Fig. 4
From: A hyper-resolving polynomial aperture and its application in microscopy
a Normalized PSF for the first model of polynomial aperture using FFT technique. The total diameter = 32 pixels, and the cut-off spatial frequency is located at Wcut-off = 0.81. b The normalized PSF for the linear aperture using FFT technique. The diameter = 32 pixels, and the cut-off spatial frequency is located at Wcut-off = 0.86. c The normalized PSF for the quadratic aperture using FFT technique. The diameter = 32 pixels, and the cut-off spatial frequency is located at Wcut-off = 0.76. d The normalized PSF for the uniform circular aperture using FFT technique. The diameter = 32 pixels, and the cut-off spatial frequency is located at Wcut-off = 1.0