3D and snapshot hyperspectral cameras based on continuously variable filters

Hyperspectral imaging (HSI) has been used for a couple of decades in applications such as satellite imaging, air reconnaissance and other not overly price sensitive markets. Still, there is no clear definition of the term hyperspectral imaging. Sometimes techniques that produce 2D images with more than the typical three RGB colours (or spectral channels) - for example by inclusion of a near-infrared channel - are already called hyperspectral. Mostly though, this is not considered sufficient. Typically, even ten spectral channels are still to be called multi-spectral rather than hyperspectral.