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SIFT and OpponentSIFT normalisation

Hi all, When using SIFT or SURF descriptors, there output is normalized in a different way.

This can impact on the post-processing that is used afterwards. SURF seems to be L2 normalized. Regarding SIFT it is not the case.

Then, if using SIFT or Opponent SIFT, what normalization should be applied to converge to a L2 normalized version ? One can use a simple sift/(||sift||l2 +e) but regarding the current OpenCV SIFT implementation, is there a more convenient way to do ?