1. [15 points] The gradient magnitudes and gradient angles have been computed for a 55 image as shown in the figures below. (a) Give the equation to compute edge pixel location with sub-pixel accuracy. (b) Apply your equation to compute the edge location with sub-pixel accuracy for the center pixel (and only the center pixel) located at (i,j)=(2,2). When applying your equation, use a total of five sample points or pixels (including the center pixel) in the weighted sum. You can round off your results to two digits after the decimal. Gradient magnitudes: M(x,y) Gradient angles: (x,y) in degrees