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Quantitative phase imaging is widely studied for such as bio-imaging and industrial inspection. Quantitative phase imaging is divided into interferometric approach and non-interferometric intensity-based one. Interferometry often uses object and reference arms, rendering an optical setup complicated. The transport of intensity equation has been used for non-interferometric quantitative phase imaging. It allows to retrieve a phase distribution from through-focus series of an object. To obtain through-focus series, mechanical scanning of the object or a camera is required. This is not suitable for the quantitative phase imaging of dynamic phenomena. In this presentation, some of our proposed scan-less methods are presented. Numerical and/or experimental results are also shown.
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