Abstract
Performing imaging with scattered light is challenging due to the complex and random modulation imposed upon the light by the scatterer. Persistent correlations, such as the optical memory effect (ME), enable high-fidelity, diffraction-limited imaging through scattering media without any prior knowledge of or access to the scattering media. However, conventional ME techniques have been limited to gray-scale imaging. We overcome this restriction by using spectral coding and compressed sensing to realize snapshot color imaging through scattering media. We demonstrate our method and obtain high-fidelity multispectral images using both emulated data (spanning the visible and infrared) and experimental data (in the visible).
Highlights
For the objects with widely-separated spectra, the light passes through a set of multi-bandpass spectral filters (Semrock AVOR-0012, NF03-658E-25,FF01-430/LP-25, FF01-745/SP25,NF03-561E-25), which results in three spectral channels centered at 450, 550 and 650 nm with bandwidths of 11, 8.8 and 5.7 nm full width at half maximum (FWHM), respectively
We place a machine vision lens (Computar TEC-55) 12 cm away from and focused on the second spatial light modulators (SLMs) in order to better fit the object within the ME field of view
It is important to stress that the long exposure times used in most of the experiments arise because of the severe photon loss introduced by the optical components that were inserted in the system to create a controllable source object to facilitate quantitative performance comparison of our proposed method and that these components will not be present in any real-world application
Summary
The light passes through an integrating sphere so that it is sufficiently spatially incoherent and static While this approach sacrifices a significant amount of optical power, it has the advantage that we can create a broad range of interesting objects with complete knowledge about their spectral and spatial characteristics. For the objects with widely-separated spectra, the light passes through a set of multi-bandpass spectral filters (Semrock AVOR-0012, NF03-658E-25,FF01-430/LP-25, FF01-745/SP25,NF03-561E-25), which results in three spectral channels centered at 450, 550 and 650 nm with bandwidths of 11, 8.8 and 5.7 nm full width at half maximum (FWHM), respectively. We define the color object (i.e., impose a specific weighting of each spectral component at each location) by passing the filtered light through a pair of spatial light modulators (SLMs): the first SLM (Holoeye LC2012) is placed between a pair of crossed polarizers and generates a high-contrast, spectrally-uniform object shape, whereas the second SLM (Pluto) imposes a spatiospectrally varying modulation by virtue of its voltage-controlled wavelength-dependence. We place a machine vision lens (Computar TEC-55) 12 cm away from and focused on the second SLM in order to better fit the object within the ME field of view
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