To ensure the recognition of state license plates using the License plate recognition (BRS), it is necessary to install and configure video cameras in such a way that the requirements described below are met.
Camera requirements
- The minimum video resolution is 640*480, the recommended resolution is 720p or 1080p.
- The minimum frame rate is 15 FPS, the recommended frame rate is 25–30 FPS.
- Autofocus and zoom would be useful for making small adjustments after configuring the detection tool.
- Automatic white balance.
- IR for night mode with good contrast of license plate images.
- HDR or WDR.
- In order to recognize state license plates on high-speed roads, the camera should have the Global Shutter mode.
Video image requirements
- The video image should be clear, contrasting, without distortion, not blurred.
- The video image should have minimum noise in low light conditions.
- The size of the license plate should be 15–70% of the total size of the image.
- The license plate must contain no more than two rows of characters.
Camera installation requirements
- The camera should be mounted at 0.6–2.4 meters above the ground.
- The angle formed by the lower line of the license plate and the horizon line should be from 0 to 20 degrees.