Lensless super-resolution imaging with Fourier Ptychography reconstruction

Conventional lensless imaging modulates the image with a Fresnel zone aperture (FZA) as a mask and demodulates it with a four-step phase-shift and the virtual FZA. However, limited by the area size of the sensor, the actual diameter of the aperture used cannot be larger than the sensor, which reduces the resolution of the reconstructed image. To solve this problem, we propose a Fourier Ptychography-based lensless super-resolution imaging reconstruction method. By moving the position of the FZA in front of the sensor, the spectrum of the reconstructed image can be shifted in the frequency domain. Filling the extracted real spectrum at different positions in the frequency domain can realize lensless super-resolution imaging reconstruction. It is verified by simulation that our method can improve the resolution by three times compared with previous methods, which indicates that our method has broad application prospects in the field of lensless imaging.