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arXiv 0910.4887math.OC
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基于可变分裂和约束Optimization的快速图像恢复

Fast Image Recovery Using Variable Splitting and Constrained Optimization

Manya V. Afonso, José M. Bioucas-Dias, Mário A. T. Figueiredo

摘要:

我们提出了一种新的快速算法来解决图像恢复和重建的标准公式之一,其中包括一个无约束的最优化问题,目标包括一个$\ell_2$数据保真度项和一个非光滑正则化。该公式允许基于小波(具有正交或基于帧的表示)的正则化或全变差正则化。我们的方法是基于变量分裂,以获得一个等价的约束优化配方,然后与增广拉格朗日方法。该算法是所谓的“乘子交替方向法”的一个例子,其收敛性已被证明。一组图像恢复和重建基准问题的实验表明,该算法比目前的最先进的方法是快速的。

英文摘要:

We propose a new fast algorithm for solving one of the standard formulations of image restoration and reconstruction which consists of an unconstrained optimization problem where the objective includes an $\ell_2$ data-fidelity term and a non-smooth regularizer. This formulation allows both wavelet-based (with orthogonal or frame-based representations) regularization or total-variation regularization. Our approach is based on a variable splitting to obtain an equivalent constrained optimization formulation, which is then addressed with an augmented Lagrangian method. The proposed algorithm is an instance of the so-called "alternating direction method of multipliers", for which convergence has been proved. Experiments on a set of image restoration and reconstruction benchmark problems show that the proposed algorithm is faster than the current state of the art methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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