Explore CALITAR checkerboard, ChArUco, circle-grid, and AprilGrid targets for camera calibration and pose estimation.
ChArUco
Combines chessboard-level corner accuracy with marker identification, supporting calibration even when part of the board is occluded.
Checkerboard
Designed for OpenCV's findChessboardCornersSB detector, with a wide white border and rounded corner-cell markers for reliable detection.
The classic checkerboard offers high-accuracy corners for intrinsic calibration, lens-distortion correction and stereo-rig alignment.
Circle Grid
Alternating offset rows remove 180° rotational ambiguity, allowing a unique board orientation to be determined from detected circle centers.
An inverted white-on-black version of the asymmetric circle grid, retaining offset rows for unambiguous target orientation.
A regular rectangular lattice suited to fixed-viewpoint rigs and constrained setups using OpenCV or MATLAB circle-grid calibration.
AprilGrid / Kalibr
An AprilGrid built for Kalibr multi-camera and camera-IMU calibration, including setups where only part of the target is visible.
