CN111988516A - A control device and control method for a remote wire-controlled camera - Google Patents

Abstract

The embodiment of the application discloses a control device and a control method of a remote line control camera. The device includes: the main control module is used for sending out an adjusting signal; the self-adaptive resistance adjusting module is used for receiving an adjusting signal and adjusting the voltage dividing resistance value of the voltage dividing resistance so as to adjust the control signal; the input/output interface is used for transmitting a control signal to the remote line control camera; and receiving a video signal; the analog video decoding module is used for decoding the video signal to obtain a frame image of the video signal; the main control module is used for judging whether the remote line control camera makes correct response to the control signal according to the frame image of the video signal, and sending an adjusting signal to the self-adaptive resistance adjusting module again when judging that the correct response is not made, so as to adjust the voltage dividing resistance value of the self-adaptive resistance adjusting module. By executing the technical scheme provided by the embodiment, the effect of self-adaptive output of the control signal can be realized for different cameras and cameras connected by cables at different distances.

Description

A control device and control method for a remote wire-controlled camera

technical field

The embodiments of the present application relate to the technical field of signal control, and in particular, to a control device and a control method for a remote wire-controlled camera.

Background technique

With the rapid development of the social economy and the gradual improvement of the level of science and technology, in order to ensure the personal safety and property safety of the general public, the coverage area of video surveillance systems is gradually increasing.

In video surveillance transmission, the market share of analog high definition (CVI, TVI and AHD) cannot be ignored, especially in the transformation of old residential areas, it is compatible with the existing coaxial cable transmission advantages, so it has unique advantages.

The key to simulating high-definition (CVI, TVI and AHD) is image transmission, PTZ control (Pan Tilt Zoom, pan/tilt omnidirectional control, such as up, down, left, right movement and lens zoom, zoom control), and menu selection control ( For example, the movement control and selection control of the frame selection position of the menu on the camera interface, etc.), in the image transmission, due to the adaptive equalization function inside the chip, the transmission distance is very long. However, the control of PTZ is TTL (Transister-Transister-Logic, transistor-transistor logic circuit) level control, the receiving end cannot achieve equalization and other processing, resulting in long-distance transmission, due to cable attenuation, the signal amplitude is too low , resulting in abnormal PTZ control, so that the control function cannot be realized normally; and in a short distance, if the TTL level of the control signal is too large, the level of the receiving end will be too large, causing the level of the receiving pin to be damaged. In addition, the output control voltages of the three mainstream analog high-definition protocols are inconsistent, and PTZ control abnormalities are more likely to occur when devices with different protocols are connected. Therefore, the distance between the PTZ and the camera will affect the correct response of the camera to the control of the high and low potentials of the control signal, and the differences between the cameras will also affect the control of the PTZ.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a control device and a control method for a remote wire-controlled camera, which can achieve the effect of adaptive output of control signals for different cameras and cameras connected by cables at different distances.

In a first aspect, an embodiment of the present application provides a control device for a remote wire-controlled camera, the device comprising:

The main control module is used to send an adjustment signal to the adaptive resistance adjustment module to adjust the voltage dividing resistance value of the adaptive resistance adjustment module;

The adaptive resistance adjustment module is arranged on the control signal circuit, and includes at least two voltage dividing resistors, which are used to receive the adjustment signal sent by the main control module, and according to the adjustment signal, adjust the voltage dividing resistance value of the voltage dividing resistors make adjustments to adjust the control signal;

an input and output interface, used for sending the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through a cable; and receiving the video signal returned by the remote wire-controlled camera;

an analog video decoding module for decoding the video signal to obtain a frame image of the video signal;

The main control module is also used for judging whether the remote wire-controlled camera has made a correct response to the control signal according to the frame image of the video signal, and when judging that the correct response has not been made, it will be sent to the adaptive resistance adjustment module again. Adjust the signal and adjust the voltage divider resistance value of the adaptive resistance adjustment module.

Further, each voltage dividing resistor is provided with an adjustment switch;

After receiving the adjustment signal sent by the main control module, the adaptive resistance adjustment module adjusts the voltage dividing resistance value on the control signal circuit by controlling the on-off of the adjustment switch.

Further, the adjustment switch includes a switch transistor.

