解决4D高斯点云时间插值的鬼影问题，实现流畅动态场景重建。
RetimeGS: Continuous-Time Reconstruction of 4D Gaussian Splatting
- 通过显式建模高斯点随时间变化的行为，缓解时间混叠问题。
- 在快速运动、非刚性形变数据集上，渲染结果无鬼影且时序一致。
- 适合需要高质量时间编辑的影视后期与慢动作生成场景。
时间重定时能力对于慢速回放、时间编辑和后期制作等应用至关重要。然而，现有4D高斯点云（4DGS）方法在离散帧索引上过拟合，难以表示连续时间帧，导致时间插值时出现鬼影伪影。我们识别此为一种时间混叠现象，并提出RetimeGS——一种简单有效的4DGS表示，显式定义3D高斯点的时间行为以缓解时间混叠。为实现平滑一致的插值，引入光流引导初始化与监督、三重渲染监督等策略。这些组件共同实现了大运动下的无鬼影、时序一致渲染。在包含快速运动、非刚性形变和严重遮挡的数据集上，RetimeGS在质量和时序一致性上均优于当前最优方法。
原文摘要 · Abstract (English)
Temporal retiming, the ability to reconstruct and render dynamic scenes at arbitrary timestamps, is crucial for applications such as slow-motion playback, temporal editing, and post-production. However, most existing 4D Gaussian Splatting (4DGS) methods overfit at discrete frame indices but struggle to represent continuous-time frames, leading to ghosting artifacts when interpolating between timestamps. We identify this limitation as a form of temporal aliasing and propose RetimeGS, a simple yet effective 4DGS representation that explicitly defines the temporal behavior of the 3D Gaussian and mitigates temporal aliasing. To achieve smooth and consistent interpolation, we incorporate optical flow-guided initialization and supervision, triple-rendering supervision, and other targeted strategies. Together, these components enable ghost-free, temporally coherent rendering even under large motions. Experiments on datasets featuring fast motion, non-rigid deformation, and severe occlusions demonstrate that RetimeGS achieves superior quality and coherence over state-of-the-art methods.
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