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arXiv 1507.08413math.OC
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求解复合最优化问题的分裂原-对偶邻近算法

A splitting primal-dual proximity algorithm for solving composite optimization problems

Yu-Chao Tang, Chuan-Xi Zhu, Meng Wen, Ji-Gen Peng

摘要:

研究了非光滑凸函数与有限族复合凸函数之和的优化问题,其中每一个复合凸函数都由一个凸函数和一个有界线性算子组成.这种类型的问题与图像恢复和图像重建领域中遇到的许多有趣的挑战相关联。我们开发了一个分裂原始-对偶邻近算法来解决这个问题。此外,我们提出了一种预条件方法,该方法的迭代参数是在不需要事先知道某些特定的算子范数的情况下获得的。理论收敛定理。然后,我们应用所提出的方法来解决全变差正则化模型,其中L2数据误差函数被添加到L1数据误差函数。该模型的主要优点是它能够组合不同的损失函数。计算机断层扫描(CT)图像重建得到的数值结果表明,该算法能够重建图像的投影视图少,稀疏,同时保持图像质量。

英文摘要:

Our work considers the optimization of the sum of a non-smooth convex function and a finite family of composite convex functions, each one of which is composed of a convex function and a bounded linear operator. This type of problem is associated with many interesting challenges encountered in the image restoration and image reconstruction fields. We developed a splitting primal-dual proximity algorithm to solve this problem. Further, we propose a preconditioned method, of which the iterative parameters are obtained without the need to know some particular operator norm in advance. Theoretical convergence theorems are presented. We then apply the proposed methods to solve a total variation regularization model, in which the L2 data error function is added to the L1 data error function. The main advantageous feature of this model is its capability to combine different loss functions. The numerical results obtained for computed tomography (CT) image reconstruction demonstrated the ability of the proposed algorithm to reconstruct an image with few and sparse projection views while maintaining the image quality.

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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