Multiple phase extraction using graphics processing unit assisted unitary transformation method in digital holographic interferometry

Abstract

The article presents a method to estimate multiple phase maps from a moiré fringe signal obtained using digital holographic interferometry. The proposed method uses a unitary transformation based signal subspace approach, and shows high robustness against noise. In addition, the method facilitates the estimation of multiple phase maps in a single shot operation without the need for spectral filtering or multiple images. The computational efficiency of the method was improved by a high performance implementation using a graphics processing unit. The practical utility of the proposed method is demonstrated using simulation and experiment results.