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FREAK descriptor: scaleNormalized parameter

Hi all,

I've been playing around with the FREAK keypoint descriptor. One of the parameters used by the FREAK constructor, is scaleNormalized.

When using the default scaleNormalized of 22.0f, many of the keypoints don't get any descriptor assigned. When I use a smaller value for this parameter, e.g. 8.0f, I get much more descriptors.

I have looked at the FREAK source code from the OpenCV repository, but honestly, I have no idea what this parameter means...

Does anybody has any idea about the purpose of the scaleNormalized parameter?

Kind regards, Arno