Occlusion handling using semantic segmentation and visibility-based rendering for mixed reality

Abstract

Real-time occlusion handling is a major problem in outdoor mixed reality system because it requires great computational cost mainly due to the complexity of the scene. Using only segmentation, it is difficult to accurately render a virtual object occluded by complex objects such as vegetation. In this paper, we propose a novel occlusion handling method for real-time mixed reality given a monocular image and an inaccurate depth map. We modify the intensity of the overlayed CG object based on the texture of the underlying real scene using visibility-based rendering. To determine the appropriate level of visibility, we use CNN-based semantic segmentation and assign labels to the real scene based on the complexity of object boundary and texture. Then we combine the segmentation results and the foreground probability map from the depth image to solve the appropriate blending parameter for visibility-based rendering. Our results show improvement in handling occlusions for inaccurate foreground segmentation compared to existing blending-based methods.