license plate recognition system < / a > precautions for camera installation

1. Camera angle

The angle of view of the camera should be kept less than 30 ° from the road surface of the recognizable area (Note: the road surface may be horizontal or slope). If it is greater than 30 °, it is likely to cause vehicle loss

2. Camera position

The camera can not be level with the road surface. Try to have some included angles. Adjust the height of the camera according to the distance of the recognizable area. If it is too horizontal, first, the license plate will enter the field of vision from a long distance. The results have been given when the license plate is relatively small, and the car license plate will affect the recognition rate, especially similar characters. Second, the camera is too horizontal, which is easy to cause direct headlights, and the license plate will be white, resulting in missing cars

3. Dual camera installation

When the two cameras work together, it should be noted that the recognition areas of the two cameras should overlap partially, which increases the scope of the recognizable area. Especially when the two camera left-right cooperation mode is installed on T-junctions, arcs and wide roads, it should be noted that in order to suppress the headlights, fill lights are required on both sides

4. Light

Try to avoid the camera in the dark (bright place) and the vehicle in the recognizable area in the light (dark place)