Phase unwrapping using deep learning in holographic tomography

被引:18
|
作者
Gontarz, Michal [1 ]
Dutta, Vibekananda [1 ]
Kujawinska, Malgorzata [1 ]
Krauze, Wojciech [1 ]
机构
[1] Warsaw Univ Technol, Inst Micromech & Photon, 8 Boboli St, PL-02525 Warsaw, Poland
基金
欧盟地平线“2020”;
关键词
IMAGE SEGMENTATION; ROBUST; NETWORK;
D O I
10.1364/OE.486984
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Holographic tomography (HT) is a measurement technique that generates phase images, often containing high noise levels and irregularities. Due to the nature of phase retrieval algorithms within the HT data processing, the phase has to be unwrapped before tomographic reconstruction. Conventional algorithms lack noise robustness, reliability, speed, and possible automation. In order to address these problems, this work proposes a convolutional neural network based pipeline consisting of two steps: denoising and unwrapping. Both steps are carried out under the umbrella of a U-Net architecture; however, unwrapping is aided by introducing Attention Gates (AG) and Residual Blocks (RB) to the architecture. Through the experiments, the proposed pipeline makes possible the phase unwrapping of highly irregular, noisy, and complex experimental phase images captured in HT. This work proposes phase unwrapping carried out by segmentation with a U-Net network, that is aided by a pre-processing denoising step. It also discusses the implementation of the AGs and RBs in an ablation study. What is more, this is the first deep learning based solution that is trained solely on real images acquired with HT.
引用
收藏
页码:18964 / 18992
页数:29
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