Novel approach to circular points based camera calibration

摘要

In this paper, we introduce the linear constrains of circular points on camera's intrinsic parameters firstly and propose the uniqueness condition of the solutions, then we elaborate a novel linear approach for computing the images of circular points as well as camera calibration from images of two unparallel coplanar rectangles in space. The main advantage of our technique lies in that neither the metric measurement of the rectangles nor the correspondences between images are required. Extensive simulations and experiments with real images, as well as the comparative study with Zhang's method, validate our algorithms and demonstrate that the proposed technique is of high precision and strong robustness.