Fig. 2
From: Investigation of rectangular apertures and their application on speckle imaging
a The PSF for the aperture shown in the Fig. 1a, in the range from 460 to 560 pixels. The cut-off for the central lope = 55 pixels while the central peak at 54 pixels. FWHM = 1 pixels. b The PSF for the aperture shown in the Fig. 1b, in the range from 460 to 560 pixels. The cut-off for the central lope = 55 pixels while the central peak at 54 pixels. FWHM = 1 pixels. c The PSF for the aperture shown in the Fig. 1c, in the range from 460 to 560 pixels. The cut-off for the central lope = 55 pixels while the central peak at 54 pixels. FWHM = 1 pixels. The side lobes are strengthen compared with that shown in the figure (b). d The PSF for the whole aperture shown in the Fig. 1d, in the same range as in the figure (b). The cut-off for the central lope = 57 pixels while the central peak at 54 pixels. FWHM = 3 pixels