The license plate recognition is a pattern recognition technology that uses the dynamic video or static image of the vehicle to automatically identify the license plate number and the license plate color. The core technologies include license plate location algorithm, license plate character segmentation algorithm and optical character recognition algorithm. A complete license plate recognition system should include vehicle detection, image acquisition, license plate recognition and other parts. Here to talk about how to match the image capture front-end equipment license plate camera.
Camera: You can use the auto iris when you set the shutter speed. For license plate applications, you must set a fixed shutter speed. You must never allow the camera to play.
Lens: It is best to select a fixed-focus lens. Before you purchase, you must repeatedly determine the position of the on-site camera to ensure that you choose the right focal length. Fixed-focus lenses are easy to adjust, with larger apertures and higher resolution at the same price.
LED fill light: For low-cost applications, the use of license plate directional reflection characteristics is almost the only way (real strictly license plate capture must also have a body image, to do this must be more complex and expensive Filling light scheme: Directional reflection is actually a luminaire equipped with a white LED next to the camera.To confirm whether there is a video sync pulse function and to determine the angle of light emission, this angle also depends on the position of your camera .
Whether the license plate recognition system can maximize its effectiveness is related to its on-site installation and construction capabilities, in addition to the selection of software technology cameras. The user may request the manufacturer to go to the site to inquire and propose a plan for building a plan, first assessing the location to be erected, the angle of the photographic frame, whether an auxiliary light source needs to be erected, and then making a quotation, which will cause the professional road monitoring camera to fail to show an effect. . Therefore, in addition to the differences in the camera itself, the installation of the camera requires knowledge of the scope of the test area, the location of the license plate in the entire frame, and the installation angle and height.
License plate camera erection points, erection relative angle
1. The distance between the image monitoring area and the camera installation position is about 30M - 50M.
2. The height of the camera is about 2.8M. If the erection height is higher, the distance from the image monitoring area must be extended because the image capture angle of the related camera cannot be too large (about 15 degrees).
3ã€When using the lens, be sure to pay attention to the lens used in general intersection monitoring. There are two specifications 6 - 60 & 10 - 100MM
4. The angle of image capture should try to magnify the position of the license plate and car as much as possible without bringing the scenery to the screen to avoid excessive exposure or cause the license plate to be unclear.
5, if the use of infrared (IR) power at night must be large, because the car's lights are also a kind of infrared spectrum , to avoid the exposure effect only to increase the IR's power to play the role of IR
Matching errors:
License plate snapping has nothing to do with low illumination. The essence of the license plate capture is the use of fill light or light suppression technology to overpower the car's headlamps within one thousandth of a second, which is the way to obtain the best image effects.
Intelligent traffic monitoring is to ensure the smoothness of the city's security, and the license plate recognition of road monitoring junctions is an important part of traffic monitoring. Road monitoring is not only about monitoring the general traffic conditions, but also that it is possible to capture illegal vehicles through professional road surveillance cameras, or to capture them quickly and completely in the event of a traffic accident, and at any time. In any environment, the license plate can be completely and clearly identified, and then the storage screen can be captured, so that law enforcement agencies can successfully track and cooperate with various software and other devices to become true intelligent traffic monitoring.
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