vehicle detection function of license plate recognition system < / a >

Vehicle detection can adopt buried coil detection, infrared detection, radar detection, video detection and other methods. Using video detection can avoid damaging the road surface, no need to add external detection equipment, no need to correct the trigger position, save expenses, and is more suitable for mobile and portable applications

The license plate recognition system with video vehicle detection function first collects and digitizes the signal of one frame (field) in the video signal to obtain the corresponding digital image; Then analyze it to determine whether there are vehicles; If it is considered that there are vehicles passing, proceed to the next step for license plate recognition; Otherwise, continue to collect video signals for processing

For video vehicle detection, the system needs to have high processing speed and adopt good algorithms to realize image acquisition and processing without losing frames. If the processing speed is slow, it will lead to frame loss, so that the system cannot correctly detect the vehicle with fast driving speed. At the same time, it is difficult to ensure that the recognition processing is started at the position conducive to recognition, which will affect the recognition rate of the system. Therefore, the combination of video vehicle detection and automatic license plate recognition has some technical difficulties