Which feature matcher will be the best for iris recognition

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Hi guys, I'm new in biometrics, but I must to write an application for iris recognition. I have already my iris image normalized to cartesian coordinates, and I want to have a database (or just a folder in my local disc) with iris codes.

Now, I'm just wondering which matcher should I choose. Which one is the best for detection a small differences in images?

I've already try to detect features with Gabor filter and then compare it with hamming dystanse, but my results wouldn't be satisfying.

Thanks for any help.