CN110996011A - Multi-camera synchronous triggering system - Google Patents
Multi-camera synchronous triggering system Download PDFInfo
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- CN110996011A CN110996011A CN201911328398.0A CN201911328398A CN110996011A CN 110996011 A CN110996011 A CN 110996011A CN 201911328398 A CN201911328398 A CN 201911328398A CN 110996011 A CN110996011 A CN 110996011A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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Abstract
The invention discloses a multi-camera synchronous triggering system which comprises a plurality of synchronous triggering modules, wherein each synchronous triggering module is connected with a camera to be triggered; the synchronous trigger module comprises a main control chip, a communication module and a trigger module, and the communication module and the trigger module are respectively connected with the main control chip; the communication module receives a command data packet sent by the upper computer and transmits the command data packet to the main control chip, and the main control chip analyzes the command data packet and judges whether to send a trigger signal to the trigger module according to the analyzed command data; the trigger module is connected with the camera, and when the trigger module receives a trigger signal, the trigger module triggers the camera to start to acquire images; according to the technical scheme, any plurality of cameras can be synchronously triggered, the scheduling of an operating system is not needed, the time delay is avoided, the real-time performance is high, two trigger channels of a network broadcast trigger mode and an RS485 trigger mode are designed, and the flexibility of the system is improved; the invention can be suitable for the camera with the network interface and can be compatible with the camera without the network interface.
Description
Technical Field
The invention relates to the field of communication, in particular to a multi-camera synchronous triggering system.
Background
In the field of machine vision detection, an application scenario that all cameras or a plurality of specified cameras in a system trigger photographing at the same time is required, and the prior art mainly adopts the following modes:
1. the soft triggering mode is that the upper computer software sends triggering commands to each camera one by one, and because the software triggering commands of each camera are executed in time sequence and are influenced by uncertainty of scheduling of an operating system, the delay difference of each camera receiving the triggering commands reaches dozens of milliseconds, and the requirement of synchronous triggering shooting of the system is difficult to meet;
2. in the hard triggering mode, each camera is respectively connected with a triggering signal line to a triggering signal source, and when a plurality of cameras which need to be triggered simultaneously exist in the system, the cost and the complexity of the system are greatly increased;
3. the technical scheme is only directed to interface cameras with network communication, the industrial cameras have various interface standards, if the industrial cameras are not network interface cameras, a network needs to be specially paved for triggering, and additional equipment support is needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-camera synchronous triggering system, the technical scheme of the invention can synchronously trigger any plurality of cameras, does not need operation system scheduling, does not have time delay, does not need a uniform triggering signal source, can be realized by only one broadcast instruction, and overcomes the defect that the existing synchronous triggering method can only trigger all the cameras of the system.
Therefore, the technical scheme of the invention is as follows:
a multi-camera synchronous triggering system comprises a plurality of synchronous triggering modules, wherein each synchronous triggering module is connected with a camera to be triggered; the synchronous trigger module comprises a main control chip, a communication module and a trigger module, and the communication module and the trigger module are respectively connected with the main control chip; the communication module receives a command data packet sent by the upper computer and transmits the command data packet to the main control chip, and the main control chip analyzes the command data packet and judges whether to send a trigger signal to the trigger module according to the analyzed command data; the trigger module is connected with the camera, and when the trigger module receives the trigger signal, the camera is triggered to start to collect images.
Furthermore, each synchronous trigger module is correspondingly provided with a unique code, and the code is stored in a storage module connected with the main control chip.
Further, the communication module comprises a network communication module and/or an RS485 communication module.
Further, the upper computer sends out an instruction data packet in a broadcasting mode, and the instruction data packet is received and analyzed by the synchronous trigger modules at the same time; the instruction packet includes: frame header, address information, data length, function code, data block and check code.
Further, the data block includes N bytes of binary bits,
represents the smallest integer greater than the quotient;
sequencing the binary bits, wherein the sequenced serial numbers correspond to the codes of the synchronous trigger modules one by one;
the single synchronous trigger module searches for a binary bit consistent with the storage number of the single synchronous trigger module, and the main control chip judges whether to start the trigger module according to the numerical value state of the binary bit.
And further, partial cameras can be triggered to be started, and camera triggering in multiple modes can be carried out.
In order to improve the transmission stability, a retransmission mechanism is set, and further, the synchronous trigger module sends a response signal to the upper computer through the communication module when receiving the instruction data packet each time;
and if the upper computer does not receive the response signal within the specified time T, the command data packet is sent again, the sending frequency of the same command data packet is less than or equal to three times, and T is 50 ms-200 ms.
Specifically, the function code is provided with a sequence number, where the sequence number is used to indicate the number of times the same instruction packet is transmitted, and the initial sequence number is 1, and is +1 for each transmission; when the sequence number is larger than 3, the sending is prompted to fail and the network transmission environment is unstable;
preferably, the camera further comprises a light source module, the light source module is connected with the trigger module, and when the light source module is started with the trigger module, the light source module is started to illuminate the camera.
