  Multispectral imaging plays an important role in many applications from
astronomical imaging, earth observation to biomedical imaging. However, the
current technologies are complex with multiple alignment-sensitive components,
predetermined spatial and spectral parameters by manufactures. Here, we
demonstrate a single-shot multispectral imaging technique that gives
flexibility to end-users with a very simple optical setup, thank to spatial
correlation and spectral decorrelation of speckle patterns. These seemingly
random speckle patterns are point spreading functions (PSFs) generated by light
from point sources propagating through a strongly scattering medium. The
spatial correlation of PSFs allows image recovery with deconvolution
techniques, while the spectral decorrelation allows them to play the role of
tune-able spectral filters in the deconvolution process. Our demonstrations
utilizing optical physics of strongly scattering media and computational
imaging present the most cost-effective approach for multispectral imaging with
great advantages.
