Requirements and recommendations🔗

Hardware requirements

It requires the Intel CORE I3-10100 or higher processor (CPU) to use the module on a surveillance server.

The module can run without a video card.

When the module runs in graphics card mode, it requires a NVIDIA graphics card (GPU) with features and performance not lower than the NVIDIA GTX 1650 model.

Camera installation requirements

Maximum allowable tilt and rotation angles for the camera:

  • Maximum allowable vertical tilt angle: 35°.

  • Maximum allowable horizontal tilt angle: 35°.

  • Maximum allowable rotation angle of the license plate's horizontal axis relative to the camera's axis: 35°.

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Video stream requirements

  • Resolution: not less than 1280⨯720 (HD) (provided that the character size requirements of the license plate are met).

  • Frame rate:

    • not less than 20 frames per second for the fast mode

    • not less than 10 frames per second for the medium and slow modes

Requirements to the license plate image

The license plate can be detected, and the registration number on it can be recognized under the following conditions:

  • The license plate is fully visible in the frame (not obscured by other objects and does not extend beyond the frame boundaries).

  • The minimum height of the recognizable characters should be no less than 15 pixels (country code characters are not considered recognizable characters).

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  • The image of the license plate and its characters should be high-contrast, free from noise, and not blurred.

The license plate text is correctly recognized both in color and black-and-white images.

The color of the license plate is recognized only in color images.

Settings recommendations

It is recommended to adjust and install the camera in such a way that the license plate of passing vehicles can be detected and recognized in the frame at least 3⨯N times, where N is the chosen value for the setting Number of license plate frames required for recognition. It should be noted that the setting Mode controls the frame processing frequency within the module. Thus, depending on the selected mode, the actual frame rate within the module will be:

  • Fast: 10 frames per second

  • Medium: 5 frames per second

  • Slow: 2.5 frames per second

Example: A car passes by in a manner that its license plate satisfies recognition conditions for 1.4 seconds. If the fast mode is selected, the module will see it approximately in 1.4⨯10 = 14 frames. Based on this, the maximum value for the setting Number of license plate frames required for recognition will be N=14/3 = 4 (dividing without remainder). In the medium mode, the maximum value for this setting will be 1.4⨯5/3 = 2, as the module in this mode processes frames only at a frequency of 5 FPS. When choosing higher values for the setting Number of license plate frames required for recognition or more economical values for the setting Mode the sensitivity of license plate detection will decrease.