title: Image processing for phase imperfections in electron holography.
abstract: In electron holography, an abrupt reversal of contrast from white to black may occur in a digitally reconstructed phase image, potentially resulting in inaccurate phase information. There are two types of such abrupt reversals. One is a phase jump of 2 π during the digital reconstruction process; in this case, the phase can be unwrapped and smoothly connected for such a jump. The other is caused by the disconnection of interference fringes due to weak electron-wave amplitude in some areas of the specimen. We propose a searching technique for finding the disconnection points based on mathematical morphology and then correcting the interference fringes. Finally, a comparatively accurate phase information image is reconstructed from the corrected interference fringes.
authors.affiliation: Graduate School of Engineering Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Jianhui
authors.initials: J
authors.lastname: Zhang
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Tanji
keywords: electron holography; interference fringes; phase information