Automatic correspondence approach for feature points in camera calibration

A simple correspondence approach in camera calibration is proposed based on Delaunay triangulation to automatically match the image coordinates with the world coordinates for feature points with regular grid network structure. The topological structure of the feature points was generated by Delaunay triangulation and pretreatment which removes the redundant triangles. The correspondence between the image coordinates and world coordinates of feature points was implemented by using the topological structure. The experimental results show that the proposed approach is simple, robust, and not sensitive to lens distortion. The approach can still effectively implement the feature point correspondence when the pattern is viewed from an oblique angle and under occlusion condition. It is most suitable for on-line camera calibration.