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The proposed tutorial on Video-Based Dynamic Mesh Coding (V-DMC) begins with an introduction to the need for efficient compression of dynamic 3D meshes, emphasizing the challenges in volumetric media applications and the role of MPEG in addressing these through standardization. It highlights the key differences between V-DMC and other approaches used by the industry, alongside its practical applications in gaming, virtual reality, and digital twins.
The tutorial then explores into the V-DMC architecture, explaining the decomposition of the input 3D mesh frames into a sequence of base meshes, displacement vectors, attribute components, and associated timed metadata used for mesh reconstruction. The structure of the bitstream and the processes for encoding and decoding, supported by visual diagrams, are described in detail.
Participants will gain insight into the core technologies underlying V-DMC, such as methods for base mesh compression (e.g., Edgebreaker), displacement encoding using
wavelet transforms and quantization, the compression of texture attributes through remapping and video coding techniques.
A focused analysis of the bitstream syntax and semantics follows, detailing the organization of data and the integration with V3C technologies. The tutorial then explores the reconstruction process using timed atlas metadata, where the base mesh is refined through displacement vectors and texture attributes are mapped to achieve a seamless final output. The atlas metadata includes SEI messages for further enhancing reconstruction capabilities. Post-reconstruction methods, such as Zippering, are also explained.
The tutorial evaluates V-DMC’s performance, discussing the evolution of V-DMC’s compression efficiency during the standardization activity, visual quality metrics used, and real-world case studies from MPEG experiments. The session concludes with a discussion on future directions, highlighting ongoing research in motion vector simplification, lossy displacement coding, and V-DMC’s integration within the broader application ecosystem. The tutorial identifies opportunities for further innovation in dynamic mesh compression and invites participants to explore this evolving field.
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