1) Compare the time complexity of convolution with a n x n kernel when using:
(a) direct convolution with the 2-D mask, and
(b) a separable kernel.
2) Prove the following properties of the Gaussian function,
(a) Symmetry: G(x) =G(-x)
(b) Product of two Gaussians is a Gaussian: G1(x) xG2(x)= G(x)