Zero-Shot Low Light Image Enhancement with Diffusion Prior
This provides a simple, effective solution for low-light image enhancement, applicable in photography and vision tasks, though it is incremental as it adapts existing diffusion models.
The paper tackles low-light image enhancement by using a pre-trained text-to-image diffusion prior without training or optimization, achieving superior fidelity and outperforming state-of-the-art methods on established datasets with enhanced color accuracy.
In this paper, we present a simple yet highly effective "free lunch" solution for low-light image enhancement (LLIE), which aims to restore low-light images as if acquired in well-illuminated environments. Our method necessitates no optimization, training, fine-tuning, text conditioning, or hyperparameter adjustments, yet it consistently reconstructs low-light images with superior fidelity. Specifically, we leverage a pre-trained text-to-image diffusion prior, learned from training on a large collection of natural images, and the features present in the model itself to guide the inference, in contrast to existing methods that depend on customized constraints. Comprehensive quantitative evaluations demonstrate that our approach outperforms SOTA methods on established datasets, while qualitative analyses indicate enhanced color accuracy and the rectification of subtle chromatic deviations. Furthermore, additional experiments reveal that our method, without any modifications, achieves SOTA-comparable performance in the auto white balance (AWB) task.