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

Yasukazu Murakami|Sujin Lee|Yoshihiro Midoh|Yuto Tomita|Takehiro Tamaoka|Mitsunari Auchi|Taisuke Sasaki
한국현미경학회 (Korean Society Of Microscopy)|2024.12|Applied Microscopy|제54권 제1호|pp. 1-10|DOI 10.1186/s42649-024-00097-w

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참고문헌

키워드

Noise reductionWavelet hidden Markov modelElectron holographyNd-Fe-B magnet
주제분류자연과학일반

초록

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 Nd2Fe14B 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.

Abstract

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 Nd2Fe14B 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.

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