function j = blur(filename, sigma)%      Blur is a function that given an image as input, it will blur %      a copy of it using a gaussian function with parameters%      determined by the user - radius and sigma.%      %      BLUR('filename.xxx', radius, sigma);% if sigma < 1, radius = [2 2];else radius = [2*sigma 2*sigma];endfname = imread(filename);temp = fspecial('gaussian', radius, sigma);j = imfilter(imresize(fname, 0.35), temp, 'same', 'conv');