How can i extract relevent information using Haar wavelet for iris recognition?

My idea is to extract features from normalised iris without using noise mask. For that, i calcluted approximation and vertical details at 4 level, and i reshape it to vector. After that, i effectuated comparaison (Matching) using Euclidean distance (data set used: Casia-Iris V3-Interval). I don't obtained good results as shown in attached file.Thank's in advance for your help.

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