Further, the at least two voltage dividing resistors are connected to the control signal circuit in a series and/or parallel manner.

Further, the main control module is also used for:

If all the voltage dividing resistance values of the adaptive resistance adjustment module are traversed, and it is judged that the remote wire-controlled camera has not responded correctly according to the frame image of the video signal, a prompt message that the remote wire-controlled camera cannot be controlled will be issued.

Further, the device further includes a switch control module;

the main control module, configured to send an adjustment instruction to the switch control module;

The switch control module is used for adjusting the voltage dividing resistance value of the adaptive resistance adjusting module by controlling the adjusting switch of the voltage dividing resistor when receiving the adjusting instruction.

In a second aspect, an embodiment of the present application provides a method for controlling a remote wire-controlled camera, the method comprising:

The main control module sends an adjustment signal to the adaptive resistance adjustment module to adjust the voltage dividing resistance value of the adaptive resistance adjustment module;

The adaptive resistance adjustment module receives the adjustment signal sent by the main control module, and adjusts the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal, so as to adjust the control signal; wherein, the adaptive resistance The adjustment module is arranged on the control signal circuit and includes at least two voltage dividing resistors;

an input and output interface, sending the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through a cable; and receiving the video signal returned by the remote wire-controlled camera;

an analog video decoding module, which decodes the video signal to obtain a frame image of the video signal;

The main control module, according to the frame image of the video signal, judges whether the remote wire-controlled camera makes a correct response to the control signal, and when judging that the correct response is not made, sends an adjustment signal to the adaptive resistance adjustment module again, Adjust the voltage divider resistance value of the adaptive resistance adjustment module.

Further, the method also includes:

If all adjustment modes of the adaptive resistance adjustment module are traversed, and it is determined according to the frame image of the video signal that the remote wire-controlled camera has not responded correctly, a prompt message that cannot be adjusted will be sent out.

Further, the control signal includes on-screen menu adjustment.

Further, the control signal is a pulse signal;

The adaptive resistance adjustment module receives the adjustment signal sent by the main control module, and adjusts the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal, so as to increase the high level value of the pulse signal.

The technical solutions provided by the embodiments of the present application include: a main control module, configured to send an adjustment signal to the adaptive resistance adjustment module to adjust the voltage division resistance value of the adaptive resistance adjustment module; the adaptive resistance adjustment module, arranged in the control The signal circuit includes at least two voltage dividing resistors, which are used to receive the adjustment signal sent by the main control module, and adjust the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal to adjust the control signal; input The output interface is used to send the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through the cable; and receive the video signal returned by the remote wire-controlled camera; the analog video decoding module is used to The video signal is decoded to obtain the frame image of the video signal; the main control module is also used to judge whether the remote wire-controlled camera makes a correct response to the control signal according to the frame image of the video signal, and when judging that it has not done so. When a correct response is obtained, an adjustment signal is sent to the adaptive resistance adjustment module again to adjust the voltage dividing resistance value of the adaptive resistance adjustment module. By adopting the technical solutions provided in the present application, the effect of adaptive output of control signals can be achieved for different cameras and cameras connected with cables at different distances.

Description of drawings

Fig. 1 is the control signal output circuit diagram of the PTZ provided by the embodiment of the present application;

2 is an input circuit diagram of a remote wire-controlled camera provided by an embodiment of the present application;

3 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 1 of the present application;

4 is a flowchart of a control method for a remote wire-controlled camera provided in Embodiment 2 of the present application;

5 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 3 of the present application;

6 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 3 of the present application;

FIG. 7 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 3 of the present application.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all the structures related to the present application.

Before discussing the exemplary embodiments in greater detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowchart depicts the steps as a sequential process, many of the steps may be performed in parallel, concurrently, or concurrently. Furthermore, the order of the steps can be rearranged. The process may be terminated when its operation is complete, but may also have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, subroutines, and the like.

In video surveillance transmission, the market share of analog high definition (CVI, TVI and AHD) cannot be ignored, especially in the transformation of old residential areas, it is compatible with the existing coaxial cable transmission advantages, so it has unique advantages.

