How to Install License Plate Recognition?
3 Answers
Installation method for license plate recognition barrier system: 1. First, determine the installation position of the license plate recognition all-in-one machine: This will directly affect the recognition effect. The position should be decided based on the on-site environment and conditions of each entrance and exit. Generally, one camera is installed per lane. If the vehicle's direction when entering the lane is not fixed, a large angle may affect recognition, so consider installing a secondary camera to ensure recognition regardless of the vehicle's orientation. 2. Next, if using snapshot recognition, determine the installation positions of the camera and loop: The optimal distance between the camera and the loop on the incoming vehicle side is 4-4.5m. The loop position should ensure that when the vehicle triggers the vehicle detector, the front of the vehicle is tilted toward the camera side as much as possible, allowing the camera to capture clear and complete images. For a single lane (where the entrance and exit are the same lane), a dual-channel vehicle detector is required. 3. Then, determine the positions of the barrier and anti-collision loop: The barrier is usually installed on the same side as the camera, behind the camera (30cm from the camera pole to ensure the barrier gate can open conveniently). The anti-collision loop is centered directly under the barrier arm, ensuring that no part of the vehicle is under the barrier arm when the front triggers the loop or the rear leaves the loop.
I've done this several times for our neighborhood property management. The first step in installing license plate recognition is choosing the right camera position - it must capture license plates of incoming/outgoing vehicles, with an ideal mounting height around 2 meters. Pay special attention to waterproofing the wiring, using outdoor junction boxes with heat shrink tubing. The most time-consuming part is angle adjustment - test while adjusting with a laptop to ensure reflective plates remain visible during rainy nights. Finally connect the LPR host to the barrier gate controller; when adjusting lifting speed, remember to leave buffer distance to avoid hitting vehicles. Last time we completed installation in three hours - the key was using Cat6 POE cabling to eliminate separate power lines.
After installing two sets of automatic recognition systems, I've learned that the key is to position the license plate recognition camera before the lane turn, allowing the vehicle to face the lens head-on for 3 to 5 seconds. I've used a 2-megapixel bullet camera with fill light, which achieves a 30% higher nighttime recognition rate compared to standard models. Wiring should be run through galvanized pipes to prevent rodents from chewing through the cables. It's best to connect the power supply to a separate circuit breaker, as I've experienced motherboard burnouts due to voltage instability. During setup, first install the management software on a computer and set the sensitivity to level 7 for optimal performance—higher settings may mistake stains for numbers. The entire system can be purchased online for just over 3,000 yuan, saving half the cost compared to hiring an installation team.
