How to register and average images together from a mat file

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I was given a mat file that contains a collection of shifted frames. I need to figure out how to register the shifted frames and average them together. I am pretty unfamiliar with this side of matlab so I don't really know where to begin, any help would be appreciated.
I have attached the mat file and the jpeg.

Answers (1)

Kevin Holly
Kevin Holly on 29 Nov 2021
  7 Comments
Cameron Kreevich
Cameron Kreevich on 29 Nov 2021
Edited: Cameron Kreevich on 29 Nov 2021
Yes i am assuming the 1st frame is fixed, with the above code the first figure displayed is the 20 framees and the one underneath is the frames averaged together correct?
yanqi liu
yanqi liu on 30 Nov 2021
yes,sir,may be use moving matrix,such as
clc
clear
close all
load( 'undergraduate_data.mat' ); % 125-by-125-by-30
[optimizer, metric] = imregconfig('monomodal');
% Assuming first image is fixed
new = photoshift;
figure
for index = 2:1:size(photoshift, 3)
subplot(2,1,1)
imagesc(photoshift(:, :, index)); grid on; daspect( [1 1 1] );drawnow
% use now photoshift and last new
new(:,:,index) = imregister(photoshift(:, :, index),new(:,:,index-1),"affine",optimizer, metric);
subplot(2,1,2)
imagesc(new(:, :, index)); grid on; daspect( [1 1 1] );drawnow
pause(0.1)
end
average_new = mean(new,3);
figure; imshow(average_new,[]);

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