calculating average

I have 60 images in a folder ,i want to take average of those images and subtract the averaged image with other images please help

clc;

clear all
close all;

pathname ='F:\images 
 dirlist = dir( [pathname '*.jpg'] );
 pickind='jpg';

for m2 = 1:length(dirlist)

        R =  imread([pathname, dirlist(m2).name]);

    ;
  ;
  ;
  ;

end

please tell how to process after reading that image

Answer 1

[Andrew Newell]

Here is some code that might do the job. I am assuming that your image is truecolor, so the data have dimensions M x N x 3 for some M and N, and the colors are 24-bit, so the data type in R is uint8. If your images are different, you'll have to adjust the code:

n = length(dirlist);
R =  imread([pathname, dirlist(1).name]);
RR = zeros([size(Rav) n]);

% Put the images into an M x N x 3 x 60 array
for m2 = 2:n
  RR(:,:,:,m2) = imread([pathname, dirlist(m2).name]);
end
Rav = mean(RR,4); % average along the 4th dimension of the data
RR = bsxfun(@minus,RR,Rav); % subtract the average from each image

You can examine the kth image with

R = RR(:,:,:,k);
image(R)