Describe what the following MATLAB code does. the original function name has been replaced by f name. Specify where relevant which expressions in the textbook have been implemented. 20 points function [g x, g y] f name (IM, sigma) % (comment taken out) % [gx.gyl f name(IM, sigma) (comment taken out) epsilon =1e-2; half size=ceil(sigma sqrt(2 pi) sigma epsilon))); size =2 halfsize+1; %(comment taken out) for I =1:size for j=1:size u=[i-halfsize-1j-halfsize -1];h x(I, j)= gauss(u(1)sigma d gauss(u(2),sigma); end h x = h x/sqrt(sum(abs(h x)abs(h x)))); %(comment taken out) g x=Im filter(IM, h x, replicate, con'); g y=I m filter ; function y= gauss(x, sigma) %(comment taken out) y =exp(-x^2(2 sigma sqrt (2 pi)); function y= d gauss(x, sigma) %(comment taken out) y= x gauss (x, sigma/sigma^ 2