Defocus Polar rOse Estimation Method (POEM): A Fast Defocus Estimation Method for STEM

Abstract

Abstract-The defocus Polar rOse Estimation Method (POEM) has been introduced recently as an alternative method for defocus estimation in scanning transmission electron microscopy. Its principle of operation is expanded here to include more realistic image models. The details of the expansion are discussed in depth along with the results of new simulation-based performance tests that take into account the effect of measurement noise. The results clearly show that the defocus POEM has the potential to be fast and accurate.