Vehicle-mounted camera circuit supporting dual-interface transmission and vehicle-mounted terminal system

Abstract

A vehicle-mounted camera circuit and a vehicle-mounted terminal system supporting dual-interface transmission comprise an image sensor and are characterized by further comprising an image processing circuit, an analog separator, an impedance matching circuit and a signal conversion circuit. The image processing circuit is connected with the image sensor so as to process a video signal output by the image sensor; the analog shunt is connected with the output end of the image processing circuit so as to divide the processed video signal output by the image processing circuit into a first AHD signal and a second AHD signal and output the first AHD signal and the second AHD signal; the impedance matching circuit performs impedance matching on the first AHD signal to output an analog video; the signal conversion circuit performs analog-to-digital conversion and processing on the second AHD signal to output a digital video. According to the camera, the analog video and the digital video of the camera can be separated, the digital interface host and the analog interface host can be accessed at the same time, the cost is reduced, and the adaptation flexibility is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted cameras, and particularly to a vehicle-mounted camera circuit and a vehicle terminal system that support dual-interface transmission. Background Art

[0002] Cameras are increasingly widely used in vehicles, and have gradually transitioned from analog cameras to high-definition cameras. Analog cameras generally use CVBS or AHD for transmission, while high-definition vehicle-mounted cameras generally use LVDS for transmission. In the market, there are more and more terminal devices for receiving camera video signals in vehicles, including dash cams, in-vehicle infotainment systems, 360-degree surround view hosts, ADAS controllers, etc. At present, due to different interfaces, some vehicle-mounted terminals install multiple cameras for the same application, resulting in increased costs. Summary of the Invention

[0003] The main object of the present invention is to overcome the defect that the vehicle-mounted terminal in the prior art needs to install multiple cameras due to different camera interfaces, resulting in increased costs. The present invention proposes a vehicle-mounted camera circuit and a vehicle terminal system that support dual-interface transmission, which realizes the separation of analog video and digital video of the camera, and achieves the reuse of connecting to multiple hosts with different transmission interfaces, thereby reducing costs and improving the flexibility of adaptation.

[0004] The present invention adopts the following technical solutions:

[0005] A vehicle-mounted camera circuit that supports dual-interface transmission includes an image sensor, and is characterized in that: it further includes an image processing circuit, an analog separator, an impedance matching circuit, and a signal conversion circuit; the image processing circuit is connected to the image sensor to process the video signal output by the image sensor; the analog splitter is connected to the output end of the image processing circuit to divide the processed video signal output by the image processing circuit into a first AHD signal and a second AHD signal for output; the impedance matching circuit performs impedance matching on the first AHD signal to output analog video; the signal conversion circuit performs analog-to-digital conversion and processing on the second AHD signal to output digital video.

[0006] Further, the image processing circuit performs linear correction, noise removal, dead pixel removal, interpolation, white balance, and automatic exposure control on the video signal output by the image sensor.

[0007] Further, the analog separator includes a video drive amplification unit, a first capacitor, a second capacitor, a first resistor, and a second resistor; one end of the first resistor is connected to the output end of the image processing circuit, and the other end is connected to one end of the second resistor, one end of the first capacitor, and one end of the second capacitor, and the other end of the second resistor is grounded; the video drive amplification unit is connected to the other end of the first capacitor to drive and amplify the video signal to output the first AHD signal; the other end of the second capacitor outputs the second AHD signal.

[0008] Further, the signal conversion circuit includes an analog-to-digital conversion unit and a serializer. The analog-to-digital conversion unit converts the second AHD signal into digital video, and the serializer is connected to the analog-to-digital conversion unit to convert the parallel digital video into serial video data.

[0009] Further, the impedance matching circuit includes a matching resistor, a field effect transistor, a first Schottky diode, a second Schottky diode, a third resistor, a third capacitor, and a fourth capacitor; one end of the third capacitor is connected to the output end of the analog separator, and the other end is connected to one end of the matching resistor. The other end of the matching resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to the drain of the field effect transistor and one end of the second Schottky diode. The gate of the field effect transistor is connected to VCC, and the source of the field effect transistor is connected to the matching output end; one end of the first Schottky diode is connected to the source of the field effect transistor, and the other end is grounded.

[0010] Further, the impedance matching circuit further includes a TVS diode. One end of the TVS diode is connected to the output end of the analog splitter, and the other end is grounded.

