Towards Extreme Image Compression with Latent Feature Guidance and Diffusion Prior

• URL: http://arxiv.org/abs/2404.18820v4
• Date: Wed, 4 Sep 2024 03:35:58 GMT
• Title: Towards Extreme Image Compression with Latent Feature Guidance and Diffusion Prior
• Authors: Zhiyuan Li, Yanhui Zhou, Hao Wei, Chenyang Ge, Jingwen Jiang,
• Abstract summary: We propose a novel two-stage extreme image compression framework that exploits the powerful generative capability of pre-trained diffusion models. Our method significantly outperforms state-of-the-art approaches in terms of visual performance at extremely lows.
• Score: 8.772652777234315
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Image compression at extremely low bitrates (below 0.1 bits per pixel (bpp)) is a significant challenge due to substantial information loss. In this work, we propose a novel two-stage extreme image compression framework that exploits the powerful generative capability of pre-trained diffusion models to achieve realistic image reconstruction at extremely low bitrates. In the first stage, we treat the latent representation of images in the diffusion space as guidance, employing a VAE-based compression approach to compress images and initially decode the compressed information into content variables. The second stage leverages pre-trained stable diffusion to reconstruct images under the guidance of content variables. Specifically, we introduce a small control module to inject content information while keeping the stable diffusion model fixed to maintain its generative capability. Furthermore, we design a space alignment loss to force the content variables to align with the diffusion space and provide the necessary constraints for optimization. Extensive experiments demonstrate that our method significantly outperforms state-of-the-art approaches in terms of visual performance at extremely low bitrates. The source code and trained models are available at https://github.com/huai-chang/DiffEIC.

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