Standard Item of Camera Calibration Target
| Standard Model NO. | Substrate Material | Coating Type | Overall Target Size | Active Pattern Area | Checkerboard Pattern | Array | Feature Accuracy |
| LTO-6045-05-C | Matte Ceramic | Blue Chrome | 15 x 15mm | 6.0 x 4.5mm | 0.5 x 0.5mm | 12 x 9 | ±2μm |
| LTO-9008-05-C | Matte Ceramic | Blue Chrome | 15 x 15mm | 9.0 x 0.75mm | 0.75 x 0.75mm | 12 x 9 | ±2μm |
| LTO-1290-10-C | Matte Ceramic | Blue Chrome | 15 x 15mm | 12 x 9.0mm | 1.0 x 1.0mm | 12 x 9 | ±2μm |
| LTO-18135-15-C | Matte Ceramic | Blue Chrome | 18 x 13.5mm | 18 x 13.5mm | 1.5 x 1.5mm | 12 x 9 | ±2μm |
| LTO-2418-20-C | Matte Ceramic | Blue Chrome | 30 x 25mm | 24 x 18mm | 2.0 x 2.0mm | 12 x 9 | ±2μm |
| LTO-2624-20-C | Matte Ceramic | Blue Chrome | 30 x 30mm | 26 x 24mm | 2.0 x 2.0mm | 12 x 13 | ±2μm |
| LTO-3627-30-C | Matte Ceramic | Blue Chrome | 45 x 45mm | 36 x 27mm | 3.0 x 3.0mm | 12 x 9 | ±2μm |
| LTO-3936-30-C | Matte Ceramic | Blue Chrome | 45 x 45mm | 39 x 36mm | 3.0 x 3.0mm | 12 x 13 | ±2μm |
| LTO-4836-40-C | Matte Ceramic | Blue Chrome | 50 x 50mm | 48 x 36mm | 4.0 x 4.0mm | 12 x 9 | ±2μm |
| LTO-5248-40-C | Matte Ceramic | Blue Chrome | 60 x 60mm | 52 x 48mm | 4.0 x 4.0mm | 12 x 13 | ±2μm |
| LTO-6560-50-C | Matte Ceramic | Blue Chrome | 76 x 70mm | 65 x 60mm | 5.0 x 5.0mm | 12 x 13 | ±2μm |
| LTO-7872-60-C | Matte Ceramic | Blue Chrome | 88 x 88mm | 78 x 72mm | 6.0 x 6.0mm | 12 x 13 | ±2μm |
| LTO-10496-80-C | Matte Ceramic | Blue Chrome | 111 x 106mm | 104 x 96mm | 8.0 x 8.0mm | 12 x 13 | ±2μm |
| LTO-10881-90-C | Matte Ceramic | Blue Chrome | 108 x 81mm | 108 x 81mm | 9.0 x 9.0mm | 12 x 9 | ±2μm |
Specification of Camera Calibration Target
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Product Specification of Camera Calibration Pattern（All configurations outside the table are custom items and need to be quoted separately.） |
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| Pattern | Substrate Material | ||||||
| Production Process | Laser Writing | Type | Chrome pattern on the matte ceramic substrate |
Chrome pattern on the glossy ceramic substrate |
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| Type | Matte Ceramic | Glossy Ceramic | Substrate Material of Ceramic |
White or near white reflective material, comprising of 96% compacted Alumina. |
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| Minimum Line/space |
4μm | 2μm | Thickness | 1mm (±0.1mm) (common) |
0.38mm (±0.1mm) |
0.635mm (±0.1mm) |
2mm (±0.1mm) |
| Feature Accuracy |
±2μm | ±2μm | Surface Flatness) | <30μm (Dimension<100mm) |
<60μm (Dimension<200mm) |
<100μm (Dimension>200mm) |
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| Overall Accuracy |
±0.05mm | ±0.05mm | MAX / MIN Overall Size |
MIN: 4x4mm (±0.1mm) MAX: 228x228mm (±0.1mm) |
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| Coating Type |
Chrome | Chrome | Surface Roughness | <0.2-0.7μm | |||
| Coating Glossy or Matte |
Matte | Glossy | Thermal Expansion Coeff (40-400 ℃) |
<6.7X10⁻6/K | |||
| Reflectivity | < 12.88% @550nm | < 9.56% @550nm | Specific Gravity | ≥ 3.66 g/cm3 | |||
| < 10.62% @650nm | < 1.89% @650nm | ||||||
| < 12.23% @750nm | < 11.168% @750nm | ||||||
| Coating Thickness |
100-120nm | Rockwell hardness | ≥80 HRA | ||||
| Positive / Negative | Positive: Opaque Pattern, Clear Background. Negative: Clear Pattern, Opaque Background. |
Overall Shape | Any Shape by Laser Cutting |
Square | Oval | Round | |
| Protection layer | Pellicle above the chrome layer making the chrome pattern more durable. |
Special-shaped | Hole | Chamfer | Angle | Corner | |
Camera Calibration Target Details
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Product Process of Camera Calibration Target
| Coating Type of OpenCV Camera Calibration Board | ||
| Type |  |
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| Matte Ceramic | Glossy Ceramic | |
| Minimum Line/space of Checkerboard Calibration Target | 4μm | 2μm |
| Feature Accuracy | ±2μm | ±1μm |
| Overall Accuracy | ±2μm | ±1μm |
| Coating Type | Chrome | Chrome |
| Coating Glossy or Matte of Machine Vision Calibration Target | Matte | Glossy |
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• Cutting is accurate, tolerance ±0.01mm. |
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Photograph of Camera Calibration Target
FAQ of Camera Calibration Target
1. What OpenCV patternSize should be used with this Camera Calibration Target?
OpenCV requires the number of internal corners, not the number of printed squares. The page’s dimensions indicate that a 12 × 9 array contains 12 × 9 squares, so the OpenCV patternSize should be set to 11 × 8. A 12 × 13 version should use 11 × 12 internal corners.
2. How should the square size of the Camera Calibration Target be entered in OpenCV?
Enter the actual side length of one checker square when defining the object points. For example, the LTO-6045-05-C model uses 0.5 mm squares, so adjacent object points should be spaced 0.5 mm apart. An incorrect value will produce an incorrect physical scale and translation distance.
3. How should I select the checker size for a Camera Calibration Target?
The page provides standard checker sizes from 0.5 mm to 9 mm. Select a size that keeps the complete board inside the image while making every internal corner clearly detectable. Squares that occupy too few pixels reduce corner accuracy, while oversized squares may leave too few corners visible.
4. Should this matte ceramic Camera Calibration Target use front lighting or backlighting?
Use front lighting. The target is made from reflective alumina ceramic rather than transparent glass, so light cannot pass through it for backlit imaging. Diffuse and uniform front illumination helps reduce glare, shadows and local overexposure.
5. How many images should be captured with the Camera Calibration Target?
OpenCV recommends at least 10 usable calibration views. Capture the target at different positions, distances and tilt angles, including near the image edges. Ten nearly identical images provide less useful calibration data than a varied set covering the full field of view.
6. When should calibration with the Camera Calibration Target be repeated?
Repeat calibration after changing the camera, lens, focus setting, image resolution, ROI or mechanical mounting position. Calibration parameters belong to a specific camera and lens configuration and should not be assumed to remain valid after the optical setup changes.