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1 October 2011 Orientation identification of the power spectrum
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The image Fourier transform is widely used for defocus and astigmatism correction in electron microscopy. The shape of a power spectrum (the square of a modulus of image Fourier transform) is directly related to the three microscope controls, namely, defocus and twofold (two-parameter) astigmatism. We propose a new method for power-spectrum orientation identification. The method is based on the three measures that are related to the microscope's controls. The measures are derived from the mathematical moments of the power spectrum and is tested with the help of a Gaussian benchmark, as well as with the scanning electron microscopy experimental images. The method can be used as an assisting tool for increasing the capabilities of defocus and astigmatism correction a of nonexperienced scanning electron microscopy user, as well as a basis for automated application.
©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)
Maria E. Rudnaya, Robert M. Mattheij, Joseph M. Maubach, and Hennie G. ter Morsche "Orientation identification of the power spectrum," Optical Engineering 50(10), 103201 (1 October 2011).
Published: 1 October 2011

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