3x3 Average filter in matlab

Question

I\'ve written code to smooth an image using a 3x3 averaging filter, however the output is strange, it is almost all black. Here\'s my code.

function [filtere         


        

Answer 1

img = imread('img.bmp');
filtered = imfilter(double(img), ones(3) / 9, 'replicate');
imshow(uint8(filtered));