The key to analog high-definition (CVI, TVI and AHD) is image transmission and PTZ control. There is an adaptive equalization function inside the image transmission chip, so the transmission distance is very long. The control of PTZ is TTL level control, and the receiver does not have equalization and other processing, resulting in long-distance transmission, due to cable attenuation, the signal amplitude is too low, resulting in abnormal PTZ control; and in short distances, the control signal TTL If the level amplitude is too large, the level amplitude of the receiving end will be too large, causing the level of the receiving pin to be damaged. In addition, the output control voltages of the three mainstream analog high-definition protocols are inconsistent, and PTZ control abnormalities are more likely to occur when devices with different protocols are connected. The purpose of this patent is to solve the problem of adaptive matching of PTZ control signals under different protocols. Among them, the wire control signal is a group of control commands, and the NVR/DVR completes the interaction with the front-end camera information through the signal.

The embodiments provided in this application can be used to solve the problems existing in the prior art. FIG. 1 is a circuit diagram of a control signal output circuit of a PTZ provided by an embodiment of the present application. As shown in Figure 1, it is a built-in PTZ fixed-value resistance control scheme, in which PTZOUT_2 is the output pin of the control signal. By setting the resistance values of R31 and R251, they are 75 ohms and 10 ohms respectively. Under the control of the pull-down resistor R5 , the output level value of the control signal can be obtained. In Figure 1, the left side is the control signal output terminal. The control signal can reach the remote wire-controlled camera through the coaxial cable. In general, the control signal of the remote wire-controlled camera is connected to The input end will also be set with a grounded pull-down resistor, and the resistance value is also 75 ohms, which makes the high and low levels of the control signal actually received by the remote wire-controlled camera a fixed value, which cannot achieve the effect of adjusting the output level of the control signal. According to the above data, the level value of the control signal actually received by the remote wire-controlled camera can be exemplarily calculated.

PTZ swing=3.0V*[37.5/(R31+R251+37.5)].

Among them, PTZ swing is the level value of the control signal, and 37.5 ohms is obtained by connecting the two resistance values of the remote wire-controlled camera end and the PTZ end R5 to 75 ohms in parallel.

In addition, FIG. 2 is an input circuit diagram of the remote wire-controlled camera provided by the embodiment of the present application. As shown in Figure 2, after the camera end receives the DVR coaxial control signal input from the rear end, it will be compared with the voltage setting "X" through the comparator. If the level value of the received control signal is greater than X, it is considered that The received is high level, if the received level value is less than X, the received is considered to be low level. It can be seen that if the X set by different remote wire-controlled cameras is different, the recognition of the control signal may be different. At the same time, because the transmission of the coaxial cable has resistance value, when the length of the coaxial cable is long, such as more than 800 meters or more, it may cause a certain attenuation to the level value of the control signal, which will also lead to The control signal cannot be correctly identified.

It can be seen that the prior art has the following shortcomings:

Disadvantage 1:

The front-end camera uses a comparator circuit to process the PTZ wire-controlled signal. If the output signal is higher than a certain value, it will output a high level, otherwise, it will output a low level. As shown in Figure 2, but the CVI, TVI, AHD standard protocols, the voltage setting value of the corresponding comparator "-" pole will be different, resulting in different lengths of coaxial cables, there is a problem that the PTZ wire control cannot be controlled;

Disadvantage 2:

CVI, TVI and AHD protocol video and image signals support a distance of 800 meters or more. In order to achieve the purpose of being visible and controllable, the PTZ control under the three protocols is also compatible with each other, so the level divider of the PTZ control circuit of the DVR It is not suitable to adopt the method of setting the value of resistance.

Example 1

FIG. 3 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 1 of the present application. This embodiment can be adapted to control the remote camera through a cable, and the device can be implemented by software and/or hardware. , and can be integrated into a fully controlled PTZ.

