Image origin X Filter mask g(x,y)=w(-1,-1)f(x-1,y-1) +w(-1,0)f(x-1,y)+ =∑(.f(ex+sy+) fx-1,y-1)fx-1,y) f(x-l,y+1) w(-1,-1) w(-1,0) w(-1,1) g(x.y)= f(x,y-1) f(x,y) f(x.y+1) ● w(0,-1) 1w(0,0) w(0,1) dot product f(x+Ly-l)f(x+ly) f(x+1,y+I) w(1,-1) w(L,0) w(L,1) Pixels of image section under filter Filter coefficientsFilter mask w( 1, 1) − − w( 1,0) − w( 1,1) − w(0, 1) − w(0,0) w(0,1) w(1, 1) − w(1,0) w(1,1) Filter coefficients f (x 1, y 1) − − f (x 1, y) − f (x 1, y 1) − + f (x, y 1) − f (x, y) f (x 1, y 1) + − f (x 1, y) + f (x, y 1) + f (x 1, y 1) + + Pixels of image section under filter x y Image origin ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1 1 1 1 , 1, 1 1, 1 1,0 1, ... , , s t g x y w f x y w f x y w s t f x s y t =− =− = − − − − + − − + = + +   ● dot product g(x,y) =