Abstract: The key technology of Augmented Reality (AR) is 3D registration, that is to compute the virtual-real synthesis parameters based on real scenes. In order to expand the outdoor application of AR, a triangulation-based registration method is proposed to reduce the computational complexity of virtual-real synthesis by constructing the triangulation on the main object of the real scene. It depends on neither the marker used in indoor application nor the sensing technology used in outdoor application. Taking terrain as an example, it can get the 3D information through single frame instead of two different frames in the past and can quickly finish the virtual-real synthesis. This method provides a new approach to solve the key technology of outdoor AR systems.

Key words: computer application, augmented reality, 3D registration, triangulation, virtual-real synthesis