As shown in Figure 3, the control device of the remote wire-controlled camera includes:

The main control module 310 is configured to send an adjustment signal to the adaptive resistance adjustment module 320 to adjust the voltage dividing resistance value of the adaptive resistance adjustment module;

The adaptive resistance adjustment module 320 is arranged on the control signal circuit, and includes at least two voltage dividing resistors 321, which are used to receive the adjustment signal sent by the main control module, and divide the voltage dividing resistance 321 according to the adjustment signal. The piezoresistive value is adjusted to adjust the control signal;

The input and output interface 330 is used to send the control signal adjusted by the adaptive resistance adjustment module 320 to the remote wire-controlled camera through a cable; and receive the video signal returned by the remote wire-controlled camera;

an analog video decoding module 340, configured to decode the video signal to obtain a frame image of the video signal;

The main control module 310 is also used to judge whether the remote wire-controlled camera makes a correct response to the control signal according to the frame image of the video signal, and when it is judged that the correct response is not made, to the adaptive resistance adjustment module 320. The adjustment signal is sent out again to adjust the voltage dividing resistance value of the adaptive resistance adjustment module 320 .

Wherein, the main control module can be a control chip, which can be used to send out a control signal and a signal for adjusting the resistance value of the voltage divider, and can also receive the image or video data returned by the remote wire-controlled camera.

In this embodiment, the adaptive resistance adjustment module is arranged at any position on the control signal circuit, as long as the voltage value of the control signal output by the main control module can be changed. The adaptive resistance adjustment module includes at least two voltage dividing resistors, wherein the at least two voltage dividing resistors can be connected to the control signal circuit in a series and/or parallel manner, and can pull up or pull down the control signal on the circuit The effect of the level value. The adaptive resistance adjustment module is configured to receive the adjustment signal sent by the main control module, and adjust the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal, so as to adjust the control signal.

It is worth noting that, in this embodiment, the unadjusted control signal or the default adjusted control signal can be used as the initial control signal. If the control signal cannot get a correct response, the adaptive resistance adjustment module can be adjusted by adjusting the control signal. The voltage divider resistance value, adjust the control signal up or down until the control signal can be correctly responded.

The input and output interface can send the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through the cable, so as to realize the control of the camera, such as zooming, steering and the like. And the input and output interface can also receive the video signal returned by the remote wire-controlled camera. Wherein, the video signal may be information recorded by the remote wire-controlled camera at the far end.

The analog video decoding module can decode the video signal after receiving the video signal to obtain the frame image of the video signal.

The main control module can judge whether the remote wire-controlled camera makes a correct response to the control signal according to the frame image of the video signal, and when it judges that the correct response is not made, it will send an adjustment signal to the adaptive resistance adjustment module again to adjust the Adaptive resistance adjusts the voltage dividing resistance of the module.

Among them, whether the remote control camera has made a correct response can be determined according to the information in the frame image. For example, the aforementioned control signal can be an on-screen menu adjustment signal. For example, if an image of a menu is displayed on the screen, after the platform receives the frame image, the image in the frame can be recognized. If there is an image of the menu, it means that it can Make the correct response. Or you can send the control signal again to let the camera enter a specific menu page, then you can determine whether the camera is in the menu page you actually want to control the camera by identifying whether the two menus are the same or not. make the correct response. In addition, it can also be identified by other methods, such as storing the corresponding control command in the blanking signal in the video signal returned by the remote wire-controlled camera, and then making a decision on whether the control command in the blanking signal is executed. Correct response to determine whether the remote wire-controlled camera can correctly receive the control command. Among them, the blanking signal is for the imaging scanning circuit of the picture tube. The electron beam emitted by the electron gun starts to scan to the right from the upper left corner of the screen (forward travel). Follow the 'zigzag' shape, and finally scan all the lines of a frame image (field progress). The retrace line that appears when the electron beam is retraced in the reverse path will interfere with the image transmitted by the forward path. During this period, a signal must be added to the circuit so that the electron beam cannot be sent out, which prevents the retrace line from being generated. The signal is called the line blanking signal. For example, it is possible to identify whether the rotation control of the camera is performed, which can be realized by identifying the key points of the frame image. You can also control the camera to display the image of number 1 or number 2 on the page after recording a frame, so that when recognizing the frame image, if there is an image of number 1 or number 2, it means that the control signal is obtained. correct response.

In this embodiment, optionally, each voltage dividing resistor is provided with an adjustment switch; after receiving the adjustment signal sent by the main control module, the adaptive resistance adjustment module adjusts the control signal by controlling the on-off of the adjustment switch Voltage divider resistance on the circuit. Wherein, an adjustment switch can be provided for each voltage dividing resistor, and then the on-off of the adjustment switch can be controlled by the adjustment signal to change the voltage dividing resistance value. The advantage of this setting is that the adjustment method of the voltage dividing resistance value of the self-adaptive adjustment module can be simplified, and the simple adjustment logic is adopted, which is beneficial to the realization of this solution.

