Control method and system for a photoacoustic warning camera

Abstract

The embodiment of the application provides a control method and system of an acousto-optic warning camera, when the acousto-optic warning camera alarms, a warning light is turned on in a non-exposure time of an image sensor and is turned off in an exposure time, a warning sound is turned on in the exposure time of the image sensor and is turned off in the non-exposure time. The problems that the acousto-optic warning works simultaneously to cause high transient power consumption of the camera, the camera restarts and there are rolling stripes under centralized power supply of the coaxial high-definition camera are solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of camera monitoring, and in particular, to a control method and system of an audible and visual warning camera. BACKGROUND

[0002] The current audible and visual warning camera generally triggers a buzzer or a speaker to issue a warning sound and triggers a warning light to flash when triggering an alarm, so as to achieve audible and visual warning. However, the simultaneous work of audible and visual warning will cause the transient power consumption of the camera to be too high, which will cause the camera to restart under long-distance power supply, or the coaxial high-definition camera to have a rolling stripe under centralized power supply due to the large current fluctuation of the camera. SUMMARY

[0003] Embodiments of the present application provide a control method and system of an audible and visual warning camera to at least solve the problem that the simultaneous work of audible and visual warning in the related art causes the transient power consumption of the camera to be too high, the camera to restart, and the coaxial high-definition camera to have a rolling stripe under centralized power supply.

[0004] According to an embodiment of the present application, a control method of an audible and visual warning camera is provided, the audible and visual warning camera comprising an image sensor, a warning light and a warning sound, when the audible and visual warning camera alarms, the warning light is turned on in the non-exposure time of the image sensor and is turned off in the exposure time, and the warning sound is turned on in the exposure time of the image sensor and is turned off in the non-exposure time.

[0005] In an exemplary embodiment, the opening and closing of the warning light and the warning sound are controlled by a frame synchronization signal output by the image sensor.

[0006] In an exemplary embodiment, the opening and closing of the warning light are controlled by the frame synchronization signal output by the image sensor, which comprises: in the non-exposure time, the frame synchronization signal output is high level, the input of the driving chip of the warning light is high level, and the warning light is turned on; in the exposure time, the frame synchronization signal output is low level, the input of the driving chip of the warning light is low level, and the warning light is turned off.

[0007] In an exemplary embodiment, the opening and closing of the warning sound are controlled by the frame synchronization signal output by the image sensor, which comprises: in the non-exposure time, the frame synchronization signal output is high level, the input of the driving chip of the warning sound is low level, and the warning sound is turned off; in the exposure time, the frame synchronization signal output is low level, the input of the driving chip of the warning sound is high level, and the warning sound is turned on.

[0008] In one example embodiment, further comprising: controlling a rising edge of the frame synchronization signal to align with an end of exposure of a last row of a previous frame, and controlling a falling edge of the frame synchronization signal to align with a start of exposure of a first row of a current frame.

[0009] In one example embodiment, the controlling the rising edge of the frame synchronization signal to align with the end of exposure of the last row of the previous frame, and the controlling the falling edge of the frame synchronization signal to align with the start of exposure of the first row of the current frame, comprises: configuring the frame synchronization signal of the image sensor such that the rising edge of the frame synchronization signal aligns with the end of exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal aligns with the start of exposure of the first row of the current frame; or, obtaining, by a control unit, a non-exposure time and an exposure time of the image sensor, the non-exposure time as a duration of a high level of the frame synchronization signal, and the exposure time as a duration of a low level of the frame synchronization signal.

[0010] In one example embodiment, the turning-on power of the warning light and the turning-on power of the warning sound are the same.

[0011] According to another embodiment of the present application, there is also provided a control system of an audible and visual warning camera, the audible and visual warning camera comprising an image sensor, a warning light and a warning sound, the control system further comprising: a signal synchronization unit and a signal inversion unit, wherein an input end of the signal synchronization unit is connected to an output end of the image sensor, an output end of the signal synchronization unit is connected to a driving chip of the warning light, an input end of the signal inversion unit is connected to an output end of the signal synchronization unit, and an output end of the signal inversion unit is connected to a driving chip of the warning sound.

