How does the license plate recognition system identify?

How does the license plate recognition system identify, also known as license plate number recognition, vehicle license plate recognition, vehicle license plate recognition, etc. It applies computer video image recognition technology to vehicle license plate recognition, that is, the license plate number in the image information is extracted and processed. identify.

The principle of license plate number recognition is roughly divided into four main modules: image acquisition, license plate positioning, character segmentation and character recognition, and then use software programming to realize each part of the content, finally determine the license plate and output the license plate number and other related information. All environmental cameras are installed at a distance of 4 to 6 m from the camera and a license plate width of 120 to 160 meters. Due to the different relative rotation angles of the license plate and the body, it will affect the captured image and cause image distortion.

To solve this problem, we designed an automatic correction system to eliminate this phenomenon. The license plate on the camera is in a parallel state. 1.

When the standard lane has no corners, the determination range of the license plate recognition area is the interval of 4-5 m. 2. If the bending angle is too large, it is necessary to judge the angle and the parallelism of the license plate.

3. The parallel angle does not exceed 15°, and the slope angle does not exceed 45°. 4.

The individual width of the road surface is not more than 4.5 m. 5.

Pay attention to the setting of rainwater manhole covers and guardrails in the on-site environment. 6. The direction and location of license plate recognition should try to avoid similar items.

Judgment of the installation location of license plate recognition in non-standard environment: 1. Install the camera on the left-turn lane on the right side of the driving direction. 2.

The right-turn lane camera is installed on the left side of the driving direction. 3. For the lanes that turn left or right in the direction of travel, you need to set up cameras on the left or right respectively.

4. The camera needs to be set at the outer bend to ensure the parallelism of the license plate.