• Photonics Research
  • Vol. 9, Issue 10, 1958 (2021)
Xi Yang1、*, Pavan Chandra Konda1, Shiqi Xu1, Liheng Bian2, and Roarke Horstmeyer1、3、4
Author Affiliations
  • 1Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, USA
  • 2School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
  • 3Department of Physics, Duke University, Durham, North Carolina 27708, USA
  • 4Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA
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    DOI: 10.1364/PRJ.427699 Cite this Article Set citation alerts
    Xi Yang, Pavan Chandra Konda, Shiqi Xu, Liheng Bian, Roarke Horstmeyer. Quantized Fourier ptychography with binary images from SPAD cameras[J]. Photonics Research, 2021, 9(10): 1958 Copy Citation Text show less

    Abstract

    Recently developed single-photon avalanche diode (SPAD) array cameras provide single-photon sensitivity and picosecond-scale time gating for time-of-flight measurements, with applications in LIDAR and fluorescence lifetime imaging. As compared to standard image sensors, SPAD arrays typically return binary intensity measurements with photon time-of-arrival information from fewer pixels. Here, we study the feasibility of implementing Fourier ptychography (FP), a synthetic aperture imaging technique, with SPAD array cameras to reconstruct an image with higher resolution and larger dynamic range from acquired binary intensity measurements. Toward achieving this goal, we present (1) an improved FP reconstruction algorithm that accounts for discretization and limited bit depth of the detected light intensity by image sensors, and (2) an illumination angle-dependent source brightness adaptation strategy, which is sample-specific. Together, these provide a high-quality amplitude and phase object reconstruction, not only from binary SPAD array intensity measurements, but also from alternative low-dynamic-range images, as demonstrated by our simulations and proof-of-concept experiments.
    zn(r)=|F1{F[s(r).eiϕ(r,θn)]·P(k)}|2,

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    zn(r)=|F1[O(kkn)·P(k)]|2,

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    yn(r)=QM[β·zn(r)Δtn].

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    QM(x)={x·2Mifx<12M1ifx1,

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    yn(r)=QM[αn·zn(r)].

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    ψ(r)=y^n(r)exp[iψ(r)].

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    E={0y^n(r)=yn(r)1y^n(r)yn(r).

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    ψ(r)=[y^n(r)αnE+|ψ(r)|(1E)]exp[iψ(r)].

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    Ot,n(kkn)=Ot1,n(kkn)δ[P(k)]F[ψ(r)ψ(r)]|P(k)|max[|P(k)|2+ξ],

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    NMSE=r|S(r)γR(r)|2r|R(r)|2,  γ=rS(r)R(r)r|R(r)|2.

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    Xi Yang, Pavan Chandra Konda, Shiqi Xu, Liheng Bian, Roarke Horstmeyer. Quantized Fourier ptychography with binary images from SPAD cameras[J]. Photonics Research, 2021, 9(10): 1958
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