Abstract
Camera calibration procedures that utilize patterns with rectangular grids can exhibit geometric anisotropies, which can introduce directional biases during parameter estimation and affect accuracy, for example, in systems with wide-angle lenses. A calibration system can use a target with fiducial markers, such as circles of different sizes, arranged on a triangular or hexagonal grid. A local encoding mechanism can identify an interior feature by generating a code based on the properties of its six nearest neighbors, which can facilitate matching two-dimensional image (2D) features to known three-dimensional (3D) world coordinates. The use of an isotropic grid, combined with a local encoding scheme, can supply more uniform geometric constraints during an optimization process, which may improve the robustness and accuracy of determined camera parameters.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Kim, Taemin, "Camera Calibration System Using a Triangular Grid and Local Feature Encoding", Technical Disclosure Commons, (February 27, 2026)
https://www.tdcommons.org/dpubs_series/9409