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I am working on a vein pattern recognition project based on SURF algorithm and euclidean distance. I have completed my program to find the maximum and minimum distance between vein features and find a match exactly when there is an identical image. i.e max and min distance between two images is zero. In this case, how would I find my FAR and FRR. Will it be 0% or am I missing a big concept here?

Even if there is a slight variation it wouldn't match in which case, I guess I need to have a threshold value to compare to. I have calculate the max and min distance between all combination of images with the same hand, with different hands. In this case, how do I computer the FAR and FRR. This is my first biometrics project and it would be helpful if I am directed to any resource that would help me in this.

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