A method and apparatus of obtaining a spectral image of a plurality of predetermined chemical species. A sample is illuminated to produce photons. These photons are collected to produce a plurality of images for each predetermined chemical species, wherein each image comprises a frame consisting of a...http://www.google.ca/patents/US7956991?utm_source=gb-gplus-sharePatent US7956991 - Method and apparatus for interactive hyperspectral image subtraction
