Realization of tunable edge-enhanced images based on computing metasurfaces

Bright-field imaging and edge imaging can extract different characteristics from objects, and therefore play important roles in image processing and pattern recognition. Here, we propose a fast, convenient, and electrically driven adjustable scheme to achieve tunable edge-enhanced images based on co...

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Bibliographic Details
Published in:Optics letters 2022-02, Vol.47 (4), p.925-928
Main Authors: Xiao, Titao, Yang, Hua, Yang, Qiang, Xu, Dingyu, Wang, Ruisi, Chen, Shizhen, Luo, Hailu
Format: Article
Language:English
Subjects:
Computation
Image enhancement
Image processing
Metasurfaces
Object recognition
Pattern recognition
Phase plates
Polarization
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Summary:Bright-field imaging and edge imaging can extract different characteristics from objects, and therefore play important roles in image processing and pattern recognition. Here, we propose a fast, convenient, and electrically driven adjustable scheme to achieve tunable edge-enhanced images based on computing metasurfaces. The computing metasurface can perform spatial differential operation as optical waves propagate through it. This optical differential operation is polarization-dependent, thus any desirable contrast can be realized by the interplay between two orthogonal polarization components. By regulating the external voltages applied on the liquid-crystal phase plate, different phase retardances between two orthogonal polarization components are introduced; this allows us to quickly switch between the bright-field image and the edge image.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.450988