What is a vehicle detector? The vehicle detector is also known as the traffic information detector. The vehicle detector is mainly a detection instrument invented to detect road traffic information. At present, a large number of high-tech technologies such as electromagnetic sensing technology, ultrasonic sensing technology, radar detection technology, video detection technology, computer technology, communication technology, etc. have been applied in traffic detection systems or traffic information collection systems both domestically and internationally. Traffic information detectors can be divided into buried and suspended types according to their installation methods. From the perspective of cost-effectiveness and high reliability, the most commonly used type is still the circular coil vehicle detector, but in recent years, video detectors have been increasingly used. So what are the main types of vehicle detectors for license plate recognition? Below, the editor of Chian Technology's license plate recognition system manufacturer will provide a detailed introduction to the types of vehicle detectors used for license plate recognition. There are mainly the following types:
1. License plate recognition - Circular coil vehicle detector
Circular coil detector (also known as ground sensor, mostly embedded detection system) is a traditional traffic detector and currently the largest used detection equipment in the world. The vehicle passes through a circular coil buried under the road surface, causing changes in the magnetic field of the coil. Based on this, the detector calculates traffic parameters such as vehicle flow, speed, time occupancy, and length, and uploads them to the central control system to meet the needs of the traffic control system. This method is technically mature, easy to master, and has the advantage of low cost
Secondly, License Plate Recognition - Wave Frequency Vehicle Detectors
Wave frequency vehicle detectors (mostly suspended detection systems) are detectors that use microwave, ultrasonic, and infrared radiation to induce electromagnetic waves emitted by vehicles. Here, we mainly introduce Microwave Vehicle Detectors (RTMS), which are low-cost and high-performance traffic detectors that can be widely used for license plate recognition and traffic information detection on urban roads and highways
Thirdly, License Plate Recognition - Video Vehicle Detector
The video vehicle detector for license plate recognition uses a video camera as a sensor, and sets a virtual coil within the video range, which is the detection area. When a vehicle enters the detection area, the background grayscale value changes to determine the presence of the vehicle, and thus detects the flow and speed of the vehicle
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