CFZA camera: a high-resolution lensless imaging technique based on compound Fresnel zone aperture

In lensless imaging using a Fresnel zone aperture (FZA), it is generally believed that the resolution is limited by the outermost ring breadth of the FZA. The limitation has the potential to be broken according to the multi-order property of binary FZAs. In this Letter, we propose to use a high-orde...

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Bibliographic Details
Published in:Optics letters 2024-06, Vol.49 (12), p.3532
Main Authors: Tian, Zhanquan, Li, Lina, Ma, Jianshe, Cao, Liangcai, Su, Ping
Format: Article
Language:English
Subjects:
Algorithms
Apertures
Back propagation
Cameras
Fresnel zones
High resolution
Image reconstruction
Image resolution
Imaging techniques
Point spread functions
Transfer functions
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Summary:In lensless imaging using a Fresnel zone aperture (FZA), it is generally believed that the resolution is limited by the outermost ring breadth of the FZA. The limitation has the potential to be broken according to the multi-order property of binary FZAs. In this Letter, we propose to use a high-order component of the FZA as the point spread function (PSF) to develop a high-order transfer function backpropagation (HBP) algorithm to enhance the resolution. The proportion of high-order diffraction energy is low, leading to severe defocus noise in the reconstructed image. To address this issue, we propose a Compound FZA (CFZA), which merges two partial FZAs operating at different orders as the mask to strike a balance between the noise and resolution. Experimental results verify that the CFZA-based camera has a resolution that is double that of a traditional FZA-based camera with an identical outer ring breadth and can be reconstructed with high quality by a single HBP without calibration. Our method offers a cost-effective solution for achieving high-resolution imaging, expanding the potential applications of FZA-based lensless imaging in a variety of areas.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.527533