[0012] In one example embodiment, the signal synchronization unit comprises a tri-state gate circuit, wherein an enable control end of the tri-state gate circuit is connected to a master control chip of the audible and visual warning camera, an input end of the tri-state gate circuit is connected to the output end of the image sensor, and an output end of the tri-state gate circuit is connected to the driving chip of the warning light; or, the signal synchronization unit comprises an AND gate circuit, wherein an input end of the AND gate circuit is connected to the output end of the image sensor, and an output end of the AND gate circuit is connected to the driving chip of the warning light.

[0013] In one example embodiment, the signal inversion unit comprises a tri-state gate circuit or an inverter.

[0014] The application provides a control method and system of an acoustic-optical warning camera. When the acoustic-optical warning camera alarms, the warning light is turned on during the non-exposure time of the image sensor and turned off during the exposure time, and the warning sound is turned on during the exposure time of the image sensor and turned off during the non-exposure time. The problem that the transient power consumption of the camera is too high due to the simultaneous work of the acoustic-optical warning, the camera restarts and there are rolling stripes under the centralized power supply of the coaxial high-definition camera is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a flow chart of the control method of the acoustic-optical warning camera according to an embodiment of the application;

[0016] Figure 2 is a flow chart of the control method of the acoustic-optical warning camera according to an embodiment of the application;

[0017] Figure 3 is a structural block diagram of the control system of the acoustic-optical warning camera according to an embodiment of the application;

[0018] Figure 4 is a structural block diagram of the control system of the acoustic-optical warning camera according to an embodiment of the application;

[0019] Figure 5 is a schematic diagram of the sensor and warning light driving synchronization principle according to an embodiment of the application;

[0020] Figure 6 is a schematic diagram of the sensor and warning light driving synchronization principle according to an embodiment of the application;

[0021] Figure 7 is a structural block diagram of the control system of the acoustic-optical warning camera according to an embodiment of the application;

[0022] Figure 8 is a circuit schematic diagram of the control system of the acoustic-optical warning camera according to an embodiment of the application. DETAILED DESCRIPTION

[0023] Hereinafter, the embodiments of the application will be described in detail with reference to the accompanying drawings and in combination with the embodiments.

[0024] According to an embodiment of the application, a control method of an acoustic-optical warning camera is provided, wherein the acoustic-optical warning camera comprises an image sensor, a warning light and a warning sound, and when the acoustic-optical warning camera alarms, the warning light is turned on during the non-exposure time of the image sensor and turned off during the exposure time, and the warning sound is turned on during the exposure time of the image sensor and turned off during the non-exposure time.

[0025] In one exemplary embodiment, Figure 1 is a flow chart of the control method of the acoustic-optical warning camera according to an embodiment of the application, asFigure 1 As shown in the figure, the flow includes the following steps:

[0026] Step S102, the opening and closing of the warning light and the warning sound are controlled by the frame synchronization signal output by the image sensor.

[0027] In an example embodiment, the opening and closing of the warning light and the warning sound are controlled by the frame synchronization signal output by the image sensor, including two cases, respectively:

[0028] For the warning light, during the non-exposure time, the frame synchronization signal output is high level, the input of the driving chip of the warning light is high level, and the warning light is on; during the exposure time, the frame synchronization signal output is low level, the input of the driving chip of the warning light is low level, and the warning light is off.

[0029] For the warning sound, during the non-exposure time, the frame synchronization signal output is high level, the input of the driving chip of the warning sound is low level, and the warning sound is off; during the exposure time, the frame synchronization signal output is low level, the input of the driving chip of the warning sound is high level, and the warning sound is on.

[0030] In an example embodiment, Figure 2 is a flow chart of the control method of the acousto-optic warning camera according to an embodiment of the application, as Figure 2 shown in the figure, the flow includes the following steps:

[0031] Step S202, the opening and closing of the warning light and the warning sound are controlled by the frame synchronization signal output by the image sensor.

[0032] Step S204, the rising edge of the frame synchronization signal is aligned with the end of the exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal is aligned with the start of the exposure of the first row of the current frame.

[0033] The execution order of step S202 and step S204 can be interchanged, that is, step S204 is executed first, and then step S202 is executed.

