A video signal processing circuit capable of switching between bright and dark modes

Abstract

The utility model discloses a kind of video signal processing circuit with switchable bright-dark mode, belong to image processing field.The circuit includes image sensor, image processor, auxiliary circuit, optical filter switching circuit, video output circuit and software storage module, auxiliary circuit contains power supply circuit, light detection circuit, current compensation circuit and power voltage detection circuit.Image sensor acquires image and transmits to image processor, and after being handled, it is output by video output circuit;Power supply circuit supplies power for each element after external voltage is bucked, light detection circuit transmits illumination signal, and image processor realizes mode switching by optical filter switching circuit accordingly.The circuit is integrated by module and is connected pertinently, provides stable bright-dark mode switching hardware platform, simple structure, without additional expansion peripheral circuit, can be directly used for software operation debugging, applicable to video monitoring and the like scene.

Description

Technical Field

[0001] This utility model relates to the field of image processing, and in particular to a video signal processing circuit with switchable brightness and darkness modes. Background Technology

[0002] In scenarios such as video surveillance, security monitoring, and industrial vision, video signal processing circuits are core hardware. Their main function is to acquire external image information through image sensors, process it through an image processor, and then output a clear and stable video signal through a video output circuit to meet the image observation needs in different environments. In practical applications, the ambient light intensity often changes significantly between day and night, so the circuit needs to have the ability to switch between light and dark modes, adjusting the hardware operating state to ensure image quality.

[0003] Existing circuits for video signal processing lack a dedicated hardware architecture design for switching between light and dark modes. The circuit connections and coordination methods of each module do not take into account the requirements for mode switching, making it impossible to form a stable hardware support platform, which makes it difficult to reliably implement the light and dark mode switching function. Utility Model Content

[0004] The technical problem this utility model aims to solve is that there is currently no suitable hardware circuit for writing video signal programs for vehicle status monitoring, nor is there hardware equipment for adjusting brightness levels. Purchasing corresponding hardware circuits on the market is costly, difficult to maintain and modify, and suffers from poor hardware compatibility. The beneficial effect of this application is to propose a cost-effective circuit that can support hardware-based adjustment of brightness levels, and is characterized by high cost-effectiveness and ease of maintenance. This application merely provides a low-cost hardware circuit that can be programmed and does not involve any control methods.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A video signal processing circuit with switchable brightness and darkness modes is characterized by including an image sensor, an image processor, auxiliary circuits, a filter switching circuit, a video output circuit, and a software storage module.

[0007] The auxiliary circuit includes a power supply circuit, a light detection circuit, a current compensation circuit, and a power supply voltage detection circuit.

[0008] The image sensor acquires external images and inputs them to the image processor. The image processor processes the image data and outputs it to the video output circuit, where it is amplified and then output. The software storage module is connected to the graphics processor and controls the control part of the graphics processor.

[0009] The power supply circuit receives external voltage, steps it down, and then provides power input to each component; the power supply voltage detection circuit is connected to the image processor; the current compensation circuit is connected to the image processor.

[0010] The light detection circuit is connected to the image processor to transmit light signals; the image processor is connected to the filter switching circuit to transmit switching signals.

[0011] Preferably, the image sensor U2 uses an SC1335 chip. The AVDD pin of this chip is connected to a 2.8V voltage, the DOVDD pin is connected to a 1.8V voltage, and the DVDD pin is connected to a 1.8V pin. The EXTCLK, PWDNB, SDA, and SCL pins are connected to the image processor. The data output ports D0-D9, PCLK, LREF, and FSYNC pins are connected to the image processor. The VREF2, VREFH, VREFN, and SID pins are grounded.

[0012] Preferably, the image processor U7 uses an XC5321A chip, and its pins are divided into a data receiving section, a power supply section, a DAC section, and a control section. In the data receiving section, Y0-Y9 are respectively connected to D0-D9, the PCLK pin is connected to the corresponding pin of the image sensor, the HREF pin is connected to the LREF pin of U2, the VSYNC pin is connected to the FSYNC pin of U2, the CCLK pin is connected to the EXCLK pin of the image sensor, the SNR_RESET pin is connected to the PWDNB pin of U2, and the I2C_SCK and I2C_SDA pins are respectively connected to the SCL and SDA pins of U2.

