Dynamic Mesh Coding using Orthogonal Atlas Projection

Dynamic meshes, which are meshes that frequently change their connectivity, are commonly used in AR/VR applications. Compared to tracked mesh sequences with fixed connectivity, dynamic meshes have improved quality and simpler generation process, but also represent a large amount of data. The ongoing international standard for dynamic mesh compression uses a low-resolution mesh sequence, called a basemesh, and additional data, such as displacement information and texture maps, to efficiently compress the dynamic mesh sequence. The basemesh requires reparameterization of the input mesh, which includes texture mapping generation. This paper describes a novel method of texture mapping generation recently adopted by the ongoing standard based on orthographic projection of mesh surface patches called orthoAtlas. We transmit the projection parameters instead of texture coordinates in the basemesh and additionally create texture maps with higher temporal correlation. Compared to the state-of-the-art methods used for mesh reparameterization, orthoAtlas can achieve higher compression performance while also reducing the texture mapping generation time.