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arXiv 2405.16645cs.CV
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Diffusion4D:通过视频扩散模型实现快速时空一致的4D生成

Diffusion4D: Fast Spatial-temporal Consistent 4D Generation via Video Diffusion Models

University of Texas at Austin(德克萨斯大学奥斯汀分校);University of Cambridge(剑桥大学);University of Toronto(多伦多大学);Beijing Jiaotong University(北京交通大学)

Hanwen Liang, Yuyang Yin, Dejia Xu, Hanxue Liang, Zhangyang Wang, Konstantinos N. Plataniotis, Yao Zhao, Yunchao Wei

AI总结:

本文提出Diffusion4D框架,通过迁移视频扩散模型的时间一致性到4D生成,利用动态3D数据集和运动幅度指导,实现快速、时空一致的4D内容生成,效率与一致性超越现有方法。

摘要:

大规模多模态数据集的可用性和扩散模型的进步显著加速了4D内容生成的发展。大多数先前的方法依赖于多个图像或视频扩散模型,利用分数蒸馏采样进行优化或生成伪新颖视图用于直接监督。然而,这些方法受到优化速度慢和多视图不一致问题的阻碍。4D几何中的空间和时间一致性已分别在3D感知扩散模型和传统单目视频扩散模型中得到广泛探索。在此基础上,我们提出了一种策略,将视频扩散模型中的时间一致性迁移到4D生成所需的时空一致性中。具体来说,我们提出了一个新颖的框架Diffusion4D,用于高效且可扩展的4D内容生成。利用精心策划的动态3D数据集,我们开发了一个4D感知的视频扩散模型,能够合成动态3D资产的轨道视图。为了控制这些资产的动态强度,我们引入了一个3D到4D的运动幅度度量作为指导。此外,我们提出了一种新颖的运动幅度重建损失和3D感知的无分类器指导,以细化运动动态的学习和生成。在获得4D资产的轨道视图后,我们使用高斯泼溅以从粗到细的方式进行显式4D构建。合成的多视图一致的4D图像集使我们能够在几分钟内快速生成高保真且多样化的4D资产。大量实验表明,在各种提示模态下,我们的方法在生成效率和4D几何一致性方面超越了先前的最先进技术。

英文摘要:

The availability of large-scale multimodal datasets and advancements in diffusion models have significantly accelerated progress in 4D content generation. Most prior approaches rely on multiple image or video diffusion models, utilizing score distillation sampling for optimization or generating pseudo novel views for direct supervision. However, these methods are hindered by slow optimization speeds and multi-view inconsistency issues. Spatial and temporal consistency in 4D geometry has been extensively explored respectively in 3D-aware diffusion models and traditional monocular video diffusion models. Building on this foundation, we propose a strategy to migrate the temporal consistency in video diffusion models to the spatial-temporal consistency required for 4D generation. Specifically, we present a novel framework, \textbf{Diffusion4D}, for efficient and scalable 4D content generation. Leveraging a meticulously curated dynamic 3D dataset, we develop a 4D-aware video diffusion model capable of synthesizing orbital views of dynamic 3D assets. To control the dynamic strength of these assets, we introduce a 3D-to-4D motion magnitude metric as guidance. Additionally, we propose a novel motion magnitude reconstruction loss and 3D-aware classifier-free guidance to refine the learning and generation of motion dynamics. After obtaining orbital views of the 4D asset, we perform explicit 4D construction with Gaussian splatting in a coarse-to-fine manner. The synthesized multi-view consistent 4D image set enables us to swiftly generate high-fidelity and diverse 4D assets within just several minutes. Extensive experiments demonstrate that our method surpasses prior state-of-the-art techniques in terms of generation efficiency and 4D geometry consistency across various prompt modalities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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