Edge enhancement of phase objects through complex media by using transmission-matrix-based spiral phase contrast imaging

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.

Graphical abstract

Keywords

complex media / edge detection / spiral phase contrast imaging

References

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2019YFA0705000), the National Natural Science Foundation of China (NSFC) (Nos. 12004219, 120742251, 2192254, 91750201, and 11974218), the Innovation Group of Jinan (No. 2018GXRC010), and the Local Science and Technology Development Project of the Central Government (No. YDZX20203700001766).

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