source code for fingerprint alignment

2012 9 21
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Hi
I'm doing research on fingerprint identification. I need to align two fingerprints before doing the rest of matching processes. So now I'm in need of fingerprint alignment Matlab code.
My code is based on cross correlation. I cropped a small region of one image and try different rotation to get the maximum correlation between these two images. There are two main problems with my code:
1- trying different angles is very time consuming, empirically, I have to test different degrees from -90 to 90.
2- there is no reason to be sure the region I'm cropping is also available in the other image (there are some partial fingerprints in my data set).
here is the main part of my code.
T = -10;
for ang = -90: 1 : 90
IT = imrotate(im1,ang, 'crop');
cor = normxcorr2(im2,IT);
[Max, ~] = max(abs(cor(:)));
if Max > T
max_c = Max;
T = max_c;
Tang = ang;
end
end
Thanks

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Image Analyst
Image Analyst 2012-9-22

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Why don't you try imregister()?

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Omid
Omid 2012-9-23
编辑：Omid 2012-9-23
Thanks, Image Analyst. can you please tell me by using imregister as
movingRegistered = imregister(moving,fixed,'similarity',optimizer,metric);
where I can find the rotation angle and scaling degree between two images. and also, the degree of similarity between two images after registration. Thanks
Image Analyst
Image Analyst 2012-9-23
It's somewhat new and I haven't had the need to try it yet. There is an example in the help where they identify the rotation angle and fix it. Did you overlook that example?
Omid
Omid 2012-9-25
No, I couldn't find any example talking about the rotation angle.
Image Analyst
Image Analyst 2012-9-25
Then look here for the examples: http://www.mathworks.com/help/images/ref/imregister.html They're in the third section, in bold type, called "Examples":
Examples
  1. Register 2–D Images from Same Capture Device
  2. Registering Multimodal MRI Images
Omid
Omid 2012-9-26
I've seen these examples, but what I meant was, these examples don't say anything about the rotation angle and scale degree and ...

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