%Takes a cell-array list of files containing images,
%returns their average as an RGB array of doubles, range [0-1]
function avg_img = img_avg(file_names)
    img = imread(file_names{1});
    
    sum_img = zeros([size(img)]);

    
    for i = 1:length(file_names)
        sum_img = sum_img + double(imread(file_names{i}));
     
    end
    
    avg_img = mat2gray(sum_img/length(file_names));