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DOE OSTI · 1853780

Two-phase accurate multiplexed structured image capture (2pAc-MUSIC)

McCord, Walker·He, Zichen·Williamson, Nathan·Smith, Cary Dean·Gragston, Mark T.·Zhang, Zhili
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Abstract

Multiplexed Structural Image Capture (MUSIC) technique uses modulation of light from a scene prior to imaging to encode the temporal evolution of target into spatial frequency shifts, with each shift corresponding to a unique time and resulting in individual distinct snapshots. Computational-processing of the multiplexed single-shot image can recover the nanosecond-resolution scene evolution. One of the limitations is the loss of spatial resolution of the recovered image due to limitations of the low-pass spatial frequency filtering depth. Here we demonstrated that two images with complementary spatial phases can be used to enhance the spatial resolutions. For this application, 2 Phase Accurate (2pAc)-MUSIC is implemented that a scene is encoded with two complementary phases. The increased spatial information captured reduces the lower frequency noise in the Fourier domain found in single-phase MUSIC. A recovery algorithm combines the 180-degree spatial frequency shifted images into a single scene and applies a spatial filter in the Fourier domain that has a larger depth than previously possible to achieve a scene with increased spatial resolution. The 2pAc-MUSIC can effectively enhance the spatial resolution by removing the overlapping zero-order spatial frequencies.

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71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICSCombustion diagnosticsComputational imagingOptics

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McCord, Walker, He, Zichen, Williamson, Nathan, Smith, Cary Dean, Gragston, Mark T., Zhang, Zhili. 2021-03-24. Two-phase accurate multiplexed structured image capture (2pAc-MUSIC). https://doi.org/10.1016/j.optlaseng.2021.106621

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