| http://www.w3.org/ns/prov#value | - The gradient functions are squared in order to assure that gradient values used to determine the COG's are of the same sign throughout the ROI. It would be within the scope of the invention to provide another method of assuring the same such as for example finding the absolute value of the gradient and the term "squaring the gradient values" used herein is defined to include said other methods.
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