Maximum a posteriori-based digital holographic microscopy for high-resolution phase reconstruction of a micro-lens array

Abstract

A novel approach is presented for improving phase reconstruction in digital holographic microscopy. In this process, a maximum a posteriori (MAP) image restoration technique is combined with a digital holographic phase reconstruction algorithm and used to extract the three-dimensional phase of a measured sample. High-resolution restoration of a digital hologram was first performed using the MAP method, a digital holographic microscopy device, and a USAF1951 resolution plate. The low- and high-resolution holograms were then used, in combination with a micro-lens array, to reconstruct corresponding phase information. Experimental results indicated the peak-to-valley (PV) and root-mean-square (RMS) values for the phase data, reconstructed using a super-resolution hologram, were respectively 31% and 59% lower than that of the low-resolution hologram. This suggests the proposed technique could enhance hologram resolution and reduce noise in reconstructed phase information.