[0011] Further, it further includes a coaxial RF connector and a power conversion and management unit. The coaxial RF connector is connected to the output end of the signal conversion circuit; the power conversion and management unit is connected to the signal conversion circuit, the coaxial RF connector, and the image sensor.

[0012] Further, it further includes a connector. The connector is connected to the matching output end of the impedance matching circuit.

[0013] Further, it further includes a Flash. The Flash is connected to the image processing circuit to store the firmware and parameter configuration information required for image processing.

[0014] A vehicle-mounted terminal system includes at least a first vehicle-mounted terminal and a second vehicle-mounted terminal, and is characterized in that: it further includes the above-mentioned vehicle-mounted camera circuit supporting dual-interface transmission. The first vehicle-mounted terminal is connected to the impedance matching circuit to receive analog signals, and the second vehicle-mounted terminal is connected to the signal conversion circuit to receive digital video.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, an image processing circuit, an analog separator, an impedance matching circuit, a signal conversion circuit, etc. are provided, which can realize the separation of analog video and digital video of the camera, and can be connected to a digital interface host and an analog interface host at the same time, that is, it reduces the cost and improves the flexibility of adaptation.

[0017] 2. In the present invention, the analog separator includes a video drive amplification unit, a first capacitor, a second capacitor, a first resistor, a second resistor, etc., which are used to separate the video signal into a first AHD signal and a second AHD signal; the impedance matching circuit includes a matching resistor, a field effect transistor, a first Schottky diode, a second Schottky diode, a third resistor, a third capacitor, and a fourth capacitor, etc., to ensure the normal transmission of the AHD signal and realize terminal resistance matching; the signal conversion circuit includes an analog-to-digital conversion unit and a serializer to convert the second AHD signal into digital video and serial video data.

[0018] 3. In the vehicle-mounted system of the present invention, two vehicle-mounted terminals can share a camera circuit, reducing the number of cameras in the system, reducing costs, and facilitating product application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a circuit diagram of the connection between the present invention and a vehicle-mounted terminal;

[0020] Figure 2 It is a circuit diagram of the impedance matching circuit and the analog separation circuit;

[0021] Figure 3 It is a circuit diagram of the impedance matching circuit;

[0022] Wherein:

[0023] 10. Image sensor, 20. Image processing circuit, 30. Analog separator, 40. Impedance matching circuit, 50. Signal conversion circuit, 51. Analog-to-digital conversion unit, 52. Serializer, 60. First vehicle-mounted terminal, 61. Analog-to-digital converter, 62. First SOC chip, 70. Second vehicle-mounted terminal, 71. Deserializer, 72. Second SOC chip, 80. Power conversion and management unit

[0024] The following further details the present invention in conjunction with the drawings and specific embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following further describes the present invention through specific embodiments.

[0026] In the present invention, for terms such as "first", "second", "third", etc., they are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be construed as indicating or implying relative importance. In the description, the orientation or positional relationship indicated by "up", "down", "left", "right", "front" and "back" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the protection scope of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In addition, in the description of this application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0028] See Figure 1 , a vehicle-mounted camera circuit supporting dual-interface transmission, including an image sensor 10, an image processing circuit 20, an analog separator 30, an impedance matching circuit 40, a signal conversion circuit 50, etc. The image sensor 10 is a device for converting an optical image into an electrical signal. The image processing circuit 20 is connected to the image sensor 10 to process the video signal output by the image sensor 10; the analog splitter is connected to the output end of the image processing circuit 20 to divide the processed video signal output by the image processing circuit 20 into a first AHD signal and a second AHD signal for output; the impedance matching circuit 40 performs impedance matching on the first AHD signal to output an analog video; the signal conversion circuit 50 performs analog-to-digital conversion and processing on the second AHD signal to output a digital video.

[0029] Among them, the image processing circuit 20 performs linear correction, noise removal, dead pixel removal, interpolation, white balance and automatic exposure control on the video signal output by the image sensor 10. Through the image processing circuit 20, the on-site details can be better restored under different optical conditions.

