GaussianFlow: Splatting Gaussian Dynamics for 4D Content Creation
Authors: name: Quankai Gao, name: Qiangeng Xu, name: Zhe Cao, name: Ben Mildenhall, name: Wenchao Ma, name: Le Chen, name: Danhang Tang, name: Ulrich Neumann

Creating 4D fields of Gaussian Splatting from images or videos is a
challenging task due to its under-constrained nature. While the optimization
can draw photometric reference from the input videos or be regulated by
generative models, directly supervising Gaussian motions remains underexplored.
In this paper, we introduce a novel concept, Gaussian flow, which connects the
dynamics of 3D Gaussians and pixel velocities between consecutive frames. The
Gaussian flow can be efficiently obtained by splatting Gaussian dynamics into
the image space. This differentiable process enables direct dynamic supervision
from optical flow. Our method significantly benefits 4D dynamic content
generation and 4D novel view synthesis with Gaussian Splatting, especially for
contents with rich motions that are hard to be handled by existing methods. The
common color drifting issue that happens in 4D generation is also resolved with
improved Guassian dynamics. Superior visual quality on extensive experiments
demonstrates our method's effectiveness. Quantitative and qualitative
evaluations show that our method achieves state-of-the-art results on both
tasks of 4D generation and 4D novel view synthesis. Project page:
https://zerg-overmind.github.io/GaussianFlow.github.io/