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Applied Microscopy
Fig. 5 | Applied Microscopy

Fig. 5

From: Noise reduction of electron holography observations for a thin-foiled Nd-Fe-B specimen using the wavelet hidden Markov model

Fig. 5

Evaluation of the denoising effect using peak signal-to-noise ratio (PSNR). a Reference-measurement phase image for the fringe spacing s \(=\) 2.4 nm. PSNR was determined for the area indicated by the yellow lines. b PSNR as functions of the upper biprism voltage VBP1 (lower horizontal axis) and the fringe spacing (upper horizontal axis). Open and closed squares indicate PSNR values determined from the original phase images (including noise) and the noise-reduced (denoised) phase images, respectively. c Difference between the PSNR for the denoised images (closed squares) and original phase images (open squares) as function of VBP1 (lower horizontal axis) and s (upper horizontal axis). d Noised (left) and denoised (right) images obtained at s \(=\) 2.4 nm. The black dotted lines in (a) indicate the enlarged areas in (d)

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