Wavefront reconstruction with denoising using lateral displacements of a random phase mask

Abstract

A technique for enhanced wavefront reconstruction using laterally displaced random phase mask and image denoising is described. A complex-amplitude test object is illuminated with a partially-developed speckle field. Phase-shifting of a part of the spatial frequency spectrum on a spatial light modulator is simulated and the four-bucket algorithm is used to reconstruct the object wave. Speckle noise in the reconstruction is addressed by synthesizing the images obtained corresponding to lateral displacements of a phase diffuser. Using the sum of five sets of phase-shifted images shows qualitative improvement in the reconstruction. © 2013 Samahang Pisika ng Pilipinas.