[0013] In the power supply section, the CVDD pin is connected to 1.1V, VDDIO1 to 1.8V, VDDIO2 to 3.3V, VDDIO3 to 1.8V, the DAC_AVDD pin to 3.3V, and the ground pin to ground.

[0014] In the DAC section, the DAC_IOUT pin is connected to the video output circuit, the DAC_COMP pin is connected to 3.3V voltage, and the DAC_RESET pin is grounded.

[0015] In the control section, the SPI_CSN, SPI_SCK, SPI_MOSI, and SPI_MISO pins are connected to the software storage module; the XI and XO pins are connected to the two ends of the crystal oscillator X1; the ICR_OFF and ICR_ON pins are connected to the filter switching circuit; the SETTING_SEL pin is connected to the external input through a pull-up resistor; GPIO0 is connected to the current compensation circuit; the RESETB pin is connected to the power supply voltage detection circuit; the TND pin is connected to the light detection circuit; and the UART_TX is connected to the 3.3V power supply.

[0016] Preferably, the power supply circuit includes a 12V circuit, a 3.3V circuit, a 1.1V circuit, a 2.8V circuit, and a 1.8V circuit;

[0017] The input terminal of the 12V circuit is connected to a 24V power supply. The 24V voltage is shaped by diode D3 and inductor L6, and after being connected in parallel with filter capacitors C37, C38, and C39, it is connected to the IN and EN pins of U9. The BST pin of U9 is connected to bootstrap capacitor C36, and the other end of C36 is connected to the SW pin of U9 and the negative terminal of protection diode D2. The SW pin of U9 is connected to resistor R26, the positive terminal of voltage regulator capacitor C41, and filter capacitor C40 through inductor L7. The other end of R26 is connected to the FB pin of U9 and resistor R30, and the other end of R30 is grounded. The other end of C40 and the negative terminal of C41 are grounded. U9 uses a JW5026 chip.

[0018] The input terminal of the 3.3V power supply circuit is connected to the 24V voltage output from the negative terminal of D3 in the 12V circuit. After passing through the LC rectifier circuit, it is connected to the IN and EN pins of U8, which is a JW5017S chip. The BST pin of U8 is connected to the bootstrap capacitor C26, and the other end of C26 is connected to the SW pin of U8 and the negative terminal of the protection diode D1. The SW pin of U8 is connected to the resistor R17 and the voltage regulator filter capacitor array through the inductor L5. The other end of R17 is connected to the FB pin of U8 and the resistor R21, and the other end of R21 is grounded.

[0019] The 2.8V power supply circuit includes chip U4, which uses XC6221B282MR voltage regulator chip. The EN and VIN terminals of U2 are connected in parallel with voltage regulator capacitor C7 to the 3.3V power supply. The output terminal is connected in parallel with voltage regulator capacitor C8 to output 2.8V voltage.

[0020] The 1.8V power supply circuit includes chip U5, which uses XC6206P182MR voltage regulator chip, and a voltage regulator capacitor C16 connected in parallel to the VIN terminal of U4 to connect to the 3.3 power supply. The output terminal Vout outputs a 1.8V voltage.

[0021] The 1.1V power supply circuit includes U6, which uses an MT3410L chip. The VIN and SN pins of U6 are connected in parallel with a voltage regulator capacitor C23 to a 3.3V power supply. The SW pin is connected to one end of an inductor L2. The other end of L2 is connected to a resistor R11, the positive terminal of capacitor C22, C18, C19, C20, and C21, respectively. The other ends of capacitors C18, C19, C20, and C21 and the negative terminal of C22 are grounded. The other end of R11 is connected to the FB pin and a resistor R13, respectively. The other end of R13 is grounded.

[0022] Preferably, the software storage module includes U11, which uses an M25Q41 chip. The CS pin of U11 is connected to the SPI_CSN pin of U7, the SO pin is connected to the SPI_MISO pin of U7, the SCK pin is connected to the SPI_SCK pin of U7, the SI pin is connected to the SPI_MOSI pin of U7, the WP pin is connected to one end of resistor R29, the other end of R29 is connected to a 3.3V power supply, the VCC pin and the HOLD pin are connected to a 3.3V power supply, and the VSS pin is grounded.

[0023] Preferably, the power supply voltage detection circuit includes U10, which uses the HE809 chip. The VCC pin of U10 is connected to a 3.3V power supply, the RESET pin is connected to the RESETB pin of U7, and the GND pin of U9 is grounded.

