1D Displacement Coding for the Displaced Subdivision Surface

Compression of a dynamic mesh, which represents the dynamic volumetric data for immersive applications, is an emerging technique. One advanced compression technique is video-based dynamic mesh coding (V-DMC). Therein, an original mesh is decomposed into a decimated base mesh including displacement vectors in the V-DMC framework. Because the mesh represents an object in 3D space, these displacements, which express the detailed information of the mesh, are also represented as 3D vectors over the subdivision surface. However, such representation of a 3D vector is redundant because the displacement direction is almost equal to a normal direction of the subdivision surface. Hence, we present a 1D displacement coding that operates with an existing video codec. This method improves both the encoding/decoding procedure complexity and the coding performance on dynamic mesh coding when compared to competing approaches.