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Charuco Live

Metric gait • cameras only • 2026

1. PRINT THE BOARD

Print from this page. Then measure one black square with a ruler and type that millimetre value. Do not trust printer scale.

Squares X Squares Y Measured square length (mm) Marker / square ratio

2. CAMERAS

Camera A (required) Camera B (optional stereo)

Use one computer and two USB webcams. Do not load video files. Sync is the live clock in this page.

3. CALIBRATE

Place the board on the walkway floor. Move each camera so the board fills different parts of the frame. Hold still when the overlay turns green.

No calibration yet.

4. CAPTURE WALK

Board can leave the frame after calibration if the cameras do not move.

Decision-support only. Metric scale comes from the measured square length. Two-camera 3D is triangulated on a software clock (typically 0.5–2 frames). Not a genlocked laboratory system.

Camera A

Camera B

World view (board frame, Y up, millimetres)