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The Clip Model Is an Image-to-Prompt Converter (arxiv.org)
1 point by rahimnathwani on May 26, 2023 | hide | past | pdf | discuss on HN

In plain words: A math trick turns Stable Diffusion's image reader into a picture-to-prompt converter, so an image becomes a text prompt with no training. About 100 images, or a few dozen steps, sharpen it for copying and editing images, rather than the usual millions-of-images training.

Abstract · The CLIP Model is Secretly an Image-to-Prompt Converter

The Stable Diffusion model is a prominent text-to-image generation model that relies on a text prompt as its input, which is encoded using the Contrastive Language-Image Pre-Training (CLIP). However, text prompts have limitations when it comes to incorporating implicit information from reference images. Existing methods have attempted to address this limitation by employing expensive training procedures involving millions of training samples for image-to-image generation. In contrast, this paper demonstrates that the CLIP model, as utilized in Stable Diffusion, inherently possesses the ability to instantaneously convert images into text prompts. Such an image-to-prompt conversion can be achieved by utilizing a linear projection matrix that is calculated in a closed form. Moreover, the paper showcases that this capability can be further enhanced by either utilizing a small amount of similar-domain training data (approximately 100 images) or incorporating several online training steps (around 30 iterations) on the reference images. By leveraging these approaches, the proposed method offers a simple and flexible solution to bridge the gap between images and text prompts. This methodology can be applied to various tasks such as image variation and image editing, facilitating more effective and seamless interaction between images and textual prompts.

Yuxuan Ding, Chunna Tian, Haoxuan Ding, Lingqiao Liu
arXiv:2305.12716 · cs.CV · submitted May 22, 2023 · updated Feb 15, 2024
abstract · pdf · html · Accepted by NeurIPS 2023, 21 pages, 28 figures

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