| http://www.w3.org/ns/prov#value | - een), 600 nm (red) and 680 nm (far red) respectively, the apparatus including an image processor for processing the image or images captured by the camera, wherein the image processor is operable to perform a linear mathematical combination of logarithms of the four components, with weighting, in order to eliminate contributions from non-uniform distributions of melanin, rod photo pigments and con
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