license plate recognition system < / a > common mode in parking lot system

There are three main application modes of license plate recognition system in parking lot management system: video recognition mode, ground induction coil recognition mode and video + ground induction recognition mode

I. video recognition mode

The advantage of video trigger is that there is no need to install ground induction coil and the engineering quantity is small. When the vehicle enters the video recognition area, the camera automatically recognizes the license plate information through the dynamic image of the vehicle, and provides simulation trigger recognition at the same time. The disadvantage is that the image cannot be output for unlicensed vehicles, and it is easy to miss vehicles. If the license plate is not recognized, you can manually click the simulation trigger for recognition

II. Ground induction coil recognition mode

The ground induction coil is triggered. Generally, a deceleration belt will be set at the position about 10 meters in front of the gate in the parking lot. The vehicle decelerates through the deceleration belt to allow time for license plate recognition. The vehicle enters the recognition area, triggers the ground induction coil, automatically commands the camera to capture, identifies the license plate through self character detection, and the gate is released. The ground induction coil triggered license plate recognition has the advantages of high trigger rate, not easy to miss vehicles, practical and stable performance, and can output image records for unlicensed vehicles. The disadvantage is that the construction and installation ground sense is required, and the engineering quantity is large

III. Video + ground sense recognition mode

This method is an upgraded version of the first two modes. The video plus ground sensing recognition mode is recognized by video recognition and uploaded by ground sensing trigger. Compared with ground coil recognition and video recognition mode, video + ground recognition mode can provide faster recognition speed and higher recognition rate. The recognition mode of flexible switching of video + ground sense is the recognition mode with the best application flexibility at present. By delimiting the recognition area and output area through software and freely setting the location of license plate output according to the customer's on-site environment, the problem of car following recognition and fire output too early can be solved. When the unlicensed vehicle travels to the output area, the information of unlicensed vehicle can be easily recorded