1. Print & verify the ChArUco board
Print the A4 page at 100% / "Actual size". Tape it flat on the table near the centre of the surface you want to measure.
- Measure the 100 mm bar with a ruler.
- Or place a credit card (ID-1, 85.60 × 53.98 mm) inside the dashed outline.
2. Capture 4–8 photos
The ChArUco board must be visible in every photo. Walk around the table covering >180° of view. Each shot is auto-validated; bad shots are rejected before they enter the session.
Open the camera
0 / 6 good photos
Tips for accuracy
- Use the main rear camera, not the ultrawide / 0.5×.
- Take photos from at least 4 distinct angles around the table.
- Avoid harsh shadows and direct reflections on glass tabletops.
- Keep the board flat — paper warp introduces error.