arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.08214eess.IVcs.CVcs.LGeess.SPphysics.ins-det
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DeepInit相位恢复

DeepInit Phase Retrieval

Martin Reiche, Peter Jung

摘要:

本文展示了如何利用数据驱动的深度生成模型来解决具有挑战性的相位恢复问题,其中人们希望仅从少数强度测量中重建信号。经典的迭代算法是已知的工作良好,如果初始化接近最佳,但否则遭受非凸性,往往陷入局部极小值。因此,我们提出了DeepInit相位检索,它在深度生成数据下使用正则化梯度下降,然后计算快速经典算法的训练初始化(例如随机Kaczmarz方法)。我们的经验表明,我们的混合方法是能够提供非常高的重建结果,在低采样率,即使有显着的发电机模型误差。从概念上讲,学习的初始化可能因此有助于通过开始更接近全局最优的经典下降步骤来克服问题的非凸性。此外,我们的想法表现出优越的运行时性能比传统的基于梯度的重建方法。我们评估我们的方法,通用的测量和经验表明,它也适用于衍射型的测量模型,发现在太赫兹单像素相位检索。

英文摘要:

This paper shows how data-driven deep generative models can be utilized to solve challenging phase retrieval problems, in which one wants to reconstruct a signal from only few intensity measurements. Classical iterative algorithms are known to work well if initialized close to the optimum but otherwise suffer from non-convexity and often get stuck in local minima. We therefore propose DeepInit Phase Retrieval, which uses regularized gradient descent under a deep generative data prior to compute a trained initialization for a fast classical algorithm (e.g. the randomized Kaczmarz method). We empirically show that our hybrid approach is able to deliver very high reconstruction results at low sampling rates even when there is significant generator model error. Conceptually, learned initializations may therefore help to overcome the non-convexity of the problem by starting classical descent steps closer to the global optimum. Also, our idea demonstrates superior runtime performance over conventional gradient-based reconstruction methods. We evaluate our method for generic measurements and show empirically that it is also applicable to diffraction-type measurement models which are found in terahertz single-pixel phase retrieval.

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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