4Real: Towards Photorealistic 4D Scene Generation via Video Diffusion
  Models
Authors: name: Heng Yu, name: Chaoyang Wang, name: Peiye Zhuang, name: Willi Menapace, name: Aliaksandr Siarohin, name: Junli Cao, name: Laszlo A Jeni, name: Sergey Tulyakov, name: Hsin-Ying Lee

Existing dynamic scene generation methods mostly rely on distilling knowledge
from pre-trained 3D generative models, which are typically fine-tuned on
synthetic object datasets. As a result, the generated scenes are often
object-centric and lack photorealism. To address these limitations, we
introduce a novel pipeline designed for photorealistic text-to-4D scene
generation, discarding the dependency on multi-view generative models and
instead fully utilizing video generative models trained on diverse real-world
datasets. Our method begins by generating a reference video using the video
generation model. We then learn the canonical 3D representation of the video
using a freeze-time video, delicately generated from the reference video. To
handle inconsistencies in the freeze-time video, we jointly learn a per-frame
deformation to model these imperfections. We then learn the temporal
deformation based on the canonical representation to capture dynamic
interactions in the reference video. The pipeline facilitates the generation of
dynamic scenes with enhanced photorealism and structural integrity, viewable
from multiple perspectives, thereby setting a new standard in 4D scene
generation.