DreamBooth Fine Tuning Text-to-Image Diffusion Models for Subject-Driven Generation

This is my reading note on DreamBooth. Given as input just a few images of a subject, we fine-tune a pretrained text-to-image model (Imagen, although our method is not limited to a specific model) such that it learns to bind a unique identifier with that specific subject. Once the subject is embedded in the output domain of the model, the unique identifier can then be used to synthesize fully-novel photorealistic images of the subject contextualized in different scenes. By leveraging the semantic prior embedded in the model with a new autogenous class-specific prior preservation loss, our technique enables synthesizing the subject in diverse scenes, poses, views, and lighting conditions that do not appear in the reference images.

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MovieChat From Dense Token to Sparse Memory for Long Video Understanding

This is my reading note on MovieChat: From Dense Token to Sparse Memory for Long Video Understanding. This paper proposes a method for long video understands it utilizes existing image encoder to extract tokens form the video via sliding window. A short term memory is a FIFO of those tokens, a long term memory is to merge the similar tokens. Those short term memory and long term memory are then appended after the question and feed to the LLM. The alignment of visual features to LLM purely depends on the existing image encoder.

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TokenFlow Consistent Diffusion Features for Consistent Video Editing

This is my reading note on TokenFlow Consistent Diffusion Features for Consistent Video Editing, which is diffusion based on video editing method. This paper proposes a method to edit a video given text prompt. To do this, the paper relies on two things. First, it extracts bey lames from video and perform image on those key frames jointly. In addition, the paper found that the feature in diffusion has strong correspondence to the pixels. As a results it propose to propagate the features of edited key frames to other frames, accord to the correspondence in the original video.

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