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<div class="paper-abstract">3D Gaussian Splatting (3DGS) has shown great potential for efficient reconstruction and high-fidelity real-time rendering of complex scenes on consumer hardware. However, due to its rasterization-based formulation, 3DGS is constrained to ideal pinhole cameras and lacks support for secondary lighting effects. Recent methods address these limitations by tracing volumetric particles instead, however, this comes at the cost of significantly slower rendering speeds. In this work, we propose 3D Gaussian Unscented Transform (3DGUT), replacing the EWA splatting formulation in 3DGS with the Unscented Transform that approximates the particles through sigma points, which can be projected exactly under any nonlinear projection function. This modification enables trivial support of distorted cameras with time dependent effects such as rolling shutter, while retaining the efficiency of rasterization. Additionally, we align our rendering formulation with that of tracing-based methods, enabling secondary ray tracing required to represent phenomena such as reflections and refraction within the same 3D representation.
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<div class="paper-row" data-id="murai2024mast3rslam" data-title="MASt3R-SLAM: Real-Time Dense SLAM with 3D Reconstruction Priors" data-authors="Riku Murai, Eric Dexheimer, Andrew J. Davison" data-year="2024" data-tags='["3ster-based", "SLAM", "Video"]'>
<img data-src="assets/thumbnails/lyu2024resgs.jpg" data-fallback="None" alt="Paper thumbnail for ResGS: Residual Densification of 3D Gaussian for Efficient Detail Recovery" class="lazy" loading="lazy"/>
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<h2 class="paper-title">ResGS: Residual Densification of 3D Gaussian for Efficient Detail Recovery <span class="paper-year">(2024)</span></h2>
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<p class="paper-authors">Yanzhe Lyu, Kai Cheng, Xin Kang, Xuejin Chen</p>
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<div class="paper-abstract">Recently, 3D Gaussian Splatting (3D-GS) has prevailed in novel view synthesis, achieving high fidelity and efficiency. However, it often struggles to capture rich details and complete geometry. Our analysis highlights a key limitation of 3D-GS caused by the fixed threshold in densification, which balances geometry coverage against detail recovery as the threshold varies. To address this, we introduce a novel densification method, residual split, which adds a downscaled Gaussian as a residual. Our approach is capable of adaptively retrieving details and complementing missing geometry while enabling progressive refinement. To further support this method, we propose a pipeline named ResGS. Specifically, we integrate a Gaussian image pyramid for progressive supervision and implement a selection scheme that prioritizes the densification of coarse Gaussians over time. Extensive experiments demonstrate that our method achieves SOTA rendering quality. Consistent performance improvements can be achieved by applying our residual split on various 3D-GS variants, underscoring its versatility and potential for broader application in 3D-GS-based applications.
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<div class="paper-row" data-id="tang2024mvdust3r" data-title="MV-DUSt3R+: Single-Stage Scene Reconstruction from Sparse Views In 2 Seconds" data-authors="Zhenggang Tang, Yuchen Fan, Dilin Wang, Hongyu Xu, Rakesh Ranjan, Alexander Schwing, Zhicheng Yan" data-year="2024" data-tags='["3ster-based", "Code", "Project", "Sparse", "Video"]'>
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