Macroscopic subdiffraction Fourier ptychography imaging based on the camera array

As a type of computational optical imaging technology, Fourier ptychography (FP) imaging technology combines phase recovery algorithm with the idea of synthetic aperture. It is oriented towards a large field of view and high resolution. However, there are still two issues that need to be addressed. First, there is the problem of slow speed of image acquisition and long acquisition time. The large synthetic aperture and high overlap rate between adjacent images significantly increase the number of collected images. Second, for the transmissive FP imaging, when the intensity of the illumination source is constant, the theoretical synthetic aperture size cannot increase unlimited with the increase of the scanning range of the camera array in the focal plane. Therefore, in this paper, we adopt a 3×3 camera array for data acquisition, reducing the data acquisition speed to one-ninth under the same conditions, greatly improving the imaging speed; research was conducted on the transmissive FP imaging experiment, which achieved a 7-fold resolution improvement; At the same time, through system simulation and reverse derivation of experimental results, the actual effective synthetic aperture size was determined under certain lighting source power conditions. Our work has laid the foundation for further imaging distances in the future and contributed new methods for fast subdiffraction computed imaging.