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Updated: Aug 10, 2025

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Spatial and axial resolution limits for mask-based lensless cameras.

Yi Hua, M Salman Asif, Aswin C Sankaranarayanan

    Optics Express
    |February 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a theoretical framework for lensless imaging resolution. It analyzes z-stacked measurements from a generalized mask-based camera to define spatial and axial resolving power.

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    Area of Science:

    • Optics and Photonics
    • Computational Imaging
    • 3D Reconstruction

    Background:

    • Lensless imaging systems face challenges in determining their 3D resolution capabilities.
    • Existing measurement models lack structures for in-depth analysis of spatio-axial resolution.

    Purpose of the Study:

    • To develop a theoretical framework for analyzing the spatio-axial resolution of lensless imaging systems.
    • To characterize the performance limits of generalized mask-based lensless cameras.

    Main Methods:

    • Analysis of a generalized mask-based lensless camera using z-stacked sensor measurements.
    • Mathematical modeling of the relationship between measurements and the scene's volumetric albedo via 3D convolution.
    • Fourier transform analysis of the convolutional operator.

    Main Results:

    • Established a theoretical framework to characterize spatial and axial resolution in lensless imaging.
    • Demonstrated that z-stacked measurements relate to scene albedo via a 3D convolutional operator.
    • Quantified the camera's resolving power, including its dependence on the attenuating mask.

    Conclusions:

    • The developed framework provides a theoretical upper bound for the performance of previously studied lensless systems.
    • The study offers a comprehensive understanding of resolution limits in generalized mask-based lensless cameras.
    • Numerical simulations validated the theoretical findings and their practical implications.