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In this letter, we envision a new metaverse communication paradigm forvirtual avatar faces, and develop the semantic face compression with compact 3Dfacial descriptors. The fundamental principle is that the communication ofvirtual avatar faces primarily emphasizes the conveyance of semanticinformation. In light of this, the proposed scheme offers the advantages ofbeing highly flexible, efficient and semantically meaningful. The semantic facecompression, which allows the communication of the descriptors for artificialintelligence based understanding, could facilitate numerous applicationswithout the involvement of humans in metaverse. The promise of the proposedparadigm is also demonstrated by performance comparisons with thestate-of-the-art video coding standard, Versatile Video Coding. A significantimprovement in terms of rate-accuracy performance has been achieved. Theproposed scheme is expected to enable numerous applications, such as digitalhuman communication based on machine analysis, and to form the cornerstone ofinteraction and communication in the metaverse.

Semantic Face Compression for Metaverse: A Compact 3D Descriptor Based Approach