Calibration Plate Specifications
The calibration plate must meet the following specifications. See Checkerboard calibration specifications, the bottom figure under Calibration Plate Image Requirements.
- The calibration plate tiles should be perfectly square. However, the feature extractor that works on the calibration plate image will tolerate tile aspect ratios of from 0.8 to 1.2.
- The dimensions of the black tiles and the white tiles must be equal.
- Choose the calibration plate surface material to minimize reflections and non-uniformities. The surface material choice will depend on the camera optics and the surface illumination.
- Including a registration fiducial in your calibration plate is optional. If you include a fiducial, only use one that conforms to the pattern and dimensions shown in Checkerboard calibration specifications.
- Calibration plate dimension tolerances must be carefully controlled during the manufacturing process. This is usually more difficult when you make smaller calibration plates. Measure your completed calibration plate carefully to ensure the accuracy of the vertices.
Note:
If you are not able to maintain the needed vertex accuracy on completed calibration plates, the plates can still be used to create a feature correspondence list for calibration. See Using a Checkerboard Calibration Plate.
If you are not able to maintain the needed vertex accuracy on completed calibration plates, the plates can still be used to create a feature correspondence list for calibration. See Using a Checkerboard Calibration Plate.