Installation Height and Angle Guidelines for Footfall Cameras: Indoor, Entrances, and High-Ceiling Scenarios
Installation height and tilt angle directly determine counting accuracy. This article provides recommended ranges and tuning methods for three indoor scenarios: corridors, entry/exit points, and high-ceiling spaces.
1The device is installed, but why is the count still incorrect?
Most counting deviations are not algorithmic issues but result from installation positions outside the recommended range. Excessive tilt compresses people moving in opposite directions into a single cluster, while insufficient tilt makes it difficult to distinguish heads from shoulders. If mounted too low, taller pedestrians may block targets behind them. When the lens is misaligned with the passage, the counting line fails to remain perpendicular to the flow direction, causing diagonal passersby to be missed or double-counted.
2Solution: Determine height and tilt angle by scenario
For indoor corridors and store entrances, install at a height of 2.5–3.5 meters with a vertical tilt angle of 0°–15°, pointing directly down the corridor. For entry/exit gates and turnstiles, install at 2.5–4 meters with a tilt angle of 0°–10°, ensuring the counting line is perpendicular to the flow direction. For atriums exceeding 5 meters in height, use a telephoto lens or column mounting to ensure head pixel resolution remains above 60 px. After installation, re-measure the tilt angle on-site and observe continuously for over 30 minutes to verify that entry/exit counts match actual traffic.
3Data validation: Confirm using pixel count and accuracy metrics.
During debugging, first verify that the pixel count of heads in the frame meets requirements. If not, prioritize adjusting focal length or camera position rather than increasing algorithm sensitivity. Next, perform hourly manual sampling and cross-check against device output. For entry/exit scenarios, accuracy should typically remain stable above 95%. If significant deviations occur during specific time periods, they are likely due to lighting changes or crowd density at those times; address these by adding targeted lighting or adjusting the counting line position.
Frequently Asked Questions
Not necessarily. You can often improve results by adjusting the PTZ tilt, changing the lens focal length, or repositioning the mount. Re-selecting a location is only required if the height is critically insufficient or the detection line cannot be made perpendicular to the channel.
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