Given a 4 ×4 image, find the 4 ×4 highpass filtered output using the 3 ×3 Laplacian filter with

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Step 1: Extend the borders symmetrically
We need to extend the borders of the image to apply the

Given a $4 \times 4$ image, find the $4 \times 4$ highpass filtered output using the $3 \times 3$ Laplacian filter with the borders symmetrically extended. $$ x(m, n)=\left[\begin{array}{llll} 64 & 62 & 62 & 68 \\ 68 & 66 & 58 & 64 \\ 75 & 70 & 60 & 58 \\ 72 & 69 & 59 & 60 \end{array}\right] $$