Improving Geometry in Sparse-View 3DGS via Reprojection-based DoF Separation

• URL: http://arxiv.org/abs/2412.14568v1
• Date: Thu, 19 Dec 2024 06:39:28 GMT
• Title: Improving Geometry in Sparse-View 3DGS via Reprojection-based DoF Separation
• Authors: Yongsung Kim, Minjun Park, Jooyoung Choi, Sungroh Yoon,
• Abstract summary: Recent learning-based Multi-View Stereo models have demonstrated state-of-the-art performance in sparse-view 3D reconstruction.<n>We propose reprojection-based DoF separation, a method distinguishing positional DoFs in terms of uncertainty.<n>We show that separating the positional DoFs of Gaussians and applying targeted constraints effectively suppresses geometric artifacts.
• Score: 35.17953057142724
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Recent learning-based Multi-View Stereo models have demonstrated state-of-the-art performance in sparse-view 3D reconstruction. However, directly applying 3D Gaussian Splatting (3DGS) as a refinement step following these models presents challenges. We hypothesize that the excessive positional degrees of freedom (DoFs) in Gaussians induce geometry distortion, fitting color patterns at the cost of structural fidelity. To address this, we propose reprojection-based DoF separation, a method distinguishing positional DoFs in terms of uncertainty: image-plane-parallel DoFs and ray-aligned DoF. To independently manage each DoF, we introduce a reprojection process along with tailored constraints for each DoF. Through experiments across various datasets, we confirm that separating the positional DoFs of Gaussians and applying targeted constraints effectively suppresses geometric artifacts, producing reconstruction results that are both visually and geometrically plausible.

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