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Hyperspectral imaging collects spatio-spectral information of objects useful in a wide range of applications including biomedical imaging. We propose a compact lensless snapshot HSI system, composed only of a monochromatic CMOS image sensor, a transparent phase-mask and a linear variable filter (LVF). The combination of a phase mask and an LVF generates wavelength-dependent transfer functions, and we can computationally recover the hyperspectral image stack from a single measurement. We report on the construction of the device, image reconstruction algorithm and spectral calibration methods and show the hyperspectral imaging performance of our prototype device the entire visible wavelengths.
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Taeyoung Kim, Myeong Hun Seong, Seung Ah Lee, "Snapshot hyperspectral imaging with a computational lensless camera," Proc. SPIE PC11951, Design and Quality for Biomedical Technologies XV, PC119510K (7 March 2022); https://doi.org/10.1117/12.2607699