CN103108190A - System and method of achieving image synchronization between analog camera and high definition cameras - Google Patents
System and method of achieving image synchronization between analog camera and high definition cameras Download PDFInfo
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- CN103108190A CN103108190A CN 201110362051 CN201110362051A CN103108190A CN 103108190 A CN103108190 A CN 103108190A CN 201110362051 CN201110362051 CN 201110362051 CN 201110362051 A CN201110362051 A CN 201110362051A CN 103108190 A CN103108190 A CN 103108190A
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Abstract
The invention relates to a system of achieving image synchronization between an analog camera and high definition cameras. An inferior industrial personal computer (IPC) module is connected with the plurality of high definition cameras through a network switching module and is connected with the analog camera through the network switching module and an analog video collection and control module in sequence, a reference clock unit is arranged in the inferior IPC module, a central control unit in the analog video collection and control module is respectively connected with a first real-time clock unit and an image caching unit, a second real-time clock unit is arranged in each high definition camera, and the first real-time clock unit and the second real-time clock units are respectively kept synchronized with the reference clock unit. The invention further relates to a method of achieving the image synchronization between the analog camera and the high definition cameras. The system and the method of achieving the image synchronization between the analog camera and the high definition cameras are stable and reliable in performance and relatively wide in the application range, and the problem of the synchronization between the analog camera and the high definition cameras is solved.
Description
Technical field
The present invention relates to the electronic police field, particularly monitoring camera-shooting technical field in electronic police system specifically refers to realize between analog video camera and high-definition camera in a kind of electronic police system the system and method for image synchronization.
Background technology
In modern society, continuous increase along with automobile quantity in the city, road management also needs to continually strengthen, and electronic police system is as a kind of high-tech monitoring means, become the indispensable important tool of modern road safety management, wherein most important is exactly camera system, comprising analog video camera and high-definition camera.
Therefore analog video camera is with respect to high-definition camera, and its luminous sensitivity has sizable advantage, adopts analog video camera to do the mode that panorama, high-definition camera are done number plate, and all well and good performance is arranged on the picture effect at night.But be different from analog video camera, adopt the mode of centralized control, existing high-definition intelligent video camera has adopted the mode of distributed control.Therefore to realize simultaneously two kinds of control modes to system require excessively, and the centralized control mode of single employing can increase the workload of controlling software greatly; And distributed control mode but is difficult to allow complete between analog video camera and high-definition camera and synchronizes, and namely is difficult to guarantee number plate picture and panoramic pictures relation one to one.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of stationary problem between analog video camera and high-definition camera, simple and practical, stable and reliable working performance, scope of application of can effectively solving to realize comparatively widely the system and method for image synchronization in electronic police system between analog video camera and high-definition camera.
In order to realize above-mentioned purpose, realize between analog video camera and high-definition camera in electronic police system of the present invention that the system and method for image synchronization is as follows:
realize the system of image synchronization in this electronic police system between analog video camera and high-definition camera, its main feature is, described system comprises the analog video acquisition control module, network exchange module and the next industrial computer module, described the next industrial computer module is connected with several high-definition cameras by network exchange module, and described the next industrial computer module is connected with analog video camera with the analog video acquisition control module by described network exchange module successively, be provided with the reference clock unit in described the next industrial computer module, described analog video acquisition control module comprises central control unit, the first real-time clock unit and image buffer storage unit, described central control unit is connected with the image buffer storage unit with described the first real-time clock unit respectively, be provided with the second real-time clock unit in described each high-definition camera, described the first real-time clock unit and the second real-time clock unit keep synchronizeing with described reference clock unit respectively.
Realize between analog video camera and high-definition camera in this electronic police system that the central control unit in the system of image synchronization is TI DM642 chip.
Realize circulation storage at least 256 pictures in the image buffer storage unit in the system of image synchronization in this electronic police system between analog video camera and high-definition camera.
Realize between analog video camera and high-definition camera in this electronic police system that the analog video acquisition control module in the system of image synchronization is connected with described analog video camera by the BNC video line.
Should realize in electronic police system the method for image synchronization between analog video camera and high-definition camera based on above-mentioned system, its main feature is that described method comprises the following steps:
(1) system carries out the initialization setting, and described the first real-time clock unit and the second real-time clock unit are carried out the clock synchronous setting with described reference clock unit respectively;
(2) CPU in described analog video acquisition control module with the simulation picture of analog video camera institute real-time grasp shoot and from described the first real-time clock unit the shooting time information that obtains deposit in the lump in described image buffer storage unit;
(3) described high-definition camera with the high definition picture of institute's real-time grasp shoot and from described the second real-time clock unit the high-definition shooting temporal information that obtains preserve, and be sent to described the next industrial computer module by described network exchange module;
(4) described the next industrial computer module is extracted described high-definition shooting temporal information, and is sent in described analog video acquisition control module by described network exchange module;
(5) CPU in described analog video acquisition control module is according to this high-definition shooting temporal information, search out and the corresponding simulation picture of the immediate shooting time information of this high-definition shooting temporal information from described image buffer storage unit, and be sent to described the next industrial computer module by described network exchange module;
(6) described the next industrial computer module is exported described simulation picture and high definition picture in the lump.
