Transport of intensity equation (TIE) is a non-interferometric and non-iterative quantitative phase imaging technique that utilizes multiple intensity recordings along the propagation direction. Apart from many advantages, it has some experimental and numerical challenges as well. The experimental challenge is the requirement of multiple intensity recordings which prohibit TIE for real-time imaging of dynamic samples. The numerical challenge is to work with boundary conditions in post-processing analysis. It is required because phase information is to be retrieved after solving second order partial differential equation relating the intensity derivative with phase. In recent years, we have worked on solving the experimental challenges such as alleviating the need of multiple intensity recordings along-with some applications of TIE.
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