[0030] See Figure 2, the analog separator 30 is used to separate the video signal into two AHD signals, and it includes a video driving and amplifying unit, a first capacitor C1502, a second capacitor C1503, a first resistor R1502, and a second resistor R1503, etc. One end of the first resistor R1502 is connected to the output end of the image processing circuit 20, and the other end is connected to one end of the second resistor C1503, one end of the first capacitor C1502, and one end of the second capacitor C1503. The other end of the second resistor R1503 is grounded; the video driving and amplifying unit is connected to the other end of the first capacitor C1502 to drive and amplify the video signal to output the first AHD signal; the other end of the second capacitor C1503 outputs the second AHD signal. The video driving and amplifying unit uses a video driving and amplifying chip U1500, whose VIN pin is connected to the first capacitor C1502, and the VOUT pin is the output end to be connected to the impedance matching circuit 40. The video driving and amplifying unit enhances the details and brightness of the image by amplifying the voltage or current of the video signal, and will not interfere with the video output.

[0031] The signal conversion circuit 50 includes an analog-to-digital conversion unit 51 and a serializer 52. The analog-to-digital conversion unit 51 converts the second AHD signal into digital video, and the serializer 52 is connected to the analog-to-digital conversion unit 51 to convert the parallel digital video into serial video data.

[0032] See Figure 3 , to achieve the normal transmission of the AHD analog signal and realize the termination resistor matching, the impedance matching circuit 40 includes a matching resistor R1504, a field effect transistor Q1502, a first Schottky diode D1500, a second Schottky diode D1501, a third capacitor C1508, and a fourth capacitor C1505; one end of the third capacitor C1508 is connected to the output end of the analog separator 30 and serves as the matching input terminal MS1637_O, and the other end is connected to one end of the matching resistor R1504. The other end of the matching resistor R1504 is connected to one end of the fourth capacitor C1505. The other end of the fourth capacitor C1505 is connected to the drain of the field effect transistor Q1502 and one end of the second Schottky diode D1501. The other end of the second Schottky diode D1501 is grounded. The gate of the field effect transistor Q1502 is connected to VCC, and the source of the field effect transistor Q1502 is connected to the matching output terminal MS1637_OUT; one end of the first Schottky diode D1500 is connected to the source of the field effect transistor Q1502, and the other end is grounded. Among them, the matching resistor R1504 can be impedance-matched at 75 ohms. The field effect transistor Q1502 is used to prevent damage caused by the input of a large voltage circuit, and the first Schottky diode D1500 is used to prevent static electricity.

[0033] Furthermore, the impedance matching circuit 40 further includes a TVS diode. One end of the TVS diode is connected to the output end of the analog shunt, and the other end is grounded. The TVS diode is used to achieve fast overvoltage protection for circuit components.Figure 3 In it, the component NC between the matching output terminal MS1637_OUT and the capacitor C1505 is a reserved part, which can adopt F5100 and is optional.

[0034] The present invention further includes a coaxial radio frequency connector and a power conversion and management unit 80. The coaxial radio frequency connector is connected to the output terminal of the signal conversion circuit 50, and this coaxial radio frequency connector can be used to connect to a vehicle-mounted terminal. The power conversion and management unit 80 is connected to the signal conversion circuit 50, the coaxial radio frequency connector, and the image sensor 10. The vehicle-mounted terminal can transmit the supply voltage in the POC manner, and the power conversion and management unit 80 is used to convert the supply voltage from the vehicle-mounted terminal to supply power to the image sensor 10, etc., reducing the harness cost.

[0035] Furthermore, it also includes a connector and a Flash. The connector is connected to the matching output terminal of the impedance matching circuit 40, and the connector can also be used to connect to a vehicle-mounted terminal. The Flash is connected to the image processing circuit 20 to store the firmware and parameter configuration information required for image processing.

[0036] Based on this, the present invention further proposes a vehicle-mounted terminal system, which at least includes a first vehicle-mounted terminal 60, a second vehicle-mounted terminal 70 circuit, and the above-mentioned vehicle-mounted camera circuit supporting dual-interface transmission. Refer to Figure 1 , the vehicle-mounted camera circuit can be connected to the first vehicle-mounted terminal 60 and the second vehicle-mounted terminal at the same time. The first vehicle-mounted terminal 60 is provided with a connector, an analog-to-digital converter 61, and a first SOC chip 62. It receives the analog video through the connector connected to the connector of the camera circuit, and the analog-to-digital converter 61 performs analog-to-digital conversion on the analog video and then sends it to the first SOC chip 62 for decoding.

