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To ensure the vehicle license plates recognition with the LPR IntelliVision software module, install and configure cameras so that the following requirements are met:

Camera specifications
  • the minimum video resolution of 640x480, the recommended resolution of 720p or 1080p;
  • the minimum frame rate of 15 fps, the recommended frame rate of 25-30 fps;
  • autofocus and zoom features are advisable to enable small changes after recognizer’s configuration;
  • automatic white-balance / automatic gain control;
  • high-contrast IR for night mode;
  • HDR / WDR.
Video image
  • the video image must be clear and contrast, without aberration;
  • the size of the license plate must be 10-70% of the total frame size;
  • there should be single or two-row of symbols on a license plate.
Camera positioning
  • the camera is to be 0,6-2,4 meters above the ground;
  • the angle between the license plate bottom border and the horizon line should be of 0 to 20 degrees. 
Vehicle speed
  • slow to moderate (8-40 kmph).


Info
titleNote

Current license plate recognition algorithm works only with alphanumeric symbols (A-Z, 0-9). In some countries specific letters on a license plate can be displayed as * after recognition.


Info
titleNote

For the examples of correct and incorrect video images, see Appendix 8. Examples of correct and incorrect video images for the IntelliVision software module.


Note
titleImportant!
 It is also recommended to study the manufacturer's specification.