ReconX: Reconstruct Any Scene from Sparse Views with Video Diffusion
  Model
Authors: name: Fangfu Liu; name: Wenqiang Sun; name: Hanyang Wang; name: Yikai Wang; name: Haowen Sun; name: Junliang Ye; name: Jun Zhang; name: Yueqi Duan
Published: 2024-08-29 17:59:40

Abstract: Advancements in 3D scene reconstruction have transformed 2D images from the
real world into 3D models, producing realistic 3D results from hundreds of
input photos. Despite great success in dense-view reconstruction scenarios,
rendering a detailed scene from insufficient captured views is still an
ill-posed optimization problem, often resulting in artifacts and distortions in
unseen areas. In this paper, we propose ReconX, a novel 3D scene reconstruction
paradigm that reframes the ambiguous reconstruction challenge as a temporal
generation task. The key insight is to unleash the strong generative prior of
large pre-trained video diffusion models for sparse-view reconstruction.
However, 3D view consistency struggles to be accurately preserved in directly
generated video frames from pre-trained models. To address this, given limited
input views, the proposed ReconX first constructs a global point cloud and
encodes it into a contextual space as the 3D structure condition. Guided by the
condition, the video diffusion model then synthesizes video frames that are
both detail-preserved and exhibit a high degree of 3D consistency, ensuring the
coherence of the scene from various perspectives. Finally, we recover the 3D
scene from the generated video through a confidence-aware 3D Gaussian Splatting
optimization scheme. Extensive experiments on various real-world datasets show
the superiority of our ReconX over state-of-the-art methods in terms of quality
and generalizability.