Checker Radon Target
74,00 €*
Product information "Checker Radon Target"
Ready for direct shipment.
Checker Radon Targets for OpenCV's Sector-Based Corner Detection
Standard checkerboard detection locates corners first, then refines them to sub-pixel accuracy with a separate corner-refinement step, a process that can struggle with noise, defocus, or difficult lighting. OpenCV's newer sector-based detector, findChessboardCornersSB, takes a different approach: it uses a localized Radon transform (approximated by box filters) to detect and directly return sub-pixel corner positions in a single step. Based on the paper "Accurate Detection and Localization of Checkerboard Corners for Calibration" (Duda et al.), this method is documented by OpenCV to return corner positions that are more accurate than the classic approach, and it is also faster and more robust to noise on larger images.
Our Checker Radon Targets are designed specifically for this detector. Each pattern includes the wide white border and rounded corner-cell markers that OpenCV's documentation recommends for reliable Radon-based detection, so the board can be used directly with findChessboardCornersSB without any custom pattern design work on your side.
Like our standard Checker Target, this pattern remains fully compatible with OpenCV's classic findChessboardCorners pipeline and with MATLAB's Computer Vision Toolbox, so it can be used as a drop-in replacement in existing calibration workflows while giving you the option to switch to the higher-accuracy sector-based detector when needed.
Choosing the right resolution
We offer each board size in two pattern densities, so the checker size can be matched to your camera's resolution and working distance:
- Medium Resolution — larger checkers, designed for cameras below 2 megapixels
- High Resolution — finer checkers, designed for cameras above 2 megapixels, enabling more corners to be resolved within the same board area
Built for precision and durability, indoors or out
- Rigid, dimensionally stable panel keeps the pattern flat and accurately positioned
- Low thermal expansion minimizes pattern drift across temperature swings
- Water-resistant for outdoor use from −50°C to +80°C
- Rated for up to 3 years outdoors without significant degradation
Pattern Specifications
Medium Resolution
| Size (W x H x D) [mm] | Rows x Columns | Checker Size [mm] |
|---|---|---|
| 200 x 150 x 4 | 7 x 10 | 16 |
| 300 x 200 x 4 | 7 x 12 | 20 |
| 400 x 300 x 6 | 7 x 10 | 32 |
| 600 x 400 x 6 | 7 x 12 | 40 |
| 800 x 600 x 6 | 7 x 10 | 64 |
High Resolution
| Size (W x H x D) [mm] | Rows x Columns | Checker Size [mm] |
|---|---|---|
| 200 x 150 x 4 | 15 x 20 | 8 |
| 300 x 200 x 4 | 15 x 24 | 10 |
| 400 x 300 x 6 | 15 x 20 | 16 |
| 600 x 400 x 6 | 15 x 24 | 20 |
| 800 x 600 x 6 | 15 x 20 | 32 |
Technical Specifications
| Temperature Application Range | -50°C to +80°C |
|---|---|
| Linear Thermal Expansion | 24 μm / (°C · m) |
| Flatness Tolerance | ±200 μm |
| Relative Pattern Tolerance | ±100 μm |
| Absolute Pattern Tolerance | ±0.1% / m |
| Outdoor Lifetime | Up to 3 years |
| Water Resistance | Yes |