Patent ID: 8189887

Claim:
An imaging apparatus, comprising (a) a digital camera for capturing images of a subject expressed as a plurality of pixels having associated intensities; (b) a computer for programmatically processing digital images from said camera; (c) an imaging standard, said computer quantitatively comparing intensities of pixels of digital images of said standard in a first image to a subsequent digital image of said standard; (d) a light source for illuminating the subject, said computer controlling said light source and said camera for capturing images, said computer automatically identifying said standard in a digital image thereof, said light source including a source of a plurality of different types of light and said standard having a plurality of areas thereon having a different response to illumination by said different types of light, said standard including a fluorescence standard with a first fluorescent layer and a second attenuating layer, said second layer stacked on said first layer, wherein said fluorescence standard has a plurality of sub-areas having a different fluorescent response, at least one of which has a fluorescent response approximating that of human skin and wherein said second layer does not entirely cover said first layer, such that said fluorescence standard has two fluorescent responses, a first attributable to said first layer alone and a second attributable to said first layer as attenuated by said second layer.