  Text-driven video generation witnesses rapid progress. However, merely using
text prompts is not enough to depict the desired subject appearance that
accurately aligns with users' intents, especially for customized content
creation. In this paper, we study the task of video generation with image
prompts, which provide more accurate and direct content control beyond the text
prompts. Specifically, we propose a feed-forward framework VideoBooth, with two
dedicated designs: 1) We propose to embed image prompts in a coarse-to-fine
manner. Coarse visual embeddings from image encoder provide high-level
encodings of image prompts, while fine visual embeddings from the proposed
attention injection module provide multi-scale and detailed encoding of image
prompts. These two complementary embeddings can faithfully capture the desired
appearance. 2) In the attention injection module at fine level, multi-scale
image prompts are fed into different cross-frame attention layers as additional
keys and values. This extra spatial information refines the details in the
first frame and then it is propagated to the remaining frames, which maintains
temporal consistency. Extensive experiments demonstrate that VideoBooth
achieves state-of-the-art performance in generating customized high-quality
videos with subjects specified in image prompts. Notably, VideoBooth is a
generalizable framework where a single model works for a wide range of image
prompts with feed-forward pass.
