[Paper] Enhancement of Motion Field Coding by Integrating Duplicated Vertices in Dynamic Mesh Compression

Abstract

Motion field coding is an essential technique for exploiting temporal correlations in the ongoing standard of Video-based Dynamic Mesh Coding (V-DMC), which is crucial for efficient dynamic mesh compression. In V-DMC, the motion field comprises a set of motion vectors (MVs) that represent the positional changes of vertices between corresponding decimated meshes (called base meshes in V-DMC) of current and reference frames. This paper presents an enhanced motion field coding approach that effectively reduces the number of MVs required. The proposed method leverages the observation that base meshes often contain duplicate vertices with identical MVs. By integrating these vertices, the method achieves a more compact representation, while distinct MVs for the few duplicate vertices are explicitly coded to preserve mesh quality. Experimental results using MPEG test sequences demonstrate that the proposed approach can decrease the MV data size by up to 20% without compromising the quality of the reconstructed meshes.