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

Springer Science and Business Media LLC - Tập 54 Số 1
Su-Jin Lee1, Yoshihiro Midoh2, Yoshifumi Tomita3, Takehiro Tamaoka1, Mitsunari Auchi3, Taisuke Sasaki4, Yasukazu Murakami3
1Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan
2Graduate School of Information Science and Technology, Osaka University, Osaka 565-0871, Japan
3The Ultramicroscopy Research center, Kyushu University, Fukuoka, 819-0395, Japan
4National Institute for Materials Science, Tsukuba 305-0047, Japan

Tóm tắt

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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