Figure 4
From: High-speed Fourier ptychographic microscopy based on programmable annular illuminations
Characterization of a microlens array to evaluate the phase recovery accuracy of AIFPM. (A) The full FOV of one raw low resolution image. (B) The enlarged red-boxed region of one microlens in the middle of the FOV and 8 raw images for the same microlens corresponding to 8 different illumination directions with the same NA ill = 0.4. (C–E) The intensity, Fourier spectrum, and quantitative phase image reconstructed using AIFPM with 12 images. (F) The thickness profiles for the microlens taken along the blue dashed line in (E) using digital holography, ordinary FPM, and AIFPM.
