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arXiv · 2404.13866

Plug-and-Play Algorithm Convergence Analysis From The Standpoint of Stochastic Differential Equation

Zhongqi Wang·Bingnan Wang·Maosheng Xiang
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Abstract

The Plug-and-Play (PnP) algorithm is popular for inverse image problem-solving. However, this algorithm lacks theoretical analysis of its convergence with more advanced plug-in denoisers. We demonstrate that discrete PnP iteration can be described by a continuous stochastic differential equation (SDE). We can also achieve this transformation through Markov process formulation of PnP. Then, we can take a higher standpoint of PnP algorithms from stochastic differential equations, and give a unified framework for the convergence property of PnP according to the solvability condition of its corresponding SDE. We reveal that a much weaker condition, bounded denoiser with Lipschitz continuous measurement function would be enough for its convergence guarantee, instead of previous Lipschitz continuous denoiser condition.

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Zhongqi Wang, Bingnan Wang, Maosheng Xiang. 2024-04-22. Plug-and-Play Algorithm Convergence Analysis From The Standpoint of Stochastic Differential Equation. https://arxiv.org/abs/2404.13866

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