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Edge enhancement of phase objects through complex media by using transmission-matrix-based spiral phase contrast imaging
Authors:Qian Zhao  Shijie Tu  Qiannan Lei  Qingyang Yue  Chengshan Guo  Yangjian Cai
Institution:1. Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China2. School of Physical Science and Technology, Soochow University, Suzhou 215006, China
Abstract:The wavefront shaping based technique has been introduced to detect the edges of amplitude objects through complex media, but the extraction of the boundary information of invisible phase objects through complex media has not been demonstrated yet. Here, we present a phase contrast imaging technique to overcome the scattering, aiming to achieve the edge detection of the phase object through the complex media. An operator based on the experimentally measured transmission matrix is obtained by numerically adding a spiral phase in the Fourier domain. With the inverse of the filtered transmission matrix, we can directly reconstruct the edge enhanced images for both amplitude object and phase object beyond scattering. Experimentally, both digital and real objects are imaged, and the results verify that isotropic edge detection can be achieved with our technique. Our work could benefit the detection of invisible phase objects through complex media.
Keywords:complex media  edge detection  spiral phase contrast imaging  
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