In this embodiment, optionally, the adjustment switch includes a switch transistor. Wherein, the base of the transistor can be connected to the adjustment signal, so that as long as the voltage value of the adjustment signal is controlled, the on-off of the transistor can be controlled, thereby adjusting the voltage dividing resistance value.

In this embodiment, optionally, the at least two voltage dividing resistors are connected to the control signal circuit in a series and/or parallel manner. Among them, if it is connected in series, the resistance value of the voltage divider can be adjusted from low to high, which can adapt to the distance of the remote wire-controlled camera from near to far, so that the control signal can be accurately identified, and it can also protect the circuit from It is affected because the level value of the control signal is too high. If it is connected in parallel, it is also possible to control the resistance value of the voltage divider from low to high, but it may be that the adjustment signal output each time is to disconnect the switches of the voltage divider resistors one by one.

In this embodiment, optionally, the main control module is further configured to: if all the voltage division resistance values of the adaptive resistance adjustment module are traversed, it is determined according to the frame image of the video signal that the remote wire-controlled camera has not responded correctly , a prompt message indicating that the remote camera cannot be controlled will be sent. Among them, if all the voltage divider resistance values are traversed, and the remote wire-controlled camera cannot be effectively controlled, the uncontrollable prompt information can be output for the staff to discover in time and intervene and deal with it manually. Among them, the uncontrollable may be due to the problem of the cable being too long, or it may be due to the problem of overdrive. Due to the cable process, the level amplitude of the control signal is affected, so that the high level cannot be read correctly. Take it (such as the high level is lower than the voltage setting "X") and continue to increase the resistance of the voltage divider resistor to pull up the high level amplitude of the control signal. If it is pulled up to the highest level, it cannot be A correct response can prompt uncontrollable information. On the other hand, if the level amplitude of the low level is still greater than the voltage setting "X", there may be an overdrive problem. In this way, in the case of traversing all the voltage divider resistance values, if the control cannot be controlled If the signal responds correctly, there will be an overdrive problem. The advantage of this setting is that the remote wire-controlled camera can be controlled in time.

The technical solutions provided by the embodiments of the present application include: a main control module, configured to send an adjustment signal to the adaptive resistance adjustment module to adjust the voltage division resistance value of the adaptive resistance adjustment module; the adaptive resistance adjustment module, arranged in the control The signal circuit includes at least two voltage dividing resistors, which are used to receive the adjustment signal sent by the main control module, and adjust the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal to adjust the control signal; input The output interface is used to send the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through the cable; and receive the video signal returned by the remote wire-controlled camera; the analog video decoding module is used to The video signal is decoded to obtain the frame image of the video signal; the main control module is also used to judge whether the remote wire-controlled camera makes a correct response to the control signal according to the frame image of the video signal, and when judging that it has not done so. When a correct response is obtained, an adjustment signal is sent to the adaptive resistance adjustment module again to adjust the voltage dividing resistance value of the adaptive resistance adjustment module. By adopting the technical solutions provided in the present application, the effect of adaptive output of control signals can be achieved for different cameras and cameras connected with cables at different distances.

On the basis of the above technical solutions, optionally, the device further includes a switch control module; the main control module is used for sending adjustment instructions to the switch control module; the switch control module is used for receiving When the adjustment instruction arrives, the voltage dividing resistance value of the adaptive resistance adjusting module is adjusted by controlling the adjusting switch of the voltage dividing resistor. Among them, if it is necessary to adjust the resistance value of the voltage divider, the main control module only needs to output the adjustment command to the switch control module, and there is a switch control module to specifically control the switch of each voltage divider resistor. The advantage of this setting is that The requirement for the number of pins of the control chip of the main control module can be reduced, as long as there is one pin to output an adjustment command, thereby simplifying the design of the main control module of the PTZ platform.

Embodiment 2

FIG. 4 is a flowchart of a control method for a remote wire-controlled camera provided in Embodiment 2 of the present application. This embodiment may be implemented by the apparatus provided in the embodiment of this application.

