Generating narrow-band spectral images from broad-band spectral images

A spectral imager that comprises a tunable filter and an image sensor;

• wherein the sensor is configured to acquire a first plurality (N) of broad-band spectral images, each is acquired while the tunable filter is at a different state;
• and
• the imager further comprise a processor configured to
• process the first plurality of broad-band spectral images, the processing comprising:
• applying a reconstruction matrix that represents a cost function and spectral responses associated with different states of the tunable filter on the plurality of broad-band spectral images to thereby construct a second plurality (M) of narrow-band spectral images and improve spectral resolution of images provided by the imager.

A non-transitory computer readable storage medium tangibly embodying a program of instructions that, when executed by a computer, causing the computer to perform a method of generating narrow-band spectral images, the method comprising:

• acquiring, by a spectral imager that comprises a tunable filter, a first plurality (N) of broad-band spectral images, each is acquired while the tunable filter is at a different state;
• and
• processing, by a hardware processor, the first plurality of broad-band spectral images, the processing comprising:
• applying a reconstruction matrix that represents a cost function and spectral responses associated with different states of the tunable filter on the plurality of broad-band spectral images to thereby construct a second plurality (M) of narrow-band spectral images and improve spectral resolution of the spectral images.