Traffic Flow Survey Camera Site Survey Key Points: Installation Angle, Height, and License Plate Pixel Resolution
Scientific site survey determines data accuracy. This document provides vertical/horizontal angle ranges for road and entrance/exit scenarios, license plate pixel requirements, and device selection parameters.
1Why do identical devices show significantly different data accuracy?
Accurate data collection relies on scientifically installed equipment. Camera angle, height, and distance determine vehicle size in the frame and motion trajectory clarity. Improper installation leads to missed detections, duplicate counts, or license plate recognition failures. Thus, site survey is the first step in traffic flow analysis.
2Solution: Scenario-based requirements
For road scenarios, the recommended vertical angle is 10°–15°, and the horizontal angle when side-mounted is 0°–20°. For entry/exit scenarios, the recommended vertical angle is 0°–5°, and the horizontal angle is 5°–10°. Since directly measuring angles on-site is often impractical, adjust installation height and distance to achieve the desired angles indirectly. Ensure the capture point is positioned in the lower-middle area of the camera view, specifically at coordinates 1/4 to 1/3.
3Data Validation: Acceptance Based on License Plate Pixel Count and Device Parameters
The horizontal pixel count of the license plate must be at least 80px to ensure accurate recognition and comply with mainland China license plate standards. On the device side, select a high-performance infrared AI bullet camera like the Huawei HoloSens SDC WAN-D2152: 500 megapixels, 1 TOPS computing power, 120dB wide dynamic range, and 50m IR distance. It features intelligent analysis and software customization capabilities for optimal performance in low-light and backlit environments.
Frequently Asked Questions
Adjust the mounting height and horizontal distance to control the angle. Using the display as a reference, position the capture point in the lower portion of the screen within the 1/4 to 1/3 area.
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