Camera requirements for License plate recognition (RR)

To ensure recognition of state license plates using appropriate detection tools, it is necessary to install and configure video cameras in such a way that the following requirements are met:

• Character height is at least 10px, preferably 20px or more.
• Minimum resolution is 1280*720. The recommended resolution is 1920*1080.
• Minimum frame rate for the Slow mode is 5 FPS. Minimum frame rate for the Fast mode is 20 FPS.
• Maximum horizontal angle is 30°.
• Maximum vertical angle is 45°.
• Expected image contrast: the contrast difference between characters of the LP and the background should be at least 20 units with the image brightness scale from 0 to 255.
• In order to recognize state license plates on high-speed roads, the camera should have the Global Shutter mode.