[0034] In an example embodiment, the rising edge of the frame synchronization signal is aligned with the end of the exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal is aligned with the start of the exposure of the first row of the current frame, including two implementation modes: configuring the frame synchronization signal of the image sensor, so that the rising edge of the frame synchronization signal is aligned with the end of the exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal is aligned with the start of the exposure of the first row of the current frame. Alternatively, the control unit is used to calculate the non-exposure time and the exposure time of the image sensor, and the non-exposure time is used as the duration of the high level of the frame synchronization signal, and the exposure time is used as the duration of the low level of the frame synchronization signal.

[0035] In the embodiment of the present application, the control unit can be a micro control unit (MCU) or a complex programmable logic device (CPLD).

[0036] In the embodiment of the present application, the rising edge of the frame synchronization signal can be aligned with the end of exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal can be aligned with the start of exposure of the first row of the current frame.

[0037] In an exemplary embodiment, the opening power of the warning light is the same as the opening power of the warning sound.

[0038] In the embodiment of the present application, the opening power of the warning light is not strictly the same as the opening power of the warning sound. As long as the power of the warning light during the non-exposure time is approximately the same as the power of the warning sound during the exposure time, the power consumption in one frame of the sensor can be ensured to be the same. Furthermore, when the camera triggers the alarm, the power consumption of the entire camera during the working of the warning light and the warning sound will not fluctuate greatly, thereby solving the problems of power-down restart of the camera under long-line power supply and rolling stripes of the coaxial high-definition analog sound and light warning camera under centralized power supply.

[0039] According to another embodiment of the present application, a control system of a sound and light warning camera is provided. Figure 3 FIG. 3 is a structural block diagram of the control system of the sound and light warning camera according to the embodiment of the present application. Figure 3 As shown in FIG. 3, the control system 30 of the sound and light warning camera includes a signal synchronization unit 310 and a signal inversion unit 320. The input end of the signal synchronization unit 310 is connected with the output end of the image sensor of the sound and light warning camera, the output end of the signal synchronization unit 310 is connected with the driving chip of the warning light, the input end of the signal inversion unit 320 is connected with the output end of the signal synchronization unit, and the output end of the signal inversion unit 320 is connected with the driving chip of the warning sound.

[0040] In an exemplary embodiment, the signal synchronization unit 310 includes a tri-state gate circuit or an AND gate circuit. When the signal synchronization unit includes the tri-state gate circuit, the enable control end of the tri-state gate circuit is connected with the main control chip of the sound and light warning camera, the input end of the tri-state gate circuit is connected with the output end of the image sensor, and the output end of the tri-state gate circuit is connected with the driving chip of the warning light. Alternatively, when the signal synchronization unit includes the AND gate circuit, the input end of the AND gate circuit is connected with the output end of the image sensor, and the output end of the AND gate circuit is connected with the driving chip of the warning light.

[0041] In an exemplary embodiment, the signal inversion unit 320 includes a tri-state gate circuit or an inverter.

[0042] In the embodiments of the present application, the specific structure type and form of the signal synchronization unit and the signal inversion unit are not limited, that is, the signal synchronization unit can be a tristate gate or an AND gate. The signal inversion unit can be a NOT gate or an inverter. Specifically, different implementation forms are adopted, and the actual circuit structure is adjusted accordingly, as long as the function of the sound and light warning camera control system provided by the present application can be realized.

[0043] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and a necessary general hardware platform, and of course, it can also be realized by hardware, but in many cases, the latter is a better embodiment.

[0044] Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present application can be realized by a general computing device, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and they can be realized by program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific hardware and software combination.

[0045] In order for those skilled in the art to better understand the technical solutions of the present application, the following will be described in conjunction with specific scene embodiments.

[0046] Scene Embodiment One

[0047] The existing sound and light warning camera generally controls the image output through external synchronization control EFSYNC by a main control chip, and determines the image frame rate output, and controls the warning light drive at the same frame rate to ensure that the sensor (Sensor) exposure is synchronized with the warning light drive. The main control chip resources need to be consumed to synchronize the Sensor exposure and the warning light, and part of the main control chip resources is not enough to realize this function.

