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Gradient-based Sharpness Function

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Figure

Figure 1(a) shows the ray diagram, where the objectivelens has one focal point F. The only adjustable parameter
Fig. 2.2(a): typical configuration of electrostatic stigmators [14]; 2(b): asymmetric PSF in Fourier space, schematic representation; 2(c): The imageformation model; 2(d): Sharpness function S reaches its optimum at the in-focus image
Fig. 3.Sharpness functions S shapes.
Fig. 5.Image improvement by a test application implemented in a prototype FEI Tecnai F20 STEM

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