A novel marker system in augmented reality

In augmented reality systems, the three dimensional registration technology based on artificial markers has been widely used. The registration algorithm based on artificial markers is divided into two steps: (1) marker detection and recognition, (2) estimation of camera pose. In this paper, a novel marker is designed based on projective invariants principle, such as collinearity between points and cross-ratio. Compared with the markers used in the ARToolkit, our new marker can greatly reduce the storage space of marker templates. And based on this marker, a new detection and recognition algorithm is proposed. By using the algorithm, the registration in AR system still can be successfully completed even when the marker is occluded by 62.5%, which greatly improves the robustness of the registration algorithm. The experimental results show that the marker and the algorithm posed in this paper are effective.