[0048] The present application mainly makes the warning sound and the warning light work in time, turns on the warning light in the non-exposure time (blanking time) of the sensor, and turns on the warning sound in the exposure time, so as to ensure that it is continuous in one frame time of the Sensor, that is, it can ensure that the warning light does not affect the image flicker when the camera triggers the alarm, and can avoid the power consumption superposition and current fluctuation after the warning sound is turned on, and solves the problems of camera power failure restart under long line power supply and rolling stripes of coaxial high-definition analog camera under centralized power supply.

[0049] Figure 4is a structure block diagram of a control system of an acousto-optic warning camera according to the scene embodiment of the present application, as shown in the figure, Figure 4 The tri-state gate and the inverter are used in the scene embodiment.

[0050] In the scene embodiment, the frame synchronization signal controls the warning sound to be turned on after passing through the inverter (or the NOT gate). That is, the warning light is turned on in the non-exposure time of the Sensor (the blanking time), and the warning sound is turned on in the exposure time, so as to ensure the continuity of the warning light and the warning sound in each frame time, and keep the power of the warning light and the warning sound consistent as far as possible to avoid the frequent fluctuation of the current of the camera during the warning, thereby solving the problems of power-down restart of the acousto-optic warning camera under long-line power supply and the rolling stripes of the high-definition analog acousto-optic warning camera under centralized power supply.

[0051] When the acousto-optic warning camera works normally, the main control chip provides the main clock (MCLK) to the Sensor, and the Sensor outputs the RAW DATA to the main control chip for processing and then outputs the image information. When the acousto-optic warning camera is in the alarm mode, the main control chip outputs the low level to the control tri-state gate OE#, and the Sensor outputs the frame synchronization signal FSYNC to the input end of the tri-state gate, and the output of the tri-state gate is connected to the input of the warning light driving chip EN and the NOT gate (or the inverter).

[0052] In order to prevent the warning light from flickering and affecting the exposure of the Sensor, the warning light is defined to flicker in the non-exposure time (the blanking time) of the Sensor in one frame time. It is necessary to solve the synchronization of the Sensor exposure and the warning light driving, and at the same time, it is necessary to meet the non-exposure time (the blanking time) existing in the image valid row output during the CMOS exposure process.

[0053] In order to synchronize the Sensor exposure and the warning light driving, it is necessary to configure the Sensor in the active mode and output the FSYNC signal, and the edge of the signal is synchronized with the exposure process, that is, the rising edge and the falling edge can be configured to align with the start or end of the exposure of a certain row. Figure 5 is a schematic diagram of the synchronization principle of the Sensor and the warning light driving according to the scene embodiment of the present application.

[0054] In order to make the non-exposure time (the blanking time) exist in the image valid row output during the CMOS Sensor exposure process, taking the 1080P@25fps exposure process as an example, the time sequence relationship between the FSYNC signal and the exposure is further explained. The high level of the FSYNC is the non-exposure time, Figure 6 is a schematic diagram of the synchronization principle of the Sensor and the warning light driving according to the scene embodiment of the present application, as shown in the figure, Figure 6As shown. According to the COMS exposure principle, the exposure start time of ROW(n) to the exposure start time of ROW(n-1) =△t =1 / (fps*VTS). VTS is the maximum total row number of Sensor output, under the condition of constant fps, increasing VTS can reduce△t, so that the effective image row appears during the exposure process. The actual pixels of a certain Sensor are 1080P, according to its performance configuration, the internal exposure and transmission clock to VTS =2880 (size depends on the performance of Sensor), then the exposure row interval△t =1 / (25*2880) =13.9us, assuming that the exposure start time of ROW1 =0, the exposure start time of the last row of effective row ROW1080 = (1080-1)*△t =1079*13.9us≈15ms. Then under this configuration, when the exposure is set to less than 25ms, each effective row is in the blanking time; when the exposure is set to 20ms, there is 5ms of blanking time, and the warning light flashes in the 5ms and does not affect the image.

[0055] According to Figure 6 It can be seen that, in the case of Sensor configuration, that is, the rising and falling edges of the output FSYNC signal of Sensor are required to be configurable, and the rising edge of FSYNC is required to be configured to align with the last row of T-1 frame effective exposure end, and the falling edge is required to be configured to align with the exposure start of the first row of T frame. Adjusting the amplitude of FSYNC signal can meet the EN of warning light driving chip.

