  Talking face synthesis driven by audio is one of the current research
hotspots in the fields of multidimensional signal processing and multimedia.
Neural Radiance Field (NeRF) has recently been brought to this research field
in order to enhance the realism and 3D effect of the generated faces. However,
most existing NeRF-based methods either burden NeRF with complex learning tasks
while lacking methods for supervised multimodal feature fusion, or cannot
precisely map audio to the facial region related to speech movements. These
reasons ultimately result in existing methods generating inaccurate lip shapes.
This paper moves a portion of NeRF learning tasks ahead and proposes a talking
face synthesis method via NeRF with attention-based disentanglement (NeRF-AD).
In particular, an Attention-based Disentanglement module is introduced to
disentangle the face into Audio-face and Identity-face using speech-related
facial action unit (AU) information. To precisely regulate how audio affects
the talking face, we only fuse the Audio-face with audio feature. In addition,
AU information is also utilized to supervise the fusion of these two
modalities. Extensive qualitative and quantitative experiments demonstrate that
our NeRF-AD outperforms state-of-the-art methods in generating realistic
talking face videos, including image quality and lip synchronization. To view
video results, please refer to https://xiaoxingliu02.github.io/NeRF-AD.
