You must install and configure the cameras in such a way that the following requirements are met:
| Type of requirements | Purpose | Requirements for the video image from the camera that is used for detection |
|---|
| Basic requirements | To determine the speed of the vehicle | - Camera installation height is at least four meters
- The time period when a vehicle is in front of the camera with a fully readable state license plate, or when a vehicle that is fully in the frame and accurately recognized must be at least 500 ms
- Time stamps for frames must not differ from the real time by more than two ms
- When calibrating values, the measured road section must be at least three meters wide and five meters long. In this case, the key points in the image must be at least 300 pixels apart. The measurement error during calibration (difference between actual and entered measured values) must not exceed 1%
- Camera must be rigidly fixed and must not move during gusts of wind and other physical forces
- All of the following rules must be followed by default:
- The bounding rectangle of the state license plates doesn't touch the bottom part of the frame in both selected frames for speed calculation
- The offset of the center of the rectangle between the two selected frames is at least four meters and 100 pixels
- The time difference between two selected frames is at least 100 ms
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| To determine the driving direction of the vehicle | - Camera installation height is at least three meters
- Angle between camera and road direction is not more than 30°
- Minimum camera tilt
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| To recognize the make and model of the vehicle | - Visible width of the vehicle is from 100px
- Color or black and white image
- Front view of the vehicle
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| To recognize the color of the vehicle | - Visible width of the vehicle is from 100px
- The scene illumination must be at least 50 lux. Under low or excessive illumination (night or backlight), the stability of the analytics operation is not guaranteed. There are no abrupt changes in illumination
- Color image with a normal color grade
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| To determine the condition of the headlights | - Visible width of the vehicle is from 100px
- Front view of the vehicle
- Evening, night or foggy shooting conditions are required
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