Problem $4.$ Linea$($r$)/($N$)$on$-$linear filtering,

Consider the comic.png image. Convert it to Grayscale using library function. Compute

the following nonlinear filtering by considering windows with

variable stride lengths: $1$min$2\backslash$sigma $,$ Choose $\backslash$sigma in$\{10,20,30\}$

cp$\%$ of the pixels se$-$

lected randomly are set to $0$ or $255$ with equal probability. Choose pin$\{10,20,30\}$

Show the difference images between the true image and the denoised image, and report

the corresponding mean$-$squared errors.