As shown in Figure 4, the control method of the remote wire-controlled camera includes:

S410, the main control module sends an adjustment signal to the adaptive resistance adjustment module to adjust the voltage dividing resistance value of the adaptive resistance adjustment module.

S420. The adaptive resistance adjustment module receives the adjustment signal sent by the main control module, and adjusts the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal, so as to adjust the control signal; The resistance adjustment module is arranged on the control signal circuit and includes at least two voltage dividing resistors.

S430. An input and output interface, sending the control signal adjusted by the adaptive resistance adjustment module to a remote wire-controlled camera through a cable; and receiving a video signal returned by the remote wire-controlled camera.

S440. The analog video decoding module decodes the video signal to obtain a frame image of the video signal.

S450. The main control module, according to the frame image of the video signal, judges whether the remote wire-controlled camera has made a correct response to the control signal, and when it is judged that the correct response has not been made, sends an adjustment signal to the adaptive resistance adjustment module again. signal, adjust the voltage divider resistance value of the adaptive resistance adjustment module.

On the basis of the above-mentioned embodiments, this embodiment provides a control method for a remote wire-controlled camera. The advantage of this setting is that it can realize automatic control of control signals for different cameras and cameras connected by cables at different distances. The effect of adapting to the output.

On the basis of the above technical solutions, optionally, the method further includes:

If all adjustment modes of the adaptive resistance adjustment module are traversed, and it is determined according to the frame image of the video signal that the remote wire-controlled camera has not responded correctly, a prompt message that cannot be adjusted will be sent out.

Based on the above technical solutions, optionally, the control signal includes an on-screen menu adjustment signal.

On the basis of the above technical solutions, optionally, the control signal is a pulse signal;

The adaptive resistance adjustment module receives the adjustment signal sent by the main control module, and adjusts the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal, so as to increase the high level value of the pulse signal.

The above method can be executed by the apparatus provided in any embodiment of the present application, and has functional modules and beneficial effects corresponding to the apparatus.

Embodiment 3

In order to enable those skilled in the art to understand the embodiments of the present application more clearly, the present application also provides preferred embodiments.

FIG. 5 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 3 of the present application. As shown in Figure 5, this scheme is the realization of the hardware scheme. The resistor dividers of several gears are set, and the controller (such as CPU) controls the corresponding gating signal to achieve the correct matching of the level amplitude of the corresponding PTZ control circuit. . Specifically, the main control chip can control the on-off of the switching transistors corresponding to R1, R2, and Rn through the resistance condition control terminal, thereby adjusting the size of the voltage dividing resistance. For example, in the initial state, all the switching transistors are in the off state, then the control signal sending module can directly output the level amplitude output by the main control chip to the BNC interface. In response, the switch transistor corresponding to R1 can be turned on, and a control signal can be output. If there is no response, the transistor corresponding to R1 is turned off, and the transistor corresponding to R2 is turned on, and so on. If all Rn is connected, The voltage dividing resistance value at this time is R1+R2+…+Rn. If the remote wire-controlled camera still cannot respond to the control signal, a prompt message that the remote wire-controlled camera cannot be controlled can be sent.

FIG. 6 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 3 of the present application. As shown in Figure 6, an integrated digital potentiometer can be used to replace the voltage divider resistor. The hardware block diagram is shown in Figure 6: Advantages of the scheme: the circuit layout is single, the IO resource requirements of the controller are low, and linear adjustment can be achieved; the scheme is insufficient: Adjustable resistors are expensive and add cost to the design.

FIG. 7 is a schematic diagram of a control device for a remote wire-controlled camera provided in Embodiment 3 of the present application. As shown in Figure 7, the method of building a gating circuit by itself is used to replace the voltage divider resistor. The hardware block diagram is shown in Figure 7: The benefits of the scheme: the IO resource requirements of the controller are low, and linear adjustment can be achieved, which is more efficient than the digital potentiometer scheme. Flexible; insufficient solution: it will increase the cost of the design, which is more complicated than the design of the digital potentiometer.