[0056] Scenario embodiment two

[0057] The present scenario embodiment gives another way of synchronizing Sensor and warning light driving. When the output FSYNC pulse width of Sensor cannot be adjusted, this part of Sensor can only output FSYNC to align with the exposure start of a certain row, and the specific blanking time needs to be calculated by MCU or CPLD.

[0058] Figure 7 The structure block diagram of the control system of the acousto-optic warning camera according to the scenario embodiment of the present application is shown in Figure 7 As shown, in the present scenario embodiment, a tri-state gate and an inverter are used, and the non-exposure time and exposure time are obtained by calculating the delay time by MCU or CPLD.

[0059] When the acousto-optic warning camera triggers the warning, the high level of the frame synchronization signal FSYNC output by Sensor is set as the non-exposure time. When the frame synchronization signal FSYNC is at low level, the output driving warning sound power amplifier is output through the inverter, and the low level duration is the effective exposure time of Sensor.

[0060] Therefore, in the case that the power of the non-exposure time warning light of the Sensor is approximately the same as the power of the exposure time warning sound, the same power consumption in one frame of the Sensor can be ensured. Furthermore, when the camera triggers an alarm, the power consumption of the entire camera does not fluctuate greatly when the warning light and the warning sound work, and the problems of power-down restart of the camera under long-line power supply and rolling stripes of the coaxial high-definition analog sound and light warning camera under centralized power supply are solved.

[0061] Scene Embodiment Three

[0062] The actual example of the scene gives a more specific circuit structure. Figure 8 is a circuit schematic diagram of the control system of the sound and light warning camera according to the scene embodiment of the present application, as shown in Figure 8 U1 is a tri-state gate, U2 is a NOT gate, U3 is a warning light driving chip, and U4 is a warning sound power amplifier chip. U3 and U4 are high-enabled. In the normal working mode of the sound and light camera, the main control GPIO outputs a high level, that is, the OE# input of U1 is a high level. At this time, no matter whether the output frame synchronization signal (FSYNC) of the Sensor is a high level or a low level, the output of U1 is a high resistance, and R1 and R2 pull down to ensure that U3 and U4 are closed, and the sound and light camera only outputs an image signal. When the sound and light warning camera triggers an alarm, the GPIO outputs a low level, that is, the OE# input of U1 is a low level. At this time, when the output frame synchronization signal (FSYNC) of the Sensor is a high level, that is, the input of U1 is a high level, the output Y pin of U1 is a high level, enabling the warning light driving chip and allowing the warning light to work. When the output of U1 is a high level, the output after the U2 NOT gate is a low level, and at this time, the warning sound power amplifier does not work. When the output frame synchronization signal of the Sensor is a low level, the output of U1 is a low level, at this time, the warning light driving does not work, and the output after the U2 NOT gate is a high level to drive the warning sound power amplifier to work.

[0063] In the scene embodiment, U1 uses a tri-state gate instead of an AND gate, mainly considering that the delay is smaller. The above application is only an application example. The NOT gate of U2 can also be replaced by a tri-state gate, and the above functions can also be achieved by appropriately adjusting the circuit, which is not illustrated one by one.

[0064] In summary, the application provides a control method and system of an acoustic-optical warning camera, wherein the acoustic-optical warning camera opens the warning light in the non-exposure time of the Sensor and opens the warning sound in the effective exposure time of the Sensor. The synchronization of the warning light driving and the power amplifier of the warning sound uses the frame synchronization output of the Sensor, the main control chip is not used to control the Sensor exposure and the warning light driving to be synchronized, and the resources of the main control chip are reduced. The power consumption of the warning light opening and the power consumption of the warning sound opening are approximately the same, so that the power consumption of the Sensor does not fluctuate greatly within one frame time when triggering the alarm, that is, the power supply does not drop when triggering the alarm under long-line power supply, and there are no rolling stripes under the centralized power supply of the coaxial high-definition analog acoustic-optical warning camera.

[0065] The above only describes the preferred embodiments of the application and is not used to limit the application. The application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the principles of the application shall be included in the protection scope of the application.