[0024] Preferably, the input terminal of the video output module is connected to the DAC_OUT pin of U7, the input terminal of the video output module is connected to the IN pin of U1 through an RC circuit, the VCC and PS pins of U1 are connected to a 3.3V power supply, the OUT pin of U1 is connected to interface 1 of external interface J1 through R1; interface 2 of J1 is grounded, and interface 3 is connected to a 24V power supply; U1 uses an MS1681 chip.

[0025] Preferably, in the photosensitive detection circuit, JP2's interface 1 is connected to a 12V power supply, interface 2 is grounded, interface 3 is externally connected to a photoresistor, and internally connected to the base of transistor Q1 through resistor R8. The emitter of Q1 is grounded, and the collector is connected to the TND pin of U7 and resistor R7 respectively. The other end of R7 is connected to a 3.3V voltage.

[0026] Preferably, the filter switching circuit includes U3, which uses a BA6208L chip; the BIN pin of U3 is connected to the ICR_OFF pin of U7, and is connected to a pull-up resistor and a 3.3V power supply; the AIN pin of U3 is connected to the ICR_ON pin of U7, and is connected to a pull-up resistor and a 3.3V power supply; the VCC pin of U3 is connected to a filter capacitor and a 12V power supply respectively; the AOUT and BOUT pins of U3 are connected to interfaces 1 and 2 of JP1 respectively; and the GND pin of U3 is grounded.

[0027] Preferably, the current compensation circuit includes a transistor Q3, the base of which is connected to the GPIO0 pin of U7 via a resistor and to a 3.3V power supply via a pull-up resistor; the collector of Q3 is connected to the 3.3V power supply; and the emitter of Q3 is grounded.

[0028] The beneficial effects of adopting the above technical solution are as follows:

[0029] This invention integrates modules and designs targeted circuit connections to form a complete hardware platform specifically designed to support the implementation of the light / dark mode switching function. The modules work together to provide a stable hardware foundation for mode switching, eliminating the need for users to expand external circuits and allowing them to run and debug software directly on this hardware platform. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is the wiring diagram of the image sensor in this utility model;

[0032] Figure 2 This is the wiring diagram of the image processor in this utility model;

[0033] Figure 3 This is the circuit diagram of the 12V power supply circuit in this utility model;

[0034] Figure 4 This is the circuit diagram of the 3.3V power supply circuit in this utility model;

[0035] Figure 5 This is the circuit diagram of the 1.1V power supply circuit in this utility model.

[0036] Figure 6 This is a circuit diagram of the 1.8V and 2.8V power supply circuits in this utility model;

[0037] Figure 7 This is a circuit diagram of the software storage module in this utility model;

[0038] Figure 8 This is a circuit diagram of the power supply voltage detection module in this utility model;

[0039] Figure 9 This is a circuit diagram of the video output module in this utility model;

[0040] Figure 10 This is a circuit diagram of the photosensitive detection circuit in this utility model;

[0041] Figure 11 This is a circuit diagram of the filter switching circuit in this utility model;

[0042] Figure 12 This is a circuit diagram of the current compensation circuit in this utility model. Detailed Implementation

[0043] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0044] A video signal processing circuit with switchable brightness and darkness modes includes an image sensor, an image processor, auxiliary circuits, a filter switching circuit, a video output circuit, and a software storage module.

[0045] The auxiliary circuit includes a power supply circuit, a light detection circuit, a current compensation circuit, and a power supply voltage detection circuit;

[0046] The image sensor acquires external images and inputs them to the image processor. The image processor processes the image data and outputs it to the video output circuit, where it is amplified and then output. The software storage module is connected to the graphics processor and controls the control part of the graphics processor.

[0047] The power supply circuit receives external voltage, steps it down, and then provides power input to each component; the power supply voltage detection circuit is connected to the image processor; the current compensation circuit is connected to the image processor.

[0048] The light detection circuit is connected to the image processor to transmit light signals; the image processor is connected to the filter switching circuit to transmit switching signals.

[0049] like Figure 1 The image sensor U2 uses the SC1335 chip. The AVDD pin of this chip is connected to 2.8V, the DOVDD pin is connected to 1.8V, and the DVDD pin is connected to the 1.8V pin. The EXTCLK, PWDNB, SDA, and SCL pins are connected to the image processor. The data output ports D0-D9, PCLK, LREF, and FSYNC pins are connected to the image processor. The VREF2, VREFH, VREFN, and SID pins are grounded.

