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Solving General Noisy Inverse Problem via Posterior Sampling: A Policy Gradient Viewpoint
March 19, 2024, 4:42 a.m. | Haoyue Tang, Tian Xie, Aosong Feng, Hanyu Wang, Chenyang Zhang, Yang Bai
cs.LG updates on arXiv.org arxiv.org
Abstract: Solving image inverse problems (e.g., super-resolution and inpainting) requires generating 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 diffusion 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 …
abstract arxiv cs.ai cs.cv cs.lg diffusion eess.iv fidelity general generative gradient guidance image inpainting low policy posterior sampling solve type via
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