| http://www.w3.org/ns/prov#value | - More specifically, for a point (x,y) in the (aerial) image plane 22 (note that this is different from the pupil plane point (xp,yp)), the gradient (G) of the aerial image intensity (I), which gradient is a vector, can be computed as:G??????(x,y)=(???I???x,???I???y) where I(.) represents the aerial image intensity.Then???G??????(x,y)???=(???I???x)2+(???I???y)2 represents the magnitude of the gradie
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