Realization of Multilayer Occlusion between Real and Virtual Scenes in Augmented Reality

Augmented reality system is well suited for computer supported cooperative work. For achieving visual realism, correctly handling and representing occlusion between virtual and real objects in augmented reality scene is essential. In this paper we present an approach for realizing multilayer occlusion. Differing qualitatively from previous work in AR occlusion, our algorithm realizes multilayer occlusion, and its application domain involves indoor-field occluded objects, which are several meters distant from the viewer. Previous related work has focused on monolayer occlusion, and near-field occluded objects, which are within or just beyond arm´s reach. We designed a special scene graph tree comprised of some special nodes, namely EMO nodes. According to the location of real moving object, different EMO node is activated in real-time, consequently realizing the multilayer occlusion. Experimental results are provided to demonstrate the multilayer indoor-field occlusion