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Multigrid Optimization for Large-Scale Ptychographic Phase Retrieval. (arXiv:1810.05628v1 [math.NA])
来源于:arXiv
Ptychography is a popular imaging technique that combines diffractive imaging
with scanning microscopy. The technique consists of a coherent beam that is
scanned across an object in a series of overlapping positions, leading to
reliable and improved phase reconstruction. Computationally, ptychography is
extremely expensive, as ptychographic microscopes allow for large fields to be
imaged at high resolution. In this work, we propose a multigrid-based
optimization framework to reduce the computational burdens of large-scale
ptychographic phase retrieval. Our proposed method exploits the inherent
hierarchical structures in ptychography through tailored restriction and
prolongation operators for the object and data domains. Our numerical results
show that our proposed scheme accelerates the convergence of its underlying
solver and outperforms the state-of-the-art method in the optics community. 查看全文>>