Claims

1. A control method of an acoustic and light warning video camera, the acoustic and light warning video camera comprising an image sensor, a warning light and a warning sound, characterized in that, The image sensor is line-by-line exposure; When the sound-light warning camera alarms, the opening and closing of the warning light and the warning sound are controlled by the frame synchronization signal output by the image sensor, including: the warning light is turned on during the non-exposure time of the image sensor and turned off during the exposure time by controlling the frame synchronization signal; the warning sound is turned on during the exposure time of the image sensor and turned off during the non-exposure time by controlling the frame synchronization signal; wherein the non-exposure time is the time interval between the end of the exposure of the last row of the previous frame and the start of the exposure of the first row of the current frame, and the non-exposure time is a non-zero time interval obtained by increasing the maximum total row number VTS of the image sensor while keeping the frame rate of the image sensor unchanged; The rising edge of the frame synchronization signal is aligned with the end of the exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal is aligned with the start of the exposure of the first row of the current frame.

2. The method of claim 1, wherein, The opening and closing of the warning light and the warning sound are controlled by the frame synchronization signal output by the image sensor, including: During the non-exposure time, the frame synchronization signal output is high, the input of the driving chip of the warning light is high, and the warning light is turned on; During the exposure time, the frame synchronization signal output is low, the input of the driving chip of the warning light is low, and the warning light is turned off.

3. The method of claim 1, wherein, The opening and closing of the warning light and the warning sound are controlled by the frame synchronization signal output by the image sensor, including: During the non-exposure time, the frame synchronization signal output is high, the input of the driving chip of the warning light is high, and the warning light is turned on; During the exposure time, the frame synchronization signal output is low, the input of the driving chip of the warning light is low, and the warning light is turned off.

4. The method of claim 1, wherein, The rising edge of the frame synchronization signal is aligned with the end of the exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal is aligned with the start of the exposure of the first row of the current frame. The frame synchronization signal of the image sensor is configured so that the rising edge of the frame synchronization signal is aligned with the end of the exposure of the last row of the previous frame, and the falling edge of the frame synchronization signal is aligned with the start of the exposure of the first row of the current frame; Or, the non-exposure time and the exposure time of the image sensor are obtained by a control unit, the non-exposure time is the duration of the high level of the frame synchronization signal, and the exposure time is the duration of the low level of the frame synchronization signal.

5. The method of claim 1, wherein, The opening power of the warning light and the opening power of the warning sound are the same.

6. A control system for an audible and visual alert camera, the audible and visual alert camera comprising an image sensor, an alert light and an alert sound, characterized in that, Further comprising: a signal synchronization unit and a signal inversion unit, wherein the input end of the signal synchronization unit is connected with the output end of the image sensor, the output end of the signal synchronization unit is connected with the driving chip of the warning light, the input end of the signal inversion unit is connected with the output end of the signal synchronization unit, and the output end of the signal inversion unit is connected with the driving chip of the warning sound; The sound-light warning camera is configured to control the opening and closing of the warning light and the warning sound through a frame synchronization signal output by the image sensor when the sound-light warning camera alarms, including: controlling the warning light to be turned on during the non-exposure time of the image sensor and turned off during the exposure time through the frame synchronization signal; and controlling the warning sound to be turned on during the exposure time of the image sensor and turned off during the non-exposure time through the frame synchronization signal; wherein the non-exposure time is a time interval between the end of the exposure of the last row of the previous frame and the start of the exposure of the first row of the current frame, and the non-exposure time is a non-zero time interval obtained by increasing the maximum total row number VTS of the image sensor while keeping the image sensor frame rate unchanged; The sound-light warning camera is further configured to control the rising edge of the frame synchronization signal to be aligned with the end of the exposure of the last row of the previous frame, and control the falling edge of the frame synchronization signal to be aligned with the start of the exposure of the first row of the current frame.

7. The system of claim 6, wherein, The signal synchronization unit includes a tri-state gate circuit, wherein the enable control end of the tri-state gate circuit is connected with the main control chip of the sound-light warning camera, the input end of the tri-state gate circuit is connected with the output end of the image sensor, and the output end of the tri-state gate circuit is connected with the driving chip of the warning light. Alternatively, the signal synchronization unit includes an AND gate circuit, wherein the input end of the AND gate circuit is connected with the output end of the image sensor, and the output end of the AND gate circuit is connected with the driving chip of the warning light.

8. The system of claim 6, wherein, The signal inversion unit includes a tri-state gate circuit or an inverter.

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