How to perform iris normalization?
Please check the following for Iris Normalization:


  Nithyanandam. S, Gayathri K.S., Priyadarshini P.L.K. - A New IRIS Normalization Process For The Recognition System With Cryptographic Techniques
  
  Arvacheh E. - A Study of Segmentation and Normalization for Iris
  Recognition
  Systems