a$.$ Smooth the image with a Gaussian filter. $($as in part $1)$

b$.$ Compute gradient magnitude and direction.

c$.$ Perform non$-$maximum suppression to thin edges, given the following direction matrix:

$3$x$3$ Gaussian Filter

$\frac{1}{16}**$

$\backslash$table$[[1,2,1],[2,4,2],[1,2,1]]$

$\backslash$table$[[0,135,180,225],[90,0,135,180],[45,90,0,135],[0,45,90,180]]$

$*$Each angle represents the direction of edges relative to the pixel.

d$.$ Apply double thresholding to identify potential edges using $40$ and $85.($Use edge tracking by hysteresis to finalize the detected edges$).$