RT Journal Article SR Electronic T1 SAVI: Synthetic apertures for long-range, subdiffraction-limited visible imaging using Fourier ptychography JF Science Advances JO Sci Adv FD American Association for the Advancement of Science SP e1602564 DO 10.1126/sciadv.1602564 VO 3 IS 4 A1 Holloway, Jason A1 Wu, Yicheng A1 Sharma, Manoj K. A1 Cossairt, Oliver A1 Veeraraghavan, Ashok YR 2017 UL http://advances.sciencemag.org/content/3/4/e1602564.abstract AB 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.