Research ArticleAPPLIED OPTICS

SAVI: Synthetic apertures for long-range, subdiffraction-limited visible imaging using Fourier ptychography

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Science Advances  14 Apr 2017:
Vol. 3, no. 4, e1602564
DOI: 10.1126/sciadv.1602564

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Abstract

Synthetic aperture radar is a well-known technique for improving resolution in radio imaging. Extending these synthetic aperture techniques to the visible light domain is not straightforward because optical receivers cannot measure phase information. We propose to use macroscopic Fourier ptychography (FP) as a practical means of creating a synthetic aperture for visible imaging to achieve subdiffraction-limited resolution. We demonstrate the first working prototype for macroscopic FP in a reflection imaging geometry that is capable of imaging optically rough objects. In addition, a novel image space denoising regularization is introduced during phase retrieval to reduce the effects of speckle and improve perceptual quality of the recovered high-resolution image. Our approach is validated experimentally where the resolution of various diffuse objects is improved sixfold.

Keywords
  • Computational Imaging
  • Fourier Ptychography
  • Phase Retrieval
  • Synthetic Aperture Imaging

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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