Fig. 6.

Adding intensity measurements from different Z₂ distances does not degrade the image resolution. An important question that we aimed to address with this additional experiment was whether or not the digital cross registration process among different height lensfree holograms results in spatial smearing of our reconstructed images. Therefore we compared the imaging performance of our multi-height reconstruction results against a single back-propagated super resolved hologram. (a) Single height based back propagated PSR amplitude image. (b), (c), (d) and (e) are multi-height based PSR lensfree amplitude images, where two, three, four and five different heights were used in the reconstruction process, respectively (λ = 490nm). For fair comparison the number of Fourier transform pairs was equal in each case, such that each reconstruction used different number of iterations. In all of these reconstructed images, the letters “U” and “C”, with a spacing of ~1 µm, are clearly separated. (f) Microscope comparison image of the same sample (40 × objective lens; 0.65 NA).