Preferably, the RS485 communication modules of the plurality of synchronous trigger modules are connected to the 485 bus in a cascading mode; the 485 bus is connected with the communication converter, the communication converter is communicated with the upper computer, and the instruction data packet sent by the upper computer is converted into a 485 communication instruction data packet and broadcasted to each synchronous trigger module.
Further, the communication converter comprises a 485 concentrator, a repeater and a 485 communication network card.
Furthermore, the network communication modules of the plurality of synchronous trigger modules are respectively connected to the network equipment; the network equipment communicates with the upper computer and broadcasts the instruction data packet sent by the upper computer to each synchronous trigger module.
Further, the network device is a switch or a network card.
The technical scheme of the invention can synchronously trigger any plurality of cameras, does not need operating system scheduling, does not have time delay, does not need a uniform trigger signal source, and can be realized only by one broadcast instruction, thereby overcoming the defect that the prior synchronous triggering method can only trigger all the cameras of the system.
An RS485 synchronous triggering mode is added on the basis of a network broadcast triggering mode, namely two triggering channels are provided, and the flexibility of the system is improved; the invention can be suitable for the camera with the network interface and can be compatible with the camera without the network interface.
The scheme adopts a bus topological structure, and enables a plurality of cameras to be connected to a bus communication signal line in a cascading manner, so that the wiring scheme of the system is simplified, and the cost is reduced; the scheme also has the advantages of large mounting quantity of cameras and long signal transmission distance.
Drawings
FIG. 1 is a schematic diagram of a multi-camera synchronous triggering module according to an embodiment;
FIG. 2 is a schematic diagram of the embodiment in which a synchronous trigger module is connected to an upper computer by a bus;
fig. 3 is a schematic diagram of a synchronization triggering process in the embodiment.
Detailed Description
The technical scheme of the invention is described in detail with reference to the accompanying drawings and the specific embodiments.
A multi-camera synchronous triggering system is shown in fig. 1 and comprises a plurality of synchronous triggering modules, wherein each synchronous triggering module is connected with a camera to be triggered; the synchronous trigger module comprises a main control chip, a communication module and a trigger module, and the communication module and the trigger module are respectively connected with the main control chip; the communication module receives a command data packet sent by the upper computer and transmits the command data packet to the main control chip, and the main control chip analyzes the command data packet and judges whether to send a trigger signal to the trigger module according to the analyzed command data; the trigger module is connected with the camera, and when the trigger module receives a trigger signal (GPIO signal), the trigger module triggers the camera to start to acquire images.
In order to realize the triggering of any plurality of cameras, a unique code is correspondingly set for each synchronous triggering module, and the code is stored in a storage module connected with a main control chip.
The communication module comprises a network communication module (a network interface RJ45+ a switch chip) and/or an RS485 communication module (an RS485 interface + an RS485 chip);
the upper computer sends out an instruction data packet in a broadcasting mode, and the synchronous trigger modules receive and analyze the instruction data packet at the same time; the instruction packet includes: frame header, address information, data length, functional code, data block and check code;
wherein the data block comprises N bytes of binary bits,
represents the smallest integer greater than the quotient;
sequencing the binary bits, wherein the sequenced serial numbers correspond to the codes of the synchronous trigger modules one by one;
as shown in fig. 3, a single synchronous trigger module searches for a binary bit with a same storage number as the single synchronous trigger module, and the main control chip determines whether to start the trigger module according to the value state of the binary bit.
And further, partial cameras can be triggered to be started, and camera triggering in multiple modes can be carried out.
For example:
if there are 20 cameras in the system
Then 3 byte binary numbers need to be sent (000010011000011001011011):
triggering all cameras with binary numbers of 1, namely triggering the cameras connected with synchronous triggering modules with serial numbers of 20, 17, 16, 11, 10, 7, 5, 4, 2 and 1;
(II) if the system has 15 cameras in common
Then a 2 byte binary number needs to be sent (0100011001011011):
triggering all cameras with binary numbers of 1, namely triggering the cameras connected with synchronous triggering modules with serial numbers of 15, 11, 10, 7, 5, 4, 2 and 1;
setting the frame header as AA, the address as FE, the frame length as 2 bytes, setting the address information as coding FE, transmitting the command to each trigger module in the system, realizing the broadcast function;
when the synchronous trigger module receives an order with an AA frame header, the synchronous trigger module starts to receive the order, when the order length reaches the frame length (2 bytes), the data is moved to the verification part, if the last two verification codes of the order are incorrect, the synchronous trigger module will respond the error report information to the computer, if the last two verification codes of the order are correct, the synchronous trigger module enters the order extraction part to obtain the number information needing to be triggered.
In order to improve the transmission stability, a retransmission mechanism is set, and specifically, the synchronous trigger module sends a response signal to the upper computer through the communication module every time the synchronous trigger module receives an instruction data packet;
and if the upper computer does not receive the response signal within the specified time T, the command data packet is sent again, the sending frequency of the same command data packet is less than or equal to three times, and T is 50 ms-200 ms.
