CN107645627B - Multi-camera synchronous control device - Google Patents
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- CN107645627B CN107645627B CN201610576846.9A CN201610576846A CN107645627B CN 107645627 B CN107645627 B CN 107645627B CN 201610576846 A CN201610576846 A CN 201610576846A CN 107645627 B CN107645627 B CN 107645627B
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Abstract
The invention belongs to the technical field of machine vision, and discloses a multi-camera synchronous control device, which specifically comprises: the device comprises a processing module, an encoder signal input module, a triggering module, a parameter signal input module and a synchronous control module, wherein the encoder signal input module is connected with the processing module and is used for sending an encoding signal generated by an encoder to the processing module; the trigger module is connected with the processing module and is used for sending a trigger signal to the processing module; the parameter signal input module is connected with the processing module and is used for sending the device parameter setting signal to the processing module; and the synchronous control module is connected with the processing module and is used for outputting the synchronous control signal generated by the processing module to each camera, so that the synchronous control of each camera is realized, and simultaneously, the line frequency of the line scanning camera can be adjusted by modifying the parameter setting signal.
Description
Technical Field
The invention belongs to the technical field of machine vision, and particularly relates to a multi-camera synchronous control device.
Background
In the application of online detection of the surface quality of the printed matter, for the printed matter with large width, a single camera view field cannot cover the whole detection area, and a plurality of cameras are needed to carry out image splicing, so that the visual detection of the surface quality of the printed matter with large width is completed. In the printing process, a plurality of cameras are required to acquire images simultaneously, and the quality detection task is completed through image splicing and algorithm processing. Otherwise, the moment of image shooting of each camera is inconsistent, the acquired images are images of the printed matter in different states, and difficulty is brought to image splicing and detection algorithms.
At present, the multi-purpose line scanning camera for detecting the surface quality of printed matters has a plurality of forms such as gigabit network, Camera Link and the like, can realize image data transmission with a computer, but cannot control a plurality of line scanning cameras to simultaneously acquire through computer software. Meanwhile, a single encoder can only be fixedly connected to a single line scanning camera, cannot be connected to a plurality of line scanning cameras simultaneously, is fixed in acquisition frequency, and cannot change the line frequency of the line scanning cameras in an external trigger mode.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a multi-camera synchronous control device, which effectively solves the technical problem that a single encoder cannot simultaneously control synchronous acquisition of a plurality of cameras.
The technical scheme provided by the invention is as follows:
a multi-camera synchronization control apparatus comprising:
a processing module, an encoder signal input module, a triggering module, a parameter signal input module and a synchronous control module, wherein,
the encoder signal input module is connected with the processing module and is used for sending an encoding signal generated by an encoder to the processing module;
the trigger module is connected with the processing module and is used for sending a trigger signal to the processing module;
the parameter signal input module is connected with the processing module and is used for sending a device parameter setting signal to the processing module;
and the synchronous control module is connected with the processing module and is used for outputting the synchronous control signal generated by the processing module to each camera so as to realize synchronous control of each camera.
Further preferably, the triggering module is connected with the processing module through a first optical coupling and isolation module.
Further preferably, the synchronization control module includes a plurality of synchronization control units, each of the synchronization control units is connected to the processing module, and the number of the synchronization control units matches the number of the cameras.
Further preferably, the parameter signal input module is connected to the processing module through a second optical coupling isolation module, and the second optical coupling isolation module includes an input isolation unit and an output isolation unit.
Further preferably, the multi-camera synchronization control device further comprises a communication module connected with the processing module, and the processing module is in communication connection with the outside through the communication module.
Further preferably, the multi-camera synchronization control device further comprises a storage module connected to the processing module, and the storage module is used for storing device parameter setting signals and realizing power-down retention of the multi-camera synchronization control device.
Further preferably, the multi-camera synchronous control device further comprises a clock module connected with the processing module, and the clock module is used for providing a working clock for the multi-camera synchronous control device and providing a control time sequence for multi-camera synchronous acquisition.
The multi-camera synchronous control device provided by the invention has the beneficial effects that:
in the multi-camera synchronous control device provided by the invention, synchronous control signals are comprehensively formed by combining analysis processing of the processing module based on received trigger signals, coding signals, device parameter setting signals and the like according to device parameter setting signals input by the detection system through the parameter signal input module, and are respectively output to a plurality of camera acquisition cards, so that synchronous control of a plurality of cameras is realized. In addition, the line frequency of the line scanning camera can be adjusted by modifying the parameter setting signal, and the device is simple and convenient to use.
