An edge detection filter comprising an array of filter coefficients having {HEAD ~ an odd number} of rows and {TAIL ~ columns}, a first set of zero coefficients extending along a direction traversing the array through a center position to form a first and second side, a second set of positive coefficients extending away from the direction on the first side, and a third set of negative coefficients extending away from the direction on the second side 
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An edge detection filter comprising an array of filter coefficients having { HEAD ~ an odd number } of rows and { TAIL ~ columns } , a first set of zero coefficients extending along a direction traversing the array through a center position to form a first and second side , a second set of positive coefficients extending away from the direction on the first side , and a third set of negative coefficients extending away from the direction on the second side
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH