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Stable Signer V3: 4D Deformable Primitive Splatting Is All You Need for Sign Language Production

2026-10-20 07:14:53
Sen Fang, Liwei Che, Dimitris N. Metaxas
arXiv_AI
         
Abstract

We present Stable Signer V3, an interactive high-resolution sign language avatar system built on 4D Deformable Primitive Splatting. It addresses three limitations of existing avatars: restricted facial expression, inaccurate identity-specific body deformation, and loss of fine appearance details. Shared Face Primitive Splatting adds transferable superquadric primitives for richer expression control; Test-Time Body Primitive Splatting learns an identity-specific virtual muscle layer for more faithful motion; and Test-Time Tunneling Super-Resolution uses TunnelingNet to recover identity-specific high-resolution details. Both test-time modules are optimized once per signer identity; inference then runs entirely from the stored identity parameters. Together, they reduce facial geometry error by 71.4%, body-boundary error by 35.1% across ten identities, and high-resolution RGB reconstruction error by 24.2% on held-out evaluations, while retaining interactive streaming.

Abstract (translated)

URL

https://arxiv.org/abs/2610.24926

PDF

https://arxiv.org/pdf/2610.24926.pdf

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