Experimental robustness of Fourier ptychography phase retrieval algorithms

Optics Express
Li-Hao YehLaura Waller

Abstract

Fourier ptychography is a new computational microscopy technique that provides gigapixel-scale intensity and phase images with both wide field-of-view and high resolution. By capturing a stack of low-resolution images under different illumination angles, an inverse algorithm can be used to computationally reconstruct the high-resolution complex field. Here, we compare and classify multiple proposed inverse algorithms in terms of experimental robustness. We find that the main sources of error are noise, aberrations and mis-calibration (i.e. model mis-match). Using simulations and experiments, we demonstrate that the choice of cost function plays a critical role, with amplitude-based cost functions performing better than intensity-based ones. The reason for this is that Fourier ptychography datasets consist of images from both brightfield and darkfield illumination, representing a large range of measured intensities. Both noise (e.g. Poisson noise) and model mis-match errors are shown to scale with intensity. Hence, algorithms that use an appropriate cost function will be more tolerant to both noise and model mis-match. Given these insights, we propose a global Newton's method algorithm which is robust and accurate. Finally, we d...Continue Reading

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Citations

Mar 11, 2017·Journal of Biomedical Optics·Yudong YaoJianQiang Zhu
Sep 14, 2017·Journal of Biomedical Optics·An PanBaoli Yao
Feb 7, 2018·Optics Express·Wesley E FarrissA Nick Vamivakas
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Jul 20, 2019·Scientific Reports·Tomas AidukasPaul-Antoine Moreau

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