This realizes in electronic police system high definition picture and high-definition shooting temporal information are preserved in the method for image synchronization between analog video camera and high-definition camera, is specially:
Described high-definition shooting temporal information is kept in the file header information of high definition picture.
This realizes in electronic police system that between analog video camera and high-definition camera, the file format of the high definition picture in the method for image synchronization is jpeg format.
Adopted the system and method for realizing image synchronization in the electronic police system of this invention between analog video camera and high-definition camera, due to wherein adopted unified to the time platform, carry out both pictures rear synchronous, thereby efficiently solve the stationary problem between analog video camera and high-definition camera, make time take industrial computer as benchmark, guaranteed that time error between video camera and video box is in 20ms, the video acquisition box is in acquisition state always simultaneously, constantly the data that collect are kept in image buffer, and circulation covers; High-definition camera just carries out the candid photograph of image when needs are arranged, thereby utilize on-the-spot industrial computer to form in time unanimously, utilize the size of the acquisition function of analog video collecting cassette and analog video camera picture less, safeguarded a buffering area that picture is recalled, thereby reaching analog video camera synchronizes with the picture between high-definition camera, simple and practical, stable and reliable working performance, the scope of application are comparatively extensive.
Description of drawings
Fig. 1 is the system architecture schematic diagram of realizing image synchronization between analog video camera of the present invention and high-definition camera.
Embodiment
In order more clearly to understand technology contents of the present invention, describe in detail especially exemplified by following examples.
see also shown in Figure 1, realize the system of image synchronization in this electronic police system between analog video camera and high-definition camera, wherein, described system comprises the analog video acquisition control module, network exchange module and the next industrial computer module, described the next industrial computer module is connected with several high-definition cameras by network exchange module, and described the next industrial computer module is connected with analog video camera with the analog video acquisition control module by described network exchange module successively, be provided with the reference clock unit in described the next industrial computer module, described analog video acquisition control module comprises central control unit, the first real-time clock unit and image buffer storage unit, described central control unit is connected with the image buffer storage unit with described the first real-time clock unit respectively, be provided with the second real-time clock unit in described each high-definition camera, described the first real-time clock unit and the second real-time clock unit keep synchronizeing with described reference clock unit respectively.
Wherein, realize between analog video camera and high-definition camera in this electronic police system that the central control unit in the system of image synchronization is TI DM642 chip, circulation storage at least 256 pictures in this image buffer storage unit, described analog video acquisition control module is connected with described analog video camera by the BNC video line.
Should realize in electronic police system the method for image synchronization between analog video camera and high-definition camera based on above-mentioned system, comprising following steps:
(1) system carries out the initialization setting, and described the first real-time clock unit and the second real-time clock unit are carried out the clock synchronous setting with described reference clock unit respectively;
(2) CPU in described analog video acquisition control module with the simulation picture of analog video camera institute real-time grasp shoot and from described the first real-time clock unit the shooting time information that obtains deposit in the lump in described image buffer storage unit;
(3) described high-definition camera with the high definition picture of institute's real-time grasp shoot and from described the second real-time clock unit the high-definition shooting temporal information that obtains preserve, and be sent to described the next industrial computer module by described network exchange module; This preserves high definition picture and high-definition shooting temporal information, is specially:
Described high-definition shooting temporal information is kept in the file header information of high definition picture; The file format of this high definition picture is jpeg format;
(4) described the next industrial computer module is extracted described high-definition shooting temporal information, and is sent in described analog video acquisition control module by described network exchange module;
(5) CPU in described analog video acquisition control module is according to this high-definition shooting temporal information, search out and the corresponding simulation picture of the immediate shooting time information of this high-definition shooting temporal information from described image buffer storage unit, and be sent to described the next industrial computer module by described network exchange module;
(6) described the next industrial computer module is exported described simulation picture and high definition picture in the lump.
In the middle of reality was used, realization of the present invention was based on these points content:
● analog video camera is taked distributed control mode, utilize the dsp chip of TI, the IMAQ passage of DM642 chip, maximum can realize the access of 6 road analog videos.Can realize the analog video collection of per second 20 frames at least.By the programming to the DM642 chip, complete distributed control mode, and at the image buffer of video acquisition box internal distribution that is consisted of by the DM642 chip, circulation storage 256 pictures.Real Time Clock System of video box inner sustain is preserved the time of capturing picture, and forms unification with clock system in the next industrial computer;
● high-definition camera inside is kept a Real Time Clock System equally, forms unification with clock system in the next industrial computer; Video camera is captured relevant picture according to capturing logic, and the time will capture the time is kept in the jpeg header of picture and passes to down in the lump the next industrial computer;
● industrial computer is resolved the candid photograph time in picture, and this time is sent to the video box after obtaining camera picture.The video box is selected immediate picture of time again from 256 image buffers according to this candid photograph time, and send to slave computer.
● guaranteed image synchronization between analog video camera and high-definition camera by such flow process.
