Lumiere: A Space-Time Diffusion Model for Video Generation (Paper Explained)

#lumiere #texttovideoai #google

LUMIERE by Google Research tackles globally consistent text-to-video generation by extending the U-Net downsampling concept to the temporal axis of videos.

OUTLINE: 0:00 - Introduction 8:20 - Problems with keyframes 16:55 - Space-Time U-Net (STUNet) 21:20 - Extending U-Nets to video 37:20 - Multidiffusion for SSR prediction fusing 44:00 - Stylized generation by swapping weights 49:15 - Training & Evaluation 53:20 - Societal Impact & Conclusion

Paper: https://arxiv.org/abs/2401.12945 Website: https://lumiere-video.github.io/

Abstract: We introduce Lumiere -- a text-to-video diffusion model designed for synthesizing videos that portray realistic, diverse and coherent motion -- a pivotal challenge in video synthesis. To this end, we introduce a Space-Time U-Net architecture that generates the entire temporal duration of the video at once, through a single pass in the model. This is in contrast to existing video models which synthesize distant keyframes followed by temporal super-resolution -- an approach that inherently makes global temporal consistency difficult to achieve. By deploying both spatial and (importantly) temporal down- and up-sampling and leveraging a pre-trained text-to-image diffusion model, our model learns to directly generate a full-frame-rate, low-resolution video by processing it in multiple space-time scales. We demonstrate state-of-the-art text-to-video generation results, and show that our design easily facilitates a wide range of content creation tasks and video editing applications, including image-to-video, video inpainting, and stylized generation.

Authors: Omer Bar-Tal, Hila Chefer, Omer Tov, Charles Herrmann, Roni Paiss, Shiran Zada, Ariel Ephrat, Junhwa Hur, Yuanzhen Li, Tomer Michaeli, Oliver Wang, Deqing Sun, Tali Dekel, Inbar Mosseri

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