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arXiv 2109.08591cs.CV
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从一个视频中生成多种视频成为可能

Diverse Generation from a Single Video Made Possible

Weizmann Institute of Science(魏茨曼科学研究所)

Niv Haim, Ben Feinstein, Niv Granot, Assaf Shocher, Shai Bagon, Tali Dekel, Michal Irani

摘要:

GANs能够执行生成和操纵任务,并在单个视频上进行训练。然而,这些单视频GANs需要不合理的时间量来对单个视频进行训练,使得它们几乎不切实际。在本文中,我们质疑的必要性,一个GAN从一个单一的视频生成,并介绍了各种生成和操作任务的非参数基线。我们恢复经典的时空补丁最近邻方法,并使其适应一个可扩展的无条件生成模型,没有任何学习。这个简单的基线在视觉质量和真实感方面令人惊讶地优于单视频GANs(通过定量和定性评估证实),并且不成比例地更快(运行时间从几天减少到几秒)。除了不同的视频生成,我们展示了其他应用程序使用相同的框架,包括视频类比和时空重定向。我们提出的方法很容易扩展到全高清视频。这些观察结果表明,经典方法,如果适应正确,在这些任务中显着优于重型深度学习机器。这为单视频生成和操作任务设定了一个新的基准,同样重要的是--使从单个视频生成多种视频第一次成为可能。

英文摘要:

GANs are able to perform generation and manipulation tasks, trained on a single video. However, these single video GANs require unreasonable amount of time to train on a single video, rendering them almost impractical. In this paper we question the necessity of a GAN for generation from a single video, and introduce a non-parametric baseline for a variety of generation and manipulation tasks. We revive classical space-time patches-nearest-neighbors approaches and adapt them to a scalable unconditional generative model, without any learning. This simple baseline surprisingly outperforms single-video GANs in visual quality and realism (confirmed by quantitative and qualitative evaluations), and is disproportionately faster (runtime reduced from several days to seconds). Other than diverse video generation, we demonstrate other applications using the same framework, including video analogies and spatio-temporal retargeting. Our proposed approach is easily scaled to Full-HD videos. These observations show that the classical approaches, if adapted correctly, significantly outperform heavy deep learning machinery for these tasks. This sets a new baseline for single-video generation and manipulation tasks, and no less important -- makes diverse generation from a single video practically possible for the first time.

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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