Angles each profile expects
Angles are measured from straight down (0°) to looking straight ahead (90°).
- Basic motion, overhead: 0–20°.
- Basic motion, tilted: 20–70°.
- AI people and vehicles: 20–90°.
- AI people: 0–90°.
- AI faces: 80–90°.
Choose the profile from the angle the camera actually has, not from what the space is called.
People at doors and gates
- The most accurate count is from directly overhead, because people cannot hide behind each other. Use an overhead profile with it.
- A wall-mounted camera works too: mount it high, looking along the direction people walk, so each person is seen for a few metres before and after the line.
- Keep the doorway away from the edge of the frame. Objects need to be tracked for a moment either side of a line.
Vehicles
- Look along the road or driveway rather than straight across it, so vehicles stay in view for longer.
- Front or rear views need the vehicle to be smaller in the frame than a side-on view does (see below).
- For speed, leave room for two lines several metres apart, well inside the frame.
Faces (age and gender estimates)
Faces need a near face-on view: the camera close to head height, looking along the direction people walk, and the stream at 720p or 1080p. See Age and gender estimates before you plan one.
The smallest object it will count
- AI, vehicle front or back: at least 4% of frame width
- AI, vehicle side-on: at least 10% of frame width
- AI, person: at least 3% of frame width
- AI, face: at least 4% of frame width
- Basic motion, any moving object: at least 3% of frame width, absolute minimum
Below these sizes, counts fall away. Move the camera closer, zoom in, or put the line where objects look bigger.
Avoid
- Glare: windows, low sun and wet surfaces that wash the picture out.
- The far side of a steep angled view, where people and vehicles are tiny.
- Counters, shelves, pillars or signs that hide most of an object as it crosses.
- Automatic doors, lifts, trees and screens in view: exclude them with the area of interest.
Still stuck?
Email support@crowdsense.events with your account reference (it starts CS-D-), the computer’s name and a screenshot of what you see. For sales questions, contact us.
