Image centroid in matlab

I have about 400 images I need to find its centroid in such a way that all other images have the same centroid in respect to the first image centroid (44.5 79.6). I was able to do it manually by calculating for each image as below.But it quite tedious doing it for 400 images. Please I need help/code that can execute the task.Thanks

Im1 = imread('image1.png');

[x,y] = ait_centroid(Im1);

Im01=uint16(Im1);

Im2 = imread('image2.png');

[x,y] = ait_centroid(Im2);

Im02=circshift(Im2, [-2 -4]); [x,y] = ait_centroid(Im02);

Im02=uint16(Im02);

Im3 = imread('image3.png'); [x,y] = ait_centroid(Im3); Im03=circshift(Im3, [-3 -5]); [x,y] = ait_centroid(Im03); Im03=uint16(Im03);

Answer 1

[Sean de Wolski]

You might want to read this:

FAQ4.6

and this:

FAQ4.12

[kiki]

Thanks for the links. I have come across them. I quite understand how looping works but question is based on how to write a program that can automatically center each image to say (44.5 79.5) by performing circshifts on each image (depending on their initial center) so that all matches the centroid of Im1.

[Sean de Wolski]

just subtract their centroid from im1's centroid to get your displacement vector. The translate with circshift or, if you have the IPT, my imtranslate:

http://www.mathworks.com/matlabcentral/fileexchange/27251-imtranslate