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

In this study, we investigate the effectiveness of noise reduction in electron holography, based on the wavelet hidden Markov model (WHMM), which allows the reasonable separation of weak signals from noise. Electron holography observations from a Nd 2 Fe 14 B thin foil showed that the noise reductio...

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Bibliographic Details
Published in:Applied microscopy 2024-04, Vol.54 (1), p.4-4, Article 4
Main Authors: Lee, Sujin, Midoh, Yoshihiro, Tomita, Yuto, Tamaoka, Takehiro, Auchi, Mitsunari, Sasaki, Taisuke, Murakami, Yasukazu
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Electron holography
Electrons
Fourier transforms
Holography
Interference fringes
Markov chains
Materials Science
Microscopy
Nd-Fe-B magnet
Noise reduction
Phase retrieval
Signal to noise ratio
Spatial discrimination
Spatial resolution
Wavelet hidden Markov model
Wavelet transforms
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Summary:In this study, we investigate the effectiveness of noise reduction in electron holography, based on the wavelet hidden Markov model (WHMM), which allows the reasonable separation of weak signals from noise. Electron holography observations from a Nd 2 Fe 14 B thin foil showed that the noise reduction method suppressed artificial phase discontinuities generated by phase retrieval. From the peak signal-to-noise ratio, it was seen that the impact of denoising was significant for observations with a narrow spacing of interference fringes, which is a key parameter for the spatial resolution of electron holography. These results provide essential information for improving the precision of electron holography studies.
ISSN:2287-4445
2287-5123
2287-4445
DOI:10.1186/s42649-024-00097-w