VEnhancer: Generative Space-Time Enhancement for Video Generation

• URL: http://arxiv.org/abs/2407.07667v1
• Date: Wed, 10 Jul 2024 13:46:08 GMT
• Title: VEnhancer: Generative Space-Time Enhancement for Video Generation
• Authors: Jingwen He, Tianfan Xue, Dongyang Liu, Xinqi Lin, Peng Gao, Dahua Lin, Yu Qiao, Wanli Ouyang, Ziwei Liu,
• Abstract summary: VEnhancer improves the existing text-to-video results by adding more details in spatial domain and synthetic detailed motion in temporal domain. We train a video ControlNet and inject it to the diffusion model as a condition on low frame-rate and low-resolution videos. VEnhancer surpasses existing state-of-the-art video super-resolution and space-time super-resolution methods in enhancing AI-generated videos.
• Score: 123.37212575364327
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present VEnhancer, a generative space-time enhancement framework that improves the existing text-to-video results by adding more details in spatial domain and synthetic detailed motion in temporal domain. Given a generated low-quality video, our approach can increase its spatial and temporal resolution simultaneously with arbitrary up-sampling space and time scales through a unified video diffusion model. Furthermore, VEnhancer effectively removes generated spatial artifacts and temporal flickering of generated videos. To achieve this, basing on a pretrained video diffusion model, we train a video ControlNet and inject it to the diffusion model as a condition on low frame-rate and low-resolution videos. To effectively train this video ControlNet, we design space-time data augmentation as well as video-aware conditioning. Benefiting from the above designs, VEnhancer yields to be stable during training and shares an elegant end-to-end training manner. Extensive experiments show that VEnhancer surpasses existing state-of-the-art video super-resolution and space-time super-resolution methods in enhancing AI-generated videos. Moreover, with VEnhancer, exisiting open-source state-of-the-art text-to-video method, VideoCrafter-2, reaches the top one in video generation benchmark -- VBench.

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