G-MASt3R-SfM: Graph-based View Pruning and Multi-stage Optimization for Robust SfM

Toshiki Watanabe, Shintaro Ito, Natsuki Takama, Koichi Ito, Takafumi Aoki,
Graduate School of Information Sciences, Tohoku University
2026 IEEE International Conference on Image Processing (ICIP)

Abstract

Structure from Motion (SfM) is essential for multi-view 3D reconstruction, however, its accuracy heavily relies on the accuracy of image matching. While the recent correspondence matching method, MASt3R, enables robust matching even under challenging conditions, it tends to generate incorrect correspondences for non-overlapping image pairs. Consequently, existing SfM methods using MASt3R, such as MASt3R-SfM, suffer from significant degradation in pose estimation accuracy as they incorporate these unreliable matches directly into optimization. To address this issue, we propose G-MASt3R-SfM, a novel SfM pipeline that enhances robustness through two key modules. First, the Graph-based View Pruning (GVP) module constructs a scene graph from matching confidence and geometrically prunes outlier views. Second, the Multi-Stage Optimization (MSO) module progressively refines camera parameters by expanding the optimization scope from local consistency to the global consistency. Experiments on the ETH3D dataset demonstrate that our method achieves state-of-the-art accuracy in both camera pose estimation and 3D reconstruction, effectively suppressing noise caused by outliers.

Experimental Results

Quantitative results of camera pose estimation on the ETH3D dataset. The best results are highlighted in bold.

Method RRE ↓
[deg.]
RTE ↓
[deg.]
AUC@5 ↑
[%]
SfM rate
[%]
COLMAP 0.655 2.645 90.7 87
DFSfM 2.298 3.711 68.0 85
VGGSfM 22.439 17.220 52.7 98
VGGT 2.485 8.806 35.4 100
MASt3R-SfM 2.572 3.343 75.7 100
G-MASt3R-SfM (Ours) 0.474 0.978 93.9 97

BibTeX

@article{Watanabe-ICIP-2026,
  title={G-MASt3R-SfM: Graph-based View Pruning and Multi-stage Optimization for Robust SfM},
  author={Toshiki Watanabe and Shintaro Ito and Natsuki Takama and Koichi Ito and Takafumi Aoki},
  journal={IEEE International Conference on Image Processing},
  year={2026},
  url={https://gsisaoki.github.io/G-MASt3R-SfM/}
}