Atlas level rate distortion optimization for 6DoF immersive video compression

The Moving Picture Experts Group (MPEG) has started an immersive media standard project to enable multi-view video and depth representation in three-dimensional (3D) scenes. The MPEG immersive video (MIV) standard explores the six degree of freedom (6DoF) technologies of immersive content to support motion parallax. Despite the standard being designed to compress multi-view immersive media, MIV coding has not been investigated from the perspective of bit allocation. This paper presents an efficient bit allocation scheme for atlas level compression. The proposed model establishes a model of view synthesis distortion and analyzes the impact of distortion on complete views and patches. This paper also introduces packing alignment to separate two types of patches and characterize the distortion for each MIV atlas. By considering these characteristics, the proposed model derives a bitrate ratio between texture and geometry for model-based view-rendering optimization. Experimental results showed that the proposed method achieved a more accurate reconstruction of sequences under common test conditions (CTCs).