| 定量相衬成像中自适应阈值翻转的相位解包裹算法 |
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| 引用本文： | 林盼明,罗都,李军,黄佐华. 定量相衬成像中自适应阈值翻转的相位解包裹算法[J]. 华南师范大学学报(自然科学版), 2020, 52(5): 19-25. DOI: 10.6054/j.jscnun.2020073 |
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| 作者姓名： | 林盼明 罗都 李军 黄佐华 |
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| 作者单位： | 华南师范大学物理与电信工程学院，广州 510006 |
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| 基金项目： | 华南师范大学学生课外科研一般课题;国家自然科学基金;广州市科学研究专项 |
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| 摘 要： | 当原始相位超过周期π时,定量相衬成像中多峰相位分布与包裹相位会出现增减交替,存在多极值点.针对该问题,提出一种基于自适应阈值翻转的相位解包裹算法(SATR),实现了定量相衬成像中的真实相位重构,分析了相衬成像原理和自适应阈值翻转相位解包裹算法的实现过程.通过模拟验证计算,并与最小二乘法(LS)、横向剪切最小二乘法(LSBLS)以及四向横向剪切最小二乘法(FLSBLS)的结果进行对比,证明该算法的可行性与准确性.该算法在一定程度上提高了相位解包裹的精确度,为强干扰、高精度及大计算量的解包裹提供了新的思路.
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| 关 键 词： | 自适应阈值 相位翻转 相位解包裹 定量相衬成像 微透镜 |
| 收稿时间： | 2020-01-21 |
Self-Adaptive Threshold Reversal Algorithm for Phase Unwrapping in Quantitative Phase Contrast Imaging |
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| Affiliation: | School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China |
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| Abstract: | To solve the problems in quantitative phase contrast imaging such as the alternate increase and decrease between multi-peak phase distribution and wrapping phase distribution and the existence of multiple extremum points of the wrapping phase when the original phase exceeds the period π, a phase-unwrapping algorithm based on self-adaptive threshold reversal (SATR) is proposed. The algorithm realizes real phase reconstruction in quantitative phase contrast imaging. The realization of the principle of phase contrast imaging and the self-adaptive threshold reversal algorithm is analyzed, and the feasibility and accuracy of the method are proved through simulation verification calculation and comparison with Least-Square phase unwrapping algorithm (LS), Least-Square algorithm based on Lateral sheering interferometry (LSBLS) and Four-Direction Least-Square phase unwrapping algorithm based on Lateral shearing interferometry (FLSBLS). The algorithm improves the precision of phase unwrapping to some extent and provides a new idea for phase unwrapping under strong interference, demand for high precision and a large amount of calculation. |
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