How much is the speed measurement of Youshi Shiling?

The principle of speed measurement is a physical term. According to the speed of the vehicle passing through the parallel coil, it is judged whether the vehicle is speeding or not, and photos are taken for evidence collection. The disadvantage of this detection method is that the construction of the induction coil buried on the ground is large, and once the road surface is changed, the coil needs to be buried again. In addition, in the high latitude freezing period and the low latitude summer road surface and the poor road surface quality, the maintenance workload of the coil is huge.

Video detection tracks the process of illegal vehicle behavior through the analysis of continuous video images, and captures illegal photos through analysis and control. The advantage of the system is that it is not limited by road conditions, and the installation does not need to destroy the road surface, nor does it need to bury the induction coil under the road surface. It is a new generation of road vehicle detection method to detect traffic data by setting a camera above the road. The disadvantage of video is that it is difficult to identify moving vehicles. On the one hand, shooting high-speed vehicles requires a fast shutter (at least 1/3000PX), enough pixels and image algorithm; On the other hand, at intersections, crossings, and expressway entrances and exits, the speed is generally slow, and common violations include running a red light, crossing the line illegally, and choosing the wrong lane. These behaviors can be monitored without radar and high-speed cameras, and the purpose can be achieved by using a slow shutter. In addition, video technology is influenced by light and weather.