Micro-macro Gaussian Splatting with Enhanced Scalability for Unconstrained Scene Reconstruction
This addresses the challenge of scalable 3D reconstruction for unconstrained scenes, offering improvements for applications like urban modeling, but appears incremental as it builds on Gaussian splatting with novel components.
The paper tackles the problem of reconstructing 3D scenes from unconstrained image collections with appearance variations, proposing SMW-GS, which significantly outperforms existing methods in reconstruction quality and scalability, particularly in large-scale urban environments with challenging illumination.
Reconstructing 3D scenes from unconstrained image collections poses significant challenges due to variations in appearance. In this paper, we propose Scalable Micro-macro Wavelet-based Gaussian Splatting (SMW-GS), a novel method that enhances 3D reconstruction across diverse scales by decomposing scene representations into global, refined, and intrinsic components. SMW-GS incorporates the following innovations: Micro-macro Projection, which enables Gaussian points to sample multi-scale details with improved diversity; and Wavelet-based Sampling, which refines feature representations using frequency-domain information to better capture complex scene appearances. To achieve scalability, we further propose a large-scale scene promotion strategy, which optimally assigns camera views to scene partitions by maximizing their contributions to Gaussian points, achieving consistent and high-quality reconstructions even in expansive environments. Extensive experiments demonstrate that SMW-GS significantly outperforms existing methods in both reconstruction quality and scalability, particularly excelling in large-scale urban environments with challenging illumination variations. Project is available at https://github.com/Kidleyh/SMW-GS.