Long-LRM: Long-sequence Large Reconstruction Model for Wide-coverage Gaussian Splats

ICLR 2025 Conference Submission4070 Authors

Keywords: 3D Reconstruction

TL;DR: Enabling high-quality large-scene 3D Gaussian reconstruction in 1.3 seconds.

Abstract:

We propose Long-LRM, a generalizable 3D Gaussian reconstruction model that is capable of reconstructing a large scene from
a long sequence of input images. Specifically, our model can process 32 source images at 960$\times$540 resolution within only 1.3 seconds on a single A100 80G GPU. Our architecture features a mixture of the recent Mamba2 blocks and the classical transformer blocks which allowed many more tokens to be processed than prior work, enhanced by efficient token merging and Gaussian pruning steps that balance between quality and efficiency. Unlike previous generalizable 3D GS models that are limited to taking 1$\sim$4 input images and can only reconstruct a small portion of a large scene, Long-LRM reconstructs the entire scene in a single feed-forward step. On large-scale scene datasets such as DL3DV-140 and Tanks and Temples, our method achieves performance comparable to optimization-based approaches while being two orders of magnitude more efficient.

Primary Area: applications to computer vision, audio, language, and other modalities

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Submission Number: 4070