Drawings
Fig. 1 is a hardware block diagram of an embodiment of a multi-camera synchronization control device provided by the present invention;
fig. 2 is a hardware block diagram of another embodiment of the multi-camera synchronization control device provided by the invention;
fig. 3 is a hardware block diagram of another embodiment of the multi-camera synchronization control device provided by the invention;
fig. 4 is a flowchart illustrating the operation of the processing module in the multi-camera synchronization control apparatus according to the present invention.
Reference numerals:
100-multi-camera synchronous control device, 110-processing module, 120-encoder signal input module, 130-trigger module, 140-parameter signal input module, 150-synchronous control module, 160-communication module, 170-storage module and 180-clock module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the specific details of the present invention described below are merely illustrative of the present invention and are not to be construed as limiting the present invention. Any modifications and variations that come within the teachings of the invention as described are within the scope of the invention.
Fig. 1 is a hardware block diagram of an embodiment of a multi-camera synchronization control apparatus 100 provided in the present invention, and as can be seen from the diagram, the multi-camera synchronization control apparatus includes: the processing module 110, the encoder signal input module 120, the trigger module 130, the parameter signal input module 140, and the synchronization control module 150, wherein the encoder signal input module, the trigger module, the parameter signal input module, and the synchronization control module are respectively connected to the processing module. In the working process, the encoder signal input module sends the encoding signal generated by the encoder to the processing module; the trigger module sends the trigger signal to the processing module; the parameter signal input module sends the device parameter setting signal to the processing module; and then, the processing module analyzes and processes the received device parameter setting signal, the coding signal and the triggering signal to form a synchronous control signal, and the synchronous control signal is output to a camera acquisition card of each camera through the synchronous control module to realize the synchronous control of each camera.
Specifically, in this embodiment, the processing module is implemented by an FPGA (Field Programmable gate array) chip, and as a core device of the entire synchronous control device, the auxiliary parameter signal input module is in communication connection with a computer on which the camera acquisition card is installed, and the auxiliary synchronous control module is in communication connection with an external encoder. The FPGA is programmed to output synchronous control signals and variable frequency signals of the cameras, control over a plurality of cameras at the same time is achieved, and the function of changing the line frequency of the cameras in an external trigger mode is achieved. In one embodiment, the FPGA chip with the model number of 10M08SAE144 is selected to realize the purpose of the invention.
The trigger module is a trigger switch, and a trigger signal sent by the trigger switch is connected with the processing module through an optical coupling isolation module (the first optical coupling isolation module). The parameter signal input module is connected with the processing module through a second optical coupling isolation module, and specifically the second optical coupling isolation module comprises an input isolation circuit and an output isolation circuit, so that signal interaction between the multi-camera synchronous control device and an external detection system, such as start-stop control, image coding, fault alarm and the like, is realized. The encoder signal input module is connected with an external encoder through a D-SUB9 interface, and is particularly connected with the processing module through a differential output circuit with the model number of 26LS 31.
The synchronous control module comprises a plurality of synchronous control units, each synchronous control unit is connected with the processing module, and the number of the synchronous control units is matched with the number of the cameras. In a specific embodiment, the synchronous control unit is a differential output circuit, and the synchronous control module includes four differential output circuits with a model number of 26LS31, so as to implement synchronous acquisition of four cameras.
As shown in fig. 2, the multi-camera synchronization control device of the present embodiment further includes a communication module 160 connected to the processing module, and the processing module is connected to the outside through the communication module. Specifically, the communication module adopts an RS232 communication interface, realizes the communication between the processing module and an external computer through a communication protocol, and realizes the parameter setting of the multi-camera synchronous control device.
As shown in fig. 3, in the present embodiment, the multi-camera synchronization control device further includes a storage module 170 connected to the processing module, and the storage module is used for storing the device parameter setting signal and implementing power down maintenance of the multi-camera synchronization control device. Specifically, the memory module is connected to the processing module by an Inter-Integrated Circuit (IIC) communication method.
In addition, in this embodiment, the multi-camera synchronization control apparatus further includes a clock module 180 connected to the processing module, where the clock module is configured to provide an operating clock for the multi-camera synchronization control apparatus and provide a control timing for the multi-camera synchronization acquisition. In one embodiment, the clock module uses a 50MHz passive crystal oscillator to provide an operating clock for the multi-camera synchronous control device.
