Despite the increasing popularity of avatar systems such as Snapchat Bitmojis, existing production avatar platforms face several limitations, such as a limited number of predefined assets, tedious customization processes, and inefficient rendering requirements. Addressing these shortcomings, we introduce Snapmoji, an avatar generation system that instantly creates 3D avatars, and enables customization in a process we call dual-stylization. Snapmoji first maps a selfie of a user to a primary avatar (e.g., Bitmoji style) using a new technique we name Gaussian Domain Adaptation (GDA), then applies a secondary style (e.g., skeleton, yarn, toy) to the primary avatar, all while preserving the user's identity. The generated 3D avatars can then be rendered an animated on mobile devices at 30-40 FPS.

翻译：尽管诸如Snapchat Bitmoji等虚拟形象系统日益流行，现有的生产级虚拟形象平台仍面临若干局限，例如预定义资产数量有限、定制过程繁琐以及渲染效率要求不足。为应对这些不足，我们提出了Snapmoji——一种能够即时生成3D虚拟形象的系统，并通过我们称为“双风格化”的过程实现定制。Snapmoji首先采用我们命名为高斯域适应（GDA）的新技术，将用户自拍照映射至主风格虚拟形象（例如Bitmoji风格），随后对主风格虚拟形象应用次级风格（例如骨骼、纱线、玩具风格），同时完整保留用户身份特征。生成的3D虚拟形象可在移动设备上以30-40 FPS的帧率进行渲染与动画驱动。