Calibration Target

A calibration target is a critical component within a 3D camera array system, serving as a physical reference standard with precisely known dimensions and patterns. It is used during the calibration process to establish accurate spatial relationships between multiple cameras, correct for lens distortions, and ensure measurement accuracy across the entire field of view. The target provides the necessary data points for software algorithms to compute camera intrinsic parameters (focal length, principal point, distortion coefficients) and extrinsic parameters (position and orientation relative to other cameras).

The calibration target is placed within the overlapping field of view of the 3D camera array. Each camera captures images of the target's distinct patterns (such as checkerboards, circles, or coded markers). Software algorithms analyze these images to detect the target's features. By comparing the known physical dimensions and positions of these features on the target with their projected positions in the 2D camera images, the system calculates the precise mathematical model for each camera, including lens distortion corrections and the spatial transformation between all cameras in the array.