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The paper introduces AA-Splat, a feed-forward 3D Gaussian Splatting model designed for robust anti-aliased rendering at arbitrary resolutions. AA-Splat employs an opacity-balanced band-limiting (OBBL) design, integrating multi-view frequency bounds and opacity balancing to eliminate rendering artifacts caused by incorrect screen-space dilation filters in existing methods. Experiments demonstrate significant improvements in novel view synthesis, achieving 5.4-7.5dB PSNR gains over DepthSplat across various resolutions.
Rendering artifacts in feed-forward 3D Gaussian Splatting? Solved: AA-Splat delivers a whopping 7dB PSNR boost by fixing screen-space dilation filters.
Feed-forward 3D Gaussian Splatting (FF-3DGS) emerges as a fast and robust solution for sparse-view 3D reconstruction and novel view synthesis (NVS). However, existing FF-3DGS methods are built on incorrect screen-space dilation filters, causing severe rendering artifacts when rendering at out-of-distribution sampling rates. We firstly propose an FF-3DGS model, called AA-Splat, to enable robust anti-aliased rendering at any resolution. AA-Splat utilizes an opacity-balanced band-limiting (OBBL) design, which combines two components: a 3D band-limiting post-filter integrates multi-view maximal frequency bounds into the feed-forward reconstruction pipeline, effectively band-limiting the resulting 3D scene representations and eliminating degenerate Gaussians; an Opacity Balancing (OB) to seamlessly integrate all pixel-aligned Gaussian primitives into the rendering process, compensating for the increased overlap between expanded Gaussian primitives. AA-Splat demonstrates drastic improvements with average 5.4$\sim$7.5dB PSNR gains on NVS performance over a state-of-the-art (SOTA) baseline, DepthSplat, at all resolutions, between $4\times$ and $1/4\times$. Code will be made available.