[0050] The image sensor is used to receive external images and has certain preprocessing functions, which are implemented through internal chip functions. The function calls are determined by receiving information from the image processor through the SDA and SCL pins. PWDNB is the energy-saving switch of U2, connected to U7, and receives the energy-saving switch signal. Data output ports D0-D9 output image data to the graphics processor, while PCLK, LREF, and FSYNC pins output clock signals and frame line valid signals as auxiliary signals for image data.

[0051] like Figure 2The image processor U7 uses the XC5321A chip, and its pins are divided into data receiving section, power supply section, DAC section and control section. In the data receiving section, Y0-Y9 are connected to D0-D9 respectively. The PCLK pin is connected to the corresponding pin of the image sensor. The HREF pin is connected to the LREF pin of U2. The VSYNC pin is connected to the FSYNC pin of U2. The CCLK pin is connected to the EXCLK pin of the image sensor. The SNR_RESET pin is connected to the PWDNB pin of U2. The I2C_SCK and I2C_SDA pins are connected to the SCL and SDA pins of U2 respectively.

[0052] All pins of the data receiving section are connected to the image sensor to acquire image information, and synchronous reset and clock synchronization are achieved with the image sensor.

[0053] In the power supply section, the CVDD pin is connected to 1.1V, VDDIO1 to 1.8V, VDDIO2 to 3.3V, VDDIO3 to 1.8V, the DAC_AVDD pin to 3.3V, and the ground pin is grounded; the power supply section is supported by the chip through power supply and grounding.

[0054] In the DAC section, the DAC_IOUT pin is connected to the video output circuit, the DAC_COMP pin is connected to the 3.3V voltage, and the DAC_RESET pin is grounded; the DAC section is the video output terminal, and the DAC_COMP pin provides the reference voltage.

[0055] In the control section, the SPI_CSN, SPI_SCK, SPI_MOSI, and SPI_MISO pins are connected to the software storage module; the XI and XO pins are connected to the two ends of the crystal oscillator X1; the ICR_OFF and ICR_ON pins are connected to the filter switching circuit; the SETTING_SEL pin is connected to the external input through a pull-up resistor; GPIO0 is connected to the current compensation circuit; the RESETB pin is connected to the power supply voltage detection circuit; the TND pin is connected to the light detection circuit; and the UART_TX is connected to the 3.3V power supply.

[0056] The control section is the part of the circuit that implements the functions. The software storage module is connected to the control section through the SPI_CSN, SPI_SCK, SPI_MOSI and SPI_MISO pins to realize data retrieval; the XI and XO pins obtain the crystal oscillator clock to provide clock support for the software; the ICR_OFF, ICR_ON, GPIO0, RESETB and TND pins are connected to various functional circuits to receive and send control signals.

[0057] The power supply circuit includes a 12V circuit, a 3.3V circuit, a 1.1V circuit, a 2.8V circuit, and a 1.8V circuit;

[0058] like Figure 3 The input of the 12V circuit is connected to a 24V power supply. The 24V voltage is shaped by diode D3 and inductor L6, and after being connected in parallel with filter capacitors C37, C38, and C39, it is connected to the IN and EN pins of U9. The BST pin of U9 is connected to bootstrap capacitor C36, and the other end of C36 is connected to the SW pin of U9 and the negative terminal of protection diode D2. The SW pin of U9 is connected to resistor R26, the positive terminal of voltage regulator capacitor C41, and filter capacitor C40 through inductor L7. The other end of R26 is connected to the FB pin of U9 and resistor R30, and the other end of R30 is grounded. The other end of C40 and the negative terminal of C41 are grounded. U9 uses the JW5026 chip. The 12V circuit is a 24V voltage step-down circuit. After shaping and filtering the external input current, it is input into the step-down chip. The voltage divider network composed of R26 and R30 provides feedback to the FB pin to achieve a 12V voltage output. After voltage regulation and filtering, the output is a stable 12V voltage.