Therefore, according to such candid photograph flow process, also require to keep between industrial computer and video camera and video box lasting time adjustment function.Take time of industrial computer as benchmark, guarantee that time error between video camera and video box is in 20ms.The video acquisition box should constantly be kept at the data that collect in image buffer always at acquisition state, and circulation covers; High-definition camera just carries out the candid photograph of image when needs are arranged.A kind of mechanism like this utilizes on-the-spot industrial computer to form in time unanimously exactly, utilizes the size of the acquisition function of analog video collecting cassette and analog video camera picture less, safeguards the buffering area that picture is recalled.Reaching analog video camera synchronizes with the picture between high-definition camera.
In system of the present invention, key is that analog video camera is done a distributed control by the analog video collecting cassette, between video camera, video box and industrial computer three, by common clock of network operation, then seek according to the candid photograph time of image after capturing the simulation picture that matches.
Adopted the system and method for realizing image synchronization in above-mentioned electronic police system between analog video camera and high-definition camera, due to wherein adopted unified to the time platform, carry out both pictures rear synchronous, thereby efficiently solve the stationary problem between analog video camera and high-definition camera, make time take industrial computer as benchmark, guaranteed that time error between video camera and video box is in 20ms, the video acquisition box is in acquisition state always simultaneously, constantly the data that collect are kept in image buffer, and circulation covers; High-definition camera just carries out the candid photograph of image when needs are arranged, thereby utilize on-the-spot industrial computer to form in time unanimously, utilize the size of the acquisition function of analog video collecting cassette and analog video camera picture less, safeguarded a buffering area that picture is recalled, thereby reaching analog video camera synchronizes with the picture between high-definition camera, simple and practical, stable and reliable working performance, the scope of application are comparatively extensive.
In this specification, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (7)
1. realize the system of image synchronization in an electronic police system between analog video camera and high-definition camera, it is characterized in that, described system comprises the analog video acquisition control module, network exchange module and the next industrial computer module, described the next industrial computer module is connected with several high-definition cameras by network exchange module, and described the next industrial computer module is connected with analog video camera with the analog video acquisition control module by described network exchange module successively, be provided with the reference clock unit in described the next industrial computer module, described analog video acquisition control module comprises central control unit, the first real-time clock unit and image buffer storage unit, described central control unit is connected with the image buffer storage unit with described the first real-time clock unit respectively, be provided with the second real-time clock unit in described each high-definition camera, described the first real-time clock unit and the second real-time clock unit keep synchronizeing with described reference clock unit respectively.
2. realize the system of image synchronization in electronic police system according to claim 1 between analog video camera and high-definition camera, it is characterized in that, described central control unit is TI DM642 chip.
3. realize the system of image synchronization in electronic police system according to claim 1 between analog video camera and high-definition camera, it is characterized in that, circulation storage at least 256 pictures in described image buffer storage unit.
4. realize the system of image synchronization in electronic police system according to claim 1 between analog video camera and high-definition camera, it is characterized in that, described analog video acquisition control module is connected with described analog video camera by the BNC video line.
5. realize in electronic police system the method for image synchronization between analog video camera and high-definition camera based on system claimed in claim 1 for one kind, it is characterized in that, described method comprises the following steps:
(1) system carries out the initialization setting, and described the first real-time clock unit and the second real-time clock unit are carried out the clock synchronous setting with described reference clock unit respectively;
(2) CPU in described analog video acquisition control module with the simulation picture of analog video camera institute real-time grasp shoot and from described the first real-time clock unit the shooting time information that obtains deposit in the lump in described image buffer storage unit;
(3) described high-definition camera with the high definition picture of institute's real-time grasp shoot and from described the second real-time clock unit the high-definition shooting temporal information that obtains preserve, and be sent to described the next industrial computer module by described network exchange module;
(4) described the next industrial computer module is extracted described high-definition shooting temporal information, and is sent in described analog video acquisition control module by described network exchange module;
(5) CPU in described analog video acquisition control module is according to this high-definition shooting temporal information, search out and the corresponding simulation picture of the immediate shooting time information of this high-definition shooting temporal information from described image buffer storage unit, and be sent to described the next industrial computer module by described network exchange module;
(6) described the next industrial computer module is exported described simulation picture and high definition picture in the lump.
6. according to claim 5ly realize in electronic police system the method for image synchronization between analog video camera and high-definition camera, it is characterized in that, described high definition picture and high-definition shooting temporal information are preserved, be specially:
Described high-definition shooting temporal information is kept in the file header information of high definition picture.
7. according to claim 6ly realize in electronic police system the method for image synchronization between analog video camera and high-definition camera, it is characterized in that, the file format of described high definition picture is jpeg format.
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| CN111432152A (en) * | 2014-12-14 | 2020-07-17 | 深圳市大疆创新科技有限公司 | Data processing method, device and system, non-transitory computer readable medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111432152A (en) * | 2014-12-14 | 2020-07-17 | 深圳市大疆创新科技有限公司 | Data processing method, device and system, non-transitory computer readable medium |
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