Occlusion in augmented reality

Augmented reality in video-based display simply overlay virtual objects on real environment. In many cases this does not represent the actual situation in AR scene. When a real object supposes to occlude a virtual object, the augmented image may cause confusion in users´ perception. This incorrect display contributes to misconceptions and wrong operations of task amongst users. The scenario of occlusion in AR application is discussed in this paper. Next, the main method used by other researchers to resolve occlusion problem was discussed. This is followed by a discussion about dependency factors and characteristics that influence the selection of occlusion handling approach and a comparison between a model-based and depth-based approach. Finally, a conclusion and proposed work are presented.