[0059] like Figure 4 The input of the 3.3V power supply circuit is connected to the negative terminal of D3 in the 12V circuit, which outputs a 24V voltage. After passing through the LC rectifier circuit, the voltage is connected to the IN and EN pins of U8, which is a JW5017S chip. The BST pin of U8 is connected to the bootstrap capacitor C26, and the other end of C26 is connected to the SW pin of U8 and the negative terminal of the protection diode D1. The SW pin of U8 is connected to the resistor R17 and the voltage regulator filter capacitor array through the inductor L5. The other end of R17 is connected to the FB pin of U8 and the resistor R21, and the other end of R21 is grounded. The 3.3V power supply circuit is basically the same as the 12V power supply circuit, except that the voltage divider network is composed of resistors with different ratios to achieve a 3.3V output.

[0060] like Figure 6 The 2.8V power supply circuit includes chip U4, which uses XC6221B282MR voltage regulator chip. The EN and VIN terminals of U2 are connected in parallel with voltage regulator capacitor C7 to connect to the 3.3V power supply. The output terminal is connected in parallel with voltage regulator capacitor C8 to output 2.8V voltage.

[0061] The 1.8V power supply circuit includes chip U5, which uses an XC6206P182MR voltage regulator chip. The VIN terminal of U4 is connected in parallel with a voltage regulator capacitor C16 to a 3.3V power supply. The output terminal Vout outputs a 1.8V voltage.

[0062] like Figure 5The 1.1V power supply circuit includes U6, which uses the MT3410L chip. The VIN and SN pins of U6 are connected in parallel with a voltage regulator capacitor C23 to the 3.3V power supply. The SW pin is connected to one end of the inductor L2. The other end of L2 is connected to resistor R11, the positive terminal of capacitor C22, C18, C19, C20, and C21, respectively. The other ends of capacitors C18, C19, C20, and C21 and the negative terminal of C22 are grounded. The other end of R11 is connected to the FB pin and resistor R13, respectively. The other end of R13 is grounded.

[0063] like Figure 7 The software storage module includes U11, which uses the M25Q41 chip. The CS pin of U11 is connected to the SPI_CSN pin of U7, the SO pin to the SPI_MISO pin of U7, the SCK pin to the SPI_SCK pin of U7, the SI pin to the SPI_MOSI pin of U7, the WP pin to one end of resistor R29, and the other end of R29 to a 3.3V power supply. The VCC and HOLD pins are also connected to a 3.3V power supply, and the VSS pin is grounded. The M25Q41 serves as an erasable and rewritable serial FLASH memory used to store the software portion, exchanging data through the I / O ports connected to the U7 control section.

[0064] like Figure 8 The power supply voltage detection circuit includes U10, which uses the HE809 chip. The VCC pin of U10 is connected to a 3.3V power supply, the RESET pin is connected to the RESETB pin of U7, and the GND pin of U9 is grounded. The input terminal of the power supply voltage detection circuit is connected to a 3.3V power supply. When the power supply voltage is abnormal, a reset signal is promptly issued to reset the control section of U7, protecting the stability of the system.

[0065] like Figure 9 The input terminal of the video output module is connected to the DAC_OUT pin of U7. The input terminal of the video output module is connected to the IN pin of U1 via an RC circuit. The VCC and PS pins of U1 are connected to a 3.3V power supply. The OUT pin of U1 is connected to interface 1 of external interface J1 via R1. Interface 2 of J1 is grounded, and interface 3 is connected to a 24V power supply. U1 uses the MS1681 chip. This module uses chip U3 to shape, amplify, and output the image signal.

[0066] like Figure 10In the photosensitive detection circuit, JP2's pin 1 is connected to a 12V power supply, pin 2 is grounded, and pin 3 is externally connected to a photoresistor. Internally, it is connected to the base of transistor Q1 via resistor R8. The emitter of Q1 is grounded, and the collector is connected to the TND pin of U7 and resistor R7, with the other end of R7 connected to a 3.3V voltage. This circuit controls the input of the JP12V power supply to the base of Q2 through the photoresistor CDS. The switching state of Q2 changes the current received at TND, thus achieving photosensitive detection and transmitting the information to the control section of U7.

[0067] like Figure 11 The filter switching circuit includes U3, which uses a BA6208L chip; the BIN pin of U3 is connected to the ICR_OFF pin of U7, and is connected to a pull-up resistor and a 3.3V power supply; the AIN pin of U3 is connected to the ICR_ON pin of U7, and is connected to a pull-up resistor and a 3.3V power supply; the VCC pin of U3 is connected to a filter capacitor and a 12V power supply respectively; the AOUT and BOUT pins of U3 are connected to interfaces 1 and 2 of JP1 respectively; the GND pin of U3 is grounded.