Specifically, the function code is provided with a sequence number, where the sequence number is used to indicate the number of times the same instruction packet is transmitted, and the initial sequence number is 1, and is +1 for each transmission; when the sequence number is larger than 3, the sending is prompted to fail and the network transmission environment is unstable;
in this embodiment, the camera further includes a light source module, the light source module is connected to the trigger module, and when the trigger module is turned on, the light source module is turned on to illuminate the camera.
For flexibility of information transmission, as an embodiment of the invention, the communication module comprises a network communication module and an RS485 communication module;
as shown in fig. 2, RS485 communication modules of a plurality of synchronous trigger modules are connected to a 485 bus in a cascade connection manner, and the 485 bus adopts a bus-type topology structure; in the figure, A, B refers to the terminals of two RS485 communication lines, and the A, B terminals of a plurality of RS485 devices are correspondingly connected; the 485 bus is connected with the communication converter, the communication converter is communicated with the upper computer, and the instruction data packet sent by the upper computer is converted into a 485 communication instruction data packet and broadcasted to each synchronous trigger module. The communication converter can be set as a 485 concentrator, a repeater and a 485 communication network card.
The network communication modules of the synchronous trigger modules are respectively connected to network equipment; the network equipment communicates with the upper computer, and broadcasts the instruction data packet sent by the upper computer to each synchronous trigger module.
The network device is a switch or a network card.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (10)
1. A multi-camera synchronous triggering system is characterized by comprising a plurality of synchronous triggering modules, wherein each synchronous triggering module is connected with a camera to be triggered; the synchronous trigger module comprises a main control chip, a communication module and a trigger module, and the communication module and the trigger module are respectively connected with the main control chip; the communication module receives a command data packet sent by the upper computer and transmits the command data packet to the main control chip, and the main control chip analyzes the command data packet and judges whether to send a trigger signal to the trigger module according to the analyzed command data; the trigger module is connected with the camera, and when the trigger module receives the trigger signal, the camera is triggered to start to collect images.
2. The multi-camera synchronous triggering system of claim 1, wherein: and each synchronous trigger module is correspondingly provided with a unique code, and the code is stored in a storage module connected with the main control chip.
3. The multi-camera synchronous triggering system of claim 1, wherein: the communication module comprises a network communication module and/or an RS485 communication module.
4. A multi-camera synchronous triggering system as claimed in claim 2 or 3, wherein: the upper computer sends out an instruction data packet in a broadcasting mode, and the instruction data packet is received and analyzed by the synchronous trigger modules at the same time; the instruction packet includes: frame header, address information, data length, function code, data block and check code.
5. The multi-camera synchronous triggering system of claim 4, wherein: the data block comprises N bytes of binary bits,
indicating a minimum integer greater than the quotientCounting;
sequencing the binary bits, wherein the sequenced serial numbers correspond to the codes of the synchronous trigger modules one by one;
the single synchronous trigger module searches for a binary bit consistent with the storage number of the single synchronous trigger module, and the main control chip judges whether to start the trigger module according to the numerical value state of the binary bit.
6. The multi-camera synchronous triggering system of claim 1, wherein: the synchronous trigger module sends a response signal to the upper computer through the communication module every time the synchronous trigger module receives an instruction data packet;
and if the upper computer does not receive the response signal within the specified time T, the command data packet is sent again, the sending frequency of the same command data packet is less than or equal to three times, and T is 50 ms-200 ms.
7. The multi-camera synchronous triggering system of claim 1, wherein: the camera further comprises a light source module, the light source module is connected with the trigger module, and when the light source module is started with the trigger module, the light source module is started to illuminate the camera.
8. The multi-camera synchronous triggering system of claim 3, wherein: RS485 communication modules of the synchronous trigger modules are connected to a 485 bus in a cascading mode; the 485 bus is connected with the communication converter, the communication converter is communicated with the upper computer, and the instruction data packet sent by the upper computer is converted into a 485 communication instruction data packet and broadcasted to each synchronous trigger module.
9. The multi-camera synchronous triggering system of claim 8, wherein: the communication converter comprises a 485 concentrator, a repeater and a 485 communication network card.
10. The multi-camera synchronous triggering system of claim 3, wherein: the network communication modules of the synchronous trigger modules are respectively connected to network equipment; the network equipment communicates with the upper computer and broadcasts the instruction data packet sent by the upper computer to each synchronous trigger module; the network equipment is a switch or a network card.
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| CN201911328398.0A CN110996011A (en) | 2019-12-20 | 2019-12-20 | Multi-camera synchronous triggering system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112654124A (en) * | 2020-12-30 | 2021-04-13 | 广东奥普特科技股份有限公司 | Light source controller with real-time synchronous trigger output or warning output and method thereof |
| CN114401355A (en) * | 2022-01-04 | 2022-04-26 | 安徽国钜工程机械科技有限公司 | Integrated trigger device of industrial camera array |
| CN114554037A (en) * | 2020-11-26 | 2022-05-27 | 华为技术有限公司 | Data transmission method and electronic equipment |
| WO2023280206A1 (en) * | 2021-07-08 | 2023-01-12 | Zhejiang Huaray Technology Co., Ltd. | Systems and methods for camera synchronization |
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