High accuracy quantitative phase imaging based on transport-of-intensity equation

Abstract

For quantitative phase imaging (QPI) based on transport-of-intensity equation (TIE), the phase obtained by TIE has suffered a lot from the higher-order intensity derivatives caused by large defocus distance and the phase discrepancy caused by Teague assumption. To address these problems and obtain the higher accuracy phase without increasing the number of defocus images, we propose a fast compensation algorithm that requires only a few iterations. We theoretically prove the convergence of our algorithm and the efficiency is verified by experiments. We believe that this method has the characteristics of fast and higher accuracy, which will be conducive to application of QPI.