Patent ID: 9654745
Date: 2017-05-16
CPC Classifications: A61B,G01J,G01N,H04N

Claim:
1. An apparatus for multispectral imaging of an object, the apparatus comprising: a light source configurable to emit light having a first spectrum characterized by a first set of a plurality of narrow bands, wherein the plurality of narrow bands in the first set are emitted simultaneously, the apparatus arranged to direct the light from the light source onto an area of the object; and, a multi-channel imaging light detector arranged to image the area of the object by obtaining reflectance imaging signals while exposing the object to the light having the first spectrum and configured to provide multi-channel image data based on the reflectance imaging signals; and an image processing system configured to extract a plurality of spectral images from the multi-channel image data, the plurality of spectral images comprising a spectral image corresponding to each of the plurality of narrow bands, wherein the image processing system comprises an intensity calibration algorithm operable to process the plurality of spectral images to yield one or more of corrected albedo spectral images and corrected absorption and corrected scattering spectral images, the intensity calibration algorithm being configured to correct an intensity of the plurality of spectral images to account for measurement geometry variations using a measurement geometry constant Ka and an albedo correction constant Ks, wherein initial input values of the measurement geometry constant Ka and the albedo correction constant are randomly chosen and the intensity calibration algorithm proceeds iteratively until a calculated geometry constant Kac and a calculated albedo correction constant Ksc converge, the calculated geometry constant Kac and the calculated albedo correction constant Ksc being applied for producing the at least one of the corrected albedo spectral images, or corrected absorption and corrected scattering spectral images.