| http://www.w3.org/ns/prov#value | - s substantially at 460 nm (blue), 530 nm (green), 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 the logarithms of the four components of the image or images, each component corresponding to one of said peaks,
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