One-Shot Face Avatar Generation in a Single Forward Pass with Identity Preservation

Face avatar generation has gained significant attention recently. With the help of the Neural Radiance Field (NeRF), existing 3D methods alleviate facial distortion in 2D methods under large pose changes. However, the state-of-the-art 3D methods still require additional optimization for generation on each given portrait, even in a one-shot manner. To address this research gap, we propose a novel one-shot approach, which achieves effective face avatar generation in only a single forward pass. This is made possible by introducing an inversion encoder trained on a large-scale dataset for accurate latent code estimation and an expression animator for accurate expression control. Our approach is also designed for better preservation of the face identity by training an additional 3D feature refiner based on cross-attention. Experimental results demonstrate the superiority of our approach in terms of 3D consistency, identity similarity, and image quality.