information according to the output level information comprises: If the output level information is a high level, the switch selector is controlled to connect to the first selection end, and the actual conduction information is conducted with the first camera via the first LVDS line; If the output level information is a low level, the switch selector is controlled to connect to the second selection end, and the actual conduction information is conducted with the second camera through the second LVDS line.

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