[0037] The second vehicle-mounted terminal 70 is provided with a coaxial radio frequency connector, a deserialization circuit 71, and a second SOC chip 72. It is connected to the coaxial radio frequency connector of the camera circuit through the coaxial radio frequency connector to transmit serial video data. The deserialization circuit 71 is used to convert the serial video data sent by the serializer 52 in the circuit of the present invention into parallel video data and provide it to the second SOC chip 72 for decoding.

[0038] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A vehicle-mounted camera circuit supporting dual-interface transmission, including an image sensor, characterized in that: it further includes an image processing circuit, an analog splitter, an impedance matching circuit and a signal conversion circuit; the image processing circuit is connected to the image sensor to process the video signal output by the image sensor; the analog splitter is connected to the output end of the image processing circuit to divide the processed video signal output by the image processing circuit into a first AHD signal and a second AHD signal for output; the impedance matching circuit performs impedance matching on the first AHD signal to output an analog video; the signal conversion circuit performs analog-to-digital conversion and processing on the second AHD signal to output a digital video.

2. The vehicle-mounted camera circuit supporting dual-interface transmission according to claim 1, characterized in that: the image processing circuit performs linear correction, noise removal, dead pixel removal, interpolation, white balance and automatic exposure control on the video signal output by the image sensor.

3. The vehicle-mounted camera circuit supporting dual-interface transmission according to claim 1, characterized in that: the analog splitter includes a video driver amplification unit, a first capacitor, a second capacitor, a first resistor and a second resistor; one end of the first resistor is connected to the output end of the image processing circuit, and the other end is connected to one end of the second resistor, one end of the first capacitor and one end of the second capacitor, and the other end of the second resistor is grounded; the video driver amplification unit is connected to the other end of the first capacitor to drive and amplify the video signal to output the first AHD signal; the other end of the second capacitor outputs the second AHD signal.

4. The vehicle-mounted camera circuit supporting dual-interface transmission according to claim 1, characterized in that: the signal conversion circuit includes an analog-to-digital conversion unit and a serializer, the analog-to-digital conversion unit converts the second AHD signal into a digital video, and the serializer is connected to the analog-to-digital conversion unit to convert the parallel digital video into serial video data.

5. The vehicle-mounted camera circuit supporting dual-interface transmission according to claim 1, characterized in that: the impedance matching circuit includes a matching resistor, a field effect transistor, a first Schottky diode, a second Schottky diode, a third resistor, a third capacitor and a fourth capacitor; one end of the third capacitor is connected to the output end of the analog splitter, and the other end is connected to one end of the matching resistor, the other end of the matching resistor is connected to one end of the fourth capacitor, the other end of the fourth capacitor is connected to the drain of the field effect transistor and one end of the second Schottky diode, the gate of the field effect transistor is connected to VCC, and the source of the field effect transistor is connected to the matching output end; one end of the first Schottky diode is connected to the source of the field effect transistor, and the other end is grounded.

6. The vehicle-mounted camera circuit supporting dual-interface transmission according to claim 5, characterized in that: the impedance matching circuit further includes a TVS diode, one end of the TVS diode is connected to the output end of the analog splitter, and the other end is grounded.

7. The vehicle-mounted camera circuit supporting dual-interface transmission according to claim 1, It is characterized in that: It further includes a coaxial RF connector and a power conversion and management unit. The coaxial RF connector is connected to the output end of the signal conversion circuit; the power conversion and management unit is connected to the signal conversion circuit, the coaxial RF connector and the image sensor.

8. An in-vehicle camera circuit supporting dual-interface transmission according to claim 1, It is characterized in that: It further includes a connector, and the connector is connected to the matching output end of the impedance matching circuit.

9. An in-vehicle camera circuit supporting dual-interface transmission according to claim 1, It is characterized in that: It further includes a Flash, and the Flash is connected to the image processing circuit to store the firmware and parameter configuration information required for image processing.

10. An in-vehicle terminal system, at least including a first in-vehicle terminal and a second in-vehicle terminal, It is characterized in that: It further includes an in-vehicle camera circuit supporting dual-interface transmission according to any one of claims 1 to 9. The first in-vehicle terminal is connected to the impedance matching circuit to receive analog signals, and the second in-vehicle terminal is connected to the signal conversion circuit to receive digital video.

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