REINFORCEMENT LEARNING
COMPUTER VISION
Solving General Noisy Inverse Problem via Posterior Sampling: A Policy Gradient Viewpoint
May 06, 2024
Abstract
Solving image inverse problems (e.g., super- resolution and inpainting) requires generat- ing a high fidelity image that matches the given input (the low-resolution image or the masked image). By using the input image as guidance, we can leverage a pretrained diffu- sion generative model to solve a wide range of image inverse tasks without task specific model fine-tuning. To precisely estimate the guidance score function of the input image, we propose Diffusion Policy Gradient (DPG), a tractable computation method by viewing the intermediate noisy images as policies and the target image as the states selected by the policy. Experiments show that our method is robust to both Gaussian and Poisson noise degradation on multiple linear and non-linear inverse tasks, resulting into a higher image restoration quality on FFHQ, ImageNet and LSUN datasets.
AUTHORS
Publisher
AISTATS
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