Transformation of color representations and spectral recovery

A computer-implemented method comprising:

• receiving a set of spectral datapoints obtained from a plurality of images of natural scenes, wherein the images are captured using a hyperspectral imaging device;
• performing data sampling to obtain a subset of said set of spectral datapoints that is representative of naturally-occurring spectral samples;
• projecting said subset of datapoints over (i) a known spectral response profile of a source color space, and (ii) a known spectral response profile of a target color space, to obtain corresponding datasets of source spectral reference atoms and target spectral reference atoms;
• and
• for each point in said source color space:
• (a) identifying the k nearest atoms in said dataset of source spectral reference atoms;
• and (b) calculating and storing a transform associated with said point from said k nearest atoms in said dataset of source spectral reference atoms to a set of corresponding k atoms in said dataset of target spectral reference atoms.

A computer program product comprising a non-transitory computer-readable storage medium having program instructions embodied therewith, the program instructions executable by at least one hardware processor to:

• receive a set of spectral datapoints obtained from a plurality of images of natural scenes, wherein the images are captured using a hyperspectral imaging device;
• perform data sampling to obtain a subset of said set of spectral datapoints that is representative of naturally-occurring spectral samples;
• project said subset of datapoints over (i) a known spectral response profile of a source color space, and (ii) a known spectral response profile of a target color space, to obtain corresponding datasets of source spectral reference atoms and target spectral reference atoms;
• and
• for each point in said source color space:
• (a) identify the k nearest atoms in said dataset of source spectral reference atoms;
• and (b) calculate and store a transform associated with said point from said k nearest atoms in said dataset of source spectral reference atoms to a set of corresponding k atoms in said dataset of target spectral reference atoms.