| http://www.w3.org/ns/prov#value | - C ( x , y ) = - K R ( x , y ) - M ( x , y ) M ( x , y ) [ 1 ] where R(x,y) is the grey scale intensity of the thickness image of the raw image R at pixel (x,y), M(x,y) is the average grey scale intensity calculated in the surrounding area of the pixel (x,y) on the raw image R, and K is a constant.
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