Circle Grid Calibration Target, Aluminium Composite
Circle grids for OpenCV and HALCON — robust when your images are soft or dim
Specifications
Physical
| Material | Aluminium / LDPE / aluminium composite |
| Thickness | 6 mm |
Accuracy
| Feature tolerance | ±0.3 mm + 0.2 mm/m (any circle centre to nominal grid, at 20 °C) |
| ±0.5 mm worst case at 800 mm | |
| Flatness | ≤ 0.5 mm per metre, board supported on three points |
| Calibration assumes all features lie in a single plane. Out-of-plane errors add directly to reprojection error. | |
| Operating temperature | −50 to +80 °C |
Deliverables
| Files included | .opencv.json, .halcon.descr, .dxf |
| Lead time | Made to order · ships in 2–3 weeks |
What’s in the box & files
- Calibration board in protective case
- Dimensional inspection report (PDF)
- Edge label with serial number
- Datasheet PDF · DXF drawing
- OpenCV JSON · Kalibr YAML
- HALCON .descr · ROS 2 YAML
- Per-feature coordinates CSV
Compatibility
| OpenCV | ≥ 4.6 · cv::aruco::CharucoBoard |
| Kalibr | YAML config file supplied |
| HALCON | Plate description file supplied |
| MATLAB | Camera Calibrator app |
| ROS 2 | camera_calibration package |
Inspection report & certificate
Factory inspection report (included) — every board measured by comparison against a golden sample. Report PDF and coordinates CSV at calib.tools/verify.
Measurement uncertainty — a quantified range within which the true value lies at a stated confidence level. An uncertainty can be stated for any properly performed measurement, including in-house inspections.
Shipping, returns & warranty
| Lead time | Made to order · ships in 2–3 weeks |
| Shipping | Tracked express from the factory. Import VAT and duties are settled at import (DAP) unless agreed otherwise. |
| Returns | 30 days, unused, in original case. |
| Warranty | 2 years against manufacturing defects. |
Frequently asked questions
Our aluminium composite targets are printed to ±0.3 mm + 0.2 mm/m (at 20 °C). Our ceramic targets have a ±2 µm target; we will publish the measurement method with the first production boards. Every target is measured before it ships, and you get its inspection report.
Every target comes with the board, a dimensional inspection report, a datasheet PDF, and downloadable config files for OpenCV, Kalibr, ROS 2 and HALCON.
Targets are made to order and ship from the factory in 2–3 weeks. Tracked express delivery takes 3–6 days to the EU, 3–5 days to the US. Custom sizes may add 1–2 weeks.
Yes. Use the free Pattern Generator to create any grid, then contact us to order it on a rigid substrate. Custom targets use the same material and print process as standard sizes.
A certificate is not required for most applications. The included inspection report confirms dimensional accuracy. For regulated environments (medical, automotive, aerospace), contact us about accredited calibration options.
Yes. All targets are designed to match OpenCV conventions: origin top-left, x right, y down. Corner IDs follow cv.findChessboardCorners and cv.aruco.CharucoBoard. Config files are generated for OpenCV, Kalibr, ROS 2 and HALCON.
Reviews from the bench
Bought this product? Use the link in your delivery e-mail to review it.How reviews work: We publish every review unedited and disclose material connections.
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Reviews arrive by invitation about two weeks after delivery. Until then, the inspection report of every unit is public at calib.tools/verify/<SN>.