[0068] U3 is a single-channel reversible DC motor driver IC. It receives information from U7 through the BIN and AIN pins to realize the forward and reverse rotation of the motor and achieve the action of switching the filter.

[0069] like Figure 12 The current compensation circuit includes transistor Q3. The base of Q3 is connected to the GPIO0 pin of U7 through a resistor and to a 3.3V power supply through a pull-up resistor. The collector of Q3 is connected to the 3.3V power supply. The emitter of Q3 is grounded.

[0070] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A video signal processing circuit switchable between a bright mode and a dark mode, characterized by It includes an image sensor, an image processor, auxiliary circuits, a filter switching circuit, a video output circuit, and a software storage module; The auxiliary circuit includes a power supply circuit, a light detection circuit, a current compensation circuit, and a power supply voltage detection circuit. The image sensor acquires external images and inputs them to the image processor. The image processor processes the image data and outputs it to the video output circuit, where it is amplified and then output. The software storage module connects to the graphics processor and controls the control section of the graphics processor; The power supply circuit receives external voltage, steps it down, and then provides power input to each component; the power supply voltage detection circuit is connected to the image processor; the current compensation circuit is connected to the image processor. The light detection circuit is connected to the image processor to transmit light signals; the image processor is connected to the filter switching circuit to transmit switching signals.

2. The video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The image sensor U2 uses the SC1335 chip. The AVDD pin of this chip is connected to 2.8V, the DOVDD pin is connected to 1.8V, and the DVDD pin is connected to the 1.8V pin. The EXTCLK, PWDNB, SDA, and SCL pins are connected to the image processor. The data output ports D0-D9, PCLK, LREF, and FSYNC pins are connected to the image processor. The VREF2, VREFH, VREFN, and SID pins are grounded.

3. The video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The image processor U7 uses the XC5321A chip, and its pins are divided into a data receiving section, a power supply section, a DAC section, and a control section. In the data receiving section, Y0-Y9 are connected to D0-D9 respectively, the PCLK pin is connected to the corresponding pin of the image sensor, the HREF pin is connected to the LREF pin of U2, the VSYNC pin is connected to the FSYNC pin of U2, the CCLK pin is connected to the EXCLK pin of the image sensor, the SNR_RESET pin is connected to the PWDNB pin of U2, and the I2C_SCK and I2C_SDA pins are connected to the SCL and SDA pins of U2 respectively. In the power supply section, the CVDD pin is connected to 1.1V, VDDIO1 to 1.8V, VDDIO2 to 3.3V, VDDIO3 to 1.8V, the DAC_AVDD pin to 3.3V, and the ground pin to ground. In the DAC section, the DAC_IOUT pin is connected to the video output circuit, the DAC_COMP pin is connected to 3.3V voltage, and the DAC_RESET pin is grounded. In the control section, the SPI_CSN, SPI_SCK, SPI_MOSI, and SPI_MISO pins are connected to the software storage module; the XI and XO pins are connected to the two ends of the crystal oscillator X1; the ICR_OFF and ICR_ON pins are connected to the filter switching circuit; the SETTING_SEL pin is connected to the external input through a pull-up resistor; GPIO0 is connected to the current compensation circuit; the RESETB pin is connected to the power supply voltage detection circuit; the TND pin is connected to the light detection circuit; and the UART_TX is connected to the 3.3V power supply.

