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To sum up, illegal parking automatic capture, there are several typical technology models.
1, from the type of camera to capture points (1) analog fast dome camera capture analog standard definition camera because of the fast zoom, low price and low transmission requirements, used in automatic capture, has obvious advantages; analog camera can be easily Achieve 36x optical zoom (mainstream of network HD cameras etc. is still 20 times), so the effective capture radius can reach 150 meters, realizing the license plate close-up, 150 meters before and after, can reach a capture distance of 300 meters, and van der Tech because of the car , license plate for close-up, the key information is also very clear on the screen.
However, because the end customer often thinks that high-definition technology represents advanced technology, this kind of inertial understanding has caused the simulation capture mode to have a good actual effect and an excellent price/performance ratio, but it is not easy to sell.
(2) HD high-speed dome camera capture HD capture includes network HD, SDI digital high-definition and analog multi-line high-definition, because of transmission and other reasons, the actual mainstream is the network HD capture.
Network HD can achieve higher definition and reduce the difficulty of analyzing vehicles and license plates. However, compared with analog SD, because the number of pixels increases, the amount of processing operations for the capture host greatly increases, and it is necessary to improve the hardware processing capability of the capture host. The mainstream web cameras on the market, the 720P, 1080P main manufacturers of cameras, based on 20x optical zoom, according to the requirements of the license plate close-up, can capture a vehicle about 75 meters away, before and after 75 meters, you can reach 150 Meter's snap distance.
2, from the capture host deployment mode to (1) front-end deployment mode The so-called front-end deployment mode, is to put the host capture camera to the front of the camera, and the camera together hanging on the outdoor pole, and then send the results of the capture to the back-end mode .
To deploy to the front-end, industrial embedded hosts need to be used to improve the adaptability to temperature, humidity, etc., and the stability of the capture host is required to be high.
For simulation ball machine capture, because the simulation does not require high transmission and the transmission effect is stable, the capture host is placed on the front end and the back end, which basically does not affect the effect of the capture, but is centralized on the back end and is obviously maintenance. Work brings benefits.
For network HD domes, the actual engineering installation is now installed at the front end; to meet the real-time video requirements of the capture host (cars can be opened several meters in one second, and the network transmission delay will significantly affect the capture).
(2) Back-end deployment model For analog cameras, there will be no delay in the back-end and front-end of the capture host, and there is no difference in the capture effect, and it is convenient for centralized maintenance on the back-end.
The high-definition network cameras, on the back-end, the transmission bandwidth requirements are extremely high, for the 1080P stream, a stable 20Mbps fiber transmission, compressed before transmission; at the same time dozens of roads, hundreds of roads and more video transmission to the computer room The impact of the routing and switching equipment on the transmission is also very large. In practical cases, broadcast storms are not well controlled, resulting in the inability to capture the results.
3, from the capture of the number of points for the simulation of the ball machine capture, a capture host supports single or multi-channel capture, according to capture host capture card can support the number of ways to determine, there can be single, 2 , 4 or more ways.
The network high-definition dome camera captures, because there is no need for a video capture card, you can upgrade the capture host to a server and support more snapshots.
The same data transmission challenges are similar to those mentioned earlier in this article. If multiple paths are supported, such as 2-way, 4-way, or 8-way or even a server supporting more than 10 or dozens of ways, the server's processing capacity is considered. All are possible.
However, after the superposition of multiple video streams, the processing capability of the server network card is a great challenge; once the network card handles more than 100M streams per second, the network card may cause instability.
Multi-channel video, if it is only 2-way video processing, you can put the host to the front of the camera to handle the stream of the two cameras; if it is 4 or more streams, the capture host (or server) can only focus on The engine room adopts a back-end deployment mode, which puts a test on the network delay, routing and other processing capabilities.
Fande Technology Network HD capture, can support single, multi-channel, the actual case is also a single deployment to the front, multi-channel high-definition technology can support up to 10 or more, but it is recommended to use 2 multi-channel Mainly.
4, from the host type to divide the vanguard technology illegal parking automatic capture product has developed to the third generation; before the third generation of VandeTech's products use DSP embedded board, snap faster, follow-up to continuously improve the capture effect, In particular, the capability of “all-weather†high-speed capture at night under conditions of low light, rain, snow, strong winds, etc., and the intelligent rules of system processing are continuously increased. In order to achieve the perfect effect of capturing, the mainframe platform for capturing images has been transplanted from the DSP platform to the embedded industrial control. Machine platform.
From the point of view of vanguard's illegal parking products, it is divided into DSP version and embedded IPC version. Because of the good environmental adaptability of the embedded IPC, it can achieve very stable results both in indoor and outdoor deployments.
5, from the identification of technical patterns to illegal parking automatic capture, not only to find a static vehicle from the video, but also to exclude the impact of dynamic vehicles, personnel, trees shaking, light, weather, involving static and dynamic detection, is More comprehensive applications in the field of intelligent image technology.
No one or one or two open algorithms can realize the function of the product well. Since 2009, Vandetech has finally reached the product through repeated testing and optimization of multiple public and private algorithms such as dynamic detection and dynamic background. For a good environment adaptability, whether it is a large-angle recognition, 360-degree recognition, bad weather, night light, etc., can work stably and efficiently.
Technology is endless, innovation can give products a stronger vitality; Vandetech captures products in many provinces and cities in violation of arrests, and has accumulated a wealth of project experience, but further progress, technological progress is never satisfied.
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After the rapid development of illegal parking in recent years, it has become more and more adaptable to a variety of complex environments to achieve a better capture effect; in particular, Vande Technology's automatic capture system, weak light at night, headlight backlight, etc. The scene can also be captured efficiently; advances in technology have played an irreplaceable role in the management of traffic safety.
September 26, 2021