Iris Recognition - extract features and encoding

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Hey, I am working on Iris Recognition and I was searching for "flow - chart" or algorithms to do feature extraction and encoding after I got the normlized image.

After hours of searching( and reading many papers - including John Daugman's) I can find a proper and one way to do this.

Each paper has different way and each paper dont explaining how "to really do it".

So I want to ask if someone here worked on it and know maybe one true way of feature extraction and encoding Iris code from normalized image.

Thanks in advance.