“Spectral imaging” (SI) refers to the acquisition of the three-dimensional (3D) spectral cube of spatial and spectral data of a sourceobject at a limited number of wavelengths in a given wavelength range. “Snapshot spectral imaging” (SSI) refers to the instantaneousacquisition (in a single “shot”) of the spectral cube, a process suitable for fast changing objects. Known SSI devices exhibit largetotal track length (TTL), weight and production costs and relatively low optical throughput. We present a simple SSI camera basedon a regular digital camera with (i) an added diffusing and dispersing “phase-only” static optical element at the entrance pupil("diffuser") and (ii) tailored compressed sensing (CS) methods for digital processing of the diffused and dispersed (DD) imagerecorded on the image sensor. The diffuser is designed to mix the spectral cube data spectrally and spatially and thus to enableconvergence in its reconstruction by CS-based algorithms. In addition to performing SSI, this SSI camera is capable to perform colorimaging using a "monochromatic" or "gray-scale" image sensor without color filter arrays.
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