Phase extraction and unwrapping using rotational and direct compensators for digital hologram
Phase extraction and unwrapping using rotational and direct compensators for digital hologram
复制标题
使用数字全息图的旋转和直接补偿器进行相位提取和展开
DOI：
10.1117/1.oe.52.10.101910
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发表时间：
2013
影响因子：
1.3
通讯作者：
Shusuke Nishiyama
中科院分区：
文献类型：
--
作者：
Samia Heshmat;Satoshi Tomioka;Shusuke Nishiyama
随着人们对数字全息干涉术应用的兴趣日益增长，对可靠的相位展开技术的需求也越来越大。在数字全息术中，相位携带关于物体的三维表面信息。然而，相位映射是不明确的，因为提取的相位以遭受相位跳跃的形式返回。此外，在测量数据中存在噪声，其中发现许多奇异点（SP），往往使一般的相位展开算法无法产生准确的展开结果。因此，有必要使用强大的相位展开方法来恢复所需的光滑相位表面。为此，我们开发了一种适用于数字全息图的相位展开算法。该算法采用旋转补偿器和直接补偿器对SPs的影响进行补偿，解决了SPs引起的奇异性问题。我们开发的相位展开算法和其他众所周知的数字全息数据的相位展开方法之间的性能差异。此外，还研究了从全息图中提取物体相位信息的方法。实验结果表明，该算法在较低的计算时间开销下获得了满意的解缠结果。
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 fromphase 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.