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Optical Engineering • Open Access

Phase extraction and unwrapping using rotational and direct compensators for digital hologram
Author(s): Samia Heshmat; Satoshi Tomioka; Shusuke Nishiyama

Paper Abstract

The growing interest in the applications of digital holography interferometry has led to an increasing demand for reliable phase unwrapping techniques. In digital holography, the phase carries three-dimensional surface information about the object. However, phase mapping is ambiguous as the extracted phase is returned in a form that suffers from phase jumps. Furthermore, the presence of noise in the measured data, in which many singular points (SP) are found, often makes general phase unwrapping algorithms fail to produce accurate unwrapped results. Therefore, it is necessary to use a powerful phase unwrapping method to recover the desired smooth phase surface. For this reason, we developed a phase unwrapping algorithm that is applicable to digital hologram maps. The developed algorithm solves the singularity problem caused by SPs as a result of compensating its effect by using rotational and direct compensators. We show a difference in performance between our developed phase unwrapping algorithm and other well known phase unwrapping methods for digital holographic data. In addition, the methods to extract phase information of the object from hologram maps are also investigated. Results show that the developed algorithm gives satisfactory unwrapped results with low computational time cost.

Paper Details

Date Published: 7 June 2013
PDF: 9 pages
Opt. Eng. 52(10) 101910 doi: 10.1117/1.OE.52.10.101910
Published in: Optical Engineering Volume 52, Issue 10
Show Author Affiliations
Samia Heshmat, Hokkaido Univ. (Japan)
Satoshi Tomioka, Hokkaido Univ. (Japan)
Shusuke Nishiyama, Hokkaido Univ. (Japan)

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