Based on the multi-camera synchronous control device, as shown in fig. 4, after the working process is started, the processing module first determines whether the device parameters need to be reset, if so, changes the current parameters, determines whether an end mark exists after the change is determined, and if so, ends the processing. If the device parameters do not need to be reset, executing the current device parameters, judging whether a frame trigger signal exists, if so, sending a synchronous control signal to realize synchronous control (synchronous processing) of each camera, then judging whether an end mark exists, and if so, ending the processing.
The present invention is described in detail above by describing an implementation scenario case of each process separately, which can be understood by those skilled in the art. Modifications and variations may be made without departing from the spirit of the invention, such as the use of a partial module for stripping and embedding the system in other applications.
Claims (6)
1. A multi-camera synchronous control device, comprising:
a processing module, an encoder signal input module, a triggering module, a parameter signal input module and a synchronous control module, wherein,
the encoder signal input module is connected with the processing module and is used for sending an encoding signal generated by an encoder to the processing module;
the trigger module is connected with the processing module and is used for sending a trigger signal to the processing module;
the parameter signal input module is connected with the processing module and is used for sending a device parameter setting signal to the processing module;
the synchronous control module is connected with the processing module and is used for outputting a synchronous control signal and a variable frequency signal generated by the processing module to each camera so as to realize synchronous control of each camera and change of the line frequency of the camera;
the synchronous control module comprises a plurality of synchronous control units, each synchronous control unit is connected with the processing module, the number of the synchronous control units is matched with the number of the cameras, and the synchronous control units are differential output circuits.
2. Multi-camera synchronization control device according to claim 1,
the trigger module is connected with the processing module through a first optical coupling isolation module.
3. The multi-camera synchronous control device according to claim 1, wherein the parameter signal input module is connected to the processing module through a second optical coupling isolation module, and the second optical coupling isolation module comprises an input isolation unit and an output isolation unit.
4. The multi-camera synchronization control device according to any one of claims 1 to 3, further comprising a communication module connected to the processing module, wherein the processing module is communicatively connected to the outside through the communication module.
5. A multi-camera synchronization control device according to claim 1 or 2, further comprising a storage module connected to the processing module, wherein the storage module is configured to store device parameter setting signals and enable power-down maintenance of the multi-camera synchronization control device.
6. The multi-camera synchronization control device according to any one of claims 1 to 3, further comprising a clock module connected to the processing module, wherein the clock module is configured to provide an operating clock for the multi-camera synchronization control device and provide control timing for multi-camera synchronization acquisition.
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| CN108307117B (en) * | 2018-02-09 | 2020-03-10 | 湖南大学 | Full-field optical measurement multifunctional synchronous control device and method |
| CN112668681B (en) * | 2020-12-24 | 2022-07-01 | 杭州海康机器人技术有限公司 | Method, system and device for determining package information and camera |
| CN112887682B (en) * | 2021-02-23 | 2023-07-07 | 中国铁道科学研究院集团有限公司 | Multi-path track image synchronous acquisition and storage system and method |
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| CN102445450A (en) * | 2011-09-29 | 2012-05-09 | 广州南沙华卓化工有限公司 | Online detection device for optical film |
| CN102946510A (en) * | 2012-11-21 | 2013-02-27 | 合肥埃科光电科技有限公司 | High-speed complementary metal-oxide-semiconductor (CMOS) line scanning camera |
| CN104270568A (en) * | 2014-10-11 | 2015-01-07 | 沈阳理工大学 | Synchronous shooting control device of camera |
| CN104378560A (en) * | 2014-10-16 | 2015-02-25 | 苏州佑瑞检测技术有限公司 | Graph collecting system based on CMOS camera |
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| CN1132974A (en) * | 1994-11-02 | 1996-10-09 | Rca.汤姆森许可公司 | Vertical panning for interlaced video |
| CN104129404A (en) * | 2013-05-02 | 2014-11-05 | 上海工程技术大学 | Method and device for detecting looseness of rail fastener in high-speed dynamic real-time manner |
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Address after: 211100 No. 919, Tianyin Avenue, Jiangning District, Nanjing City, Jiangsu Province Patentee after: NANJING BANKNOTE MINTING Co.,Ltd. Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 211100 No. 919, Tianyin Avenue, Jiangning District, Nanjing City, Jiangsu Province Patentee before: NANJING BANKNOTE MINTING Co.,Ltd. Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |
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