This embodiment solves the following problems in the current PTZ control circuit:

1. Solve the problem that the DVR can automatically adapt to the appropriate PTZ level voltage under the high-definition analog (CVI, TVI and AHD) cameras that adapt to different protocols, so as to ensure the driveability of the PTZ control of devices with different protocols;

2. Solve the problem caused by the large difference in the length of the coaxial cable during the wiring process, so that the camera can normally identify the wire control signal sent by the DVR when the PTZ control cable is the longest or the shortest;

3. Solve the cost of wire control and make the circuit cost the lowest.

Note that the above are only preferred embodiments of the present application and applied technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present application. The scope is determined by the scope of the appended claims.

Claims (10)

1. A control device for a remote wire-controlled camera, characterized in that, comprising: The main control module is used to send an adjustment signal to the adaptive resistance adjustment module to adjust the voltage dividing resistance value of the adaptive resistance adjustment module; The adaptive resistance adjustment module is arranged on the control signal circuit, and includes at least two voltage dividing resistors, which are used to receive the adjustment signal sent by the main control module, and according to the adjustment signal, adjust the voltage dividing resistance value of the voltage dividing resistors make adjustments to adjust the control signal; an input and output interface, used for sending the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through a cable; and receiving the video signal returned by the remote wire-controlled camera; an analog video decoding module for decoding the video signal to obtain a frame image of the video signal; The main control module is also used for judging whether the remote wire-controlled camera has made a correct response to the control signal according to the frame image of the video signal, and when judging that the correct response has not been made, it will be sent to the adaptive resistance adjustment module again. Adjust the signal and adjust the voltage divider resistance value of the adaptive resistance adjustment module. 2. The device according to claim 1, wherein each voltage dividing resistor is provided with an adjustment switch; After receiving the adjustment signal sent by the main control module, the adaptive resistance adjustment module adjusts the voltage dividing resistance value on the control signal circuit by controlling the on-off of the adjustment switch. 3. The apparatus of claim 2, wherein the adjustment switch comprises a switching transistor. 4 . The device according to claim 2 , wherein the at least two voltage dividing resistors are connected to the control signal circuit in a series and/or parallel manner. 5 . 5. The device according to claim 1, wherein the main control module is also used for: If all the voltage dividing resistance values of the adaptive resistance adjustment module are traversed, and it is judged that the remote wire-controlled camera has not responded correctly according to the frame image of the video signal, a prompt message that the remote wire-controlled camera cannot be controlled will be issued. 6. The device according to claim 1, wherein the device further comprises a switch control module; the main control module, configured to send an adjustment instruction to the switch control module; The switch control module is used for adjusting the voltage dividing resistance value of the adaptive resistance adjusting module by controlling the adjusting switch of the voltage dividing resistor when receiving the adjusting instruction. 7. A control method for a remote wire-controlled camera, comprising: The main control module sends an adjustment signal to the adaptive resistance adjustment module to adjust the voltage dividing resistance value of the adaptive resistance adjustment module; The adaptive resistance adjustment module receives the adjustment signal sent by the main control module, and adjusts the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal to adjust the control signal; wherein, the adaptive resistance adjustment The module is arranged on the control signal circuit and includes at least two voltage dividing resistors; an input and output interface, sending the control signal adjusted by the adaptive resistance adjustment module to the remote wire-controlled camera through a cable; and receiving the video signal returned by the remote wire-controlled camera; an analog video decoding module, which decodes the video signal to obtain a frame image of the video signal; The main control module, according to the frame image of the video signal, judges whether the remote wire-controlled camera makes a correct response to the control signal, and when judging that the correct response is not made, sends an adjustment signal to the adaptive resistance adjustment module again, Adjust the voltage divider resistance value of the adaptive resistance adjustment module. 8. The method according to claim 7, wherein the method further comprises: If all the adjustment modes of the adaptive resistance adjustment module are traversed, and it is determined according to the frame image of the video signal that the remote wire-controlled camera has not responded correctly, a prompt message that cannot be adjusted will be sent out. 9. The method of claim 7, wherein the control signal comprises an on-screen menu adjustment signal. 10. The method according to claim 7, wherein the control signal is a pulse signal; The adaptive resistance adjustment module receives the adjustment signal sent by the main control module, and adjusts the voltage dividing resistance value of the voltage dividing resistor according to the adjustment signal, so as to increase the high level value of the pulse signal.

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