4. The video signal processing circuit according to claim 1, wherein The power supply circuit includes a 12V circuit, a 3.3V circuit, a 1.1V circuit, a 2.8V circuit, and a 1.8V circuit; The input terminal of the 12V circuit is connected to a 24V power supply. The 24V power supply is shaped by diode D3 and inductor L6, and after being connected in parallel with filter capacitors C37, C38, and C39, it is connected to the IN and EN pins of U9. The BST pin of U9 is connected to bootstrap capacitor C36. The other end of C36 is connected to the SW pin of U9 and the negative terminal of protection diode D2. The SW pin of U9 is connected to resistor R26, the positive terminal of voltage regulator capacitor C41, and filter capacitor C40 through inductor L7. The other end of R26 is connected to the FB pin of U9 and resistor R30. The other end of R30 is grounded, and the other end of C40 and the negative terminal of C41 are grounded. U9 uses a JW5026 chip. The input terminal of the 3.3V circuit is connected to the 24V power supply output from the negative terminal of D3 in the 12V circuit. After passing through the LC rectifier circuit, it is connected to the IN and EN pins of U8, which is a JW5017S chip. The BST pin of U8 is connected to the bootstrap capacitor C26, and the other end of C26 is connected to the SW pin of U8 and the negative terminal of the protection diode D1. The SW pin of U8 is connected to the resistor R17 and the voltage regulator filter capacitor array through the inductor L5. The other end of R17 is connected to the FB pin of U8 and the resistor R21, and the other end of R21 is grounded. The 2.8V circuit includes chip U4, which uses XC6221B282MR voltage regulator chip. The EN and VIN terminals of U2 are connected in parallel with voltage regulator capacitor C7 to a 3.3V power supply. The output terminal is connected in parallel with voltage regulator capacitor C8 to output a 2.8V voltage. The 1.8V circuit includes chip U5, which uses an XC6206P182MR voltage regulator chip. The VIN terminal of U4 is connected to a 3.3V power supply via a parallel voltage regulator capacitor C16. The output terminal Vout outputs a 1.8V voltage. The 1.1V circuit includes U6, which uses an MT3410L chip. The VIN and SN pins of U6 are connected in parallel with a voltage regulator capacitor C23 to a 3.3V voltage. The SW pin is connected to one end of inductor L2. The other end of L2 is connected to resistor R11, the positive terminal of capacitor C22, C18, C19, C20, and C21, respectively. The other ends of capacitors C18, C19, C20, and C21 and the negative terminal of C22 are grounded. The other end of R11 is connected to the FB pin and resistor R13, respectively. The other end of R13 is grounded.

5. The video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The software storage module includes U11, which uses an M25Q41 chip. The CS pin of U11 is connected to the SPI_CSN pin of U7, the SO pin is connected to the SPI_MISO pin of U7, the SCK pin is connected to the SPI_SCK pin of U7, the SI pin is connected to the SPI_MOSI pin of U7, the WP pin is connected to one end of resistor R29, the other end of R29 is connected to a 3.3V power supply, the VCC pin and the HOLD pin are connected to a 3.3V power supply, and the VSS pin is grounded.

6. The video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The power supply voltage detection circuit includes U10, which uses the HE809 chip. The VCC pin of U10 is connected to a 3.3V power supply, the RESET pin is connected to the RESETB pin of U7, and the GND pin of U9 is grounded.

7. A video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The input terminal of the video output circuit is connected to the DAC_OUT pin of U7. The input terminal of the video output circuit is connected to the IN pin of U1 through an RC circuit. The VCC and PS pins of U1 are connected to a 3.3V power supply. The OUT pin of U1 is connected to interface 1 of external interface J1 through R1. Interface 2 of J1 is grounded, and interface 3 is connected to a 24V power supply. U1 uses an MS1681 chip.

8. A video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, In the light detection circuit, JP2's interface 1 is connected to a 12V power supply, interface 2 is grounded, interface 3 is externally connected to a photoresistor, and internally connected to the base of transistor Q1 through resistor R8. The emitter of Q1 is grounded, and the collector is connected to the TND pin of U7 and resistor R7 respectively. The other end of R7 is connected to a 3.3V voltage.

9. A video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The filter switching circuit includes U3, which uses a BA6208L chip; the BIN pin of U3 is connected to the ICR_OFF pin of U7, and is connected to a pull-up resistor and a 3.3V power supply; the AIN pin of U3 is connected to the ICR_ON pin of U7, and is connected to a pull-up resistor and a 3.3V power supply; the VCC pin of U3 is connected to a filter capacitor and a 12V power supply; the AOUT and BOUT pins of U3 are connected to interfaces 1 and 2 of JP1, respectively; the GND pin of U3 is grounded.

10. A video signal processing circuit with switchable brightness and darkness modes according to claim 1, characterized in that, The current compensation circuit includes a transistor Q3. The base of Q3 is connected to the GPIO0 pin of U7 through a resistor and to a 3.3V power supply through a pull-up resistor. The collector of Q3 is connected to the 3.3V power supply. The emitter of Q3 is grounded.

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