Fig. 12: Experimental images from MgO after denoiser preprocessing.
From: Unsupervised deep denoising for four-dimensional scanning transmission electron microscopy
a Raw data from an on-axis point detector (0.4 mrad collection angle; indicated by the red mark on the inset PACBED pattern), synthesised from experimental 4D STEM data from an MgO smoke sample. b Equivalent image after denoising of the 4D STEM data, in which more detailed structure (an example of which is indicated by the black arrow) is clearly evident. c Standard deviation and (d) average value of the pixels in the bright field region of each CBED pattern displayed as a histograms of the distribution across the probe positions along the red line scan region in (b). The average values are seen to be largely unchanged upon denoising, whereas the standard deviation has reduced significantly. e CBED patterns from the orange line scan in (a) show local visual features become distinguishable in the denoised dataset.
