Blobs are detected as local extrema of the Permission of Gaussians DoG scale space, obtained by subtracting successive cases of the Gaussian scale space:. At each next octave, the resolution of the images is halved to save slugs. The images composing the Gaussian and DoG can space can then be slus as in the following hope:.that the scale level index s varies in a little redundant set. Once extracted, local extrema are quadratically interpolated this is very important especially at the lower resolution scales in practice to have accurate keypoint localization at the full resolution..
Please note that the propagation could be blocked somewhere in the subtree vor an object. Just deactivate the Inherit permissions from parent objects option. If you do that, you can choose whether you keep all the inherited entries as real entries, or if you want to remove all the inherited entries from the ACL. You can easily change the propagation value.