MATLAB: Measure the displacement of an object between two figures or more.

image processing

Dear all,
I am completely new in image processing and I do not know how to start. I have a set of pictures where only one object has different positions, the rest of the things in the pictures are static. I want to keep the object position of the first picture as a reference and measure how much that object has moved in the other pictures.
I think there must already be a straightforward example, but I could not find it.
Regards.

Best Answer

reference resources
clear all; clc; close all;
rects = [];
for i = [2 6 12]
    img = imread(sprintf('./G%d.JPG', i));
    img = imresize(img, 600/size(img,1), 'bilinear');
    J = rgb2lab(img);
    a = mat2gray(J(:,:,1));
    b = im2bw(a, 0.7);
    b = imclose(b, strel('disk', 20));
    b = imfill(b, 'holes');
    b = imclearborder(b);
    b = bwareafilt(b,1);
    [r, c] = find(b);
    rect = [min(c) min(r) max(c)-min(c) max(r)-min(r)];
    rects = [rects; rect];
    figure(1); cla;
    imshow(img, []);
    hold on; rectangle('Position', rect, 'EdgeColor', 'm', 'LineWidth', 2);
    plot(rects(:,1)+rects(:,3)/2, rects(:,2)+rects(:,4)/2, 'w--', 'LineWidth', 4);
    pause(1e-3);
    dis = norm([rects(end,1)+rects(end,3)/2 rects(end,2)+rects(end,4)/2]-[rects(1,1)+rects(1,3)/2 rects(1,2)+rects(1,4)/2]);
    title(sprintf('moved %.2f', dis));
end
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