You can noise the list according to the different columns by clicking on them. There note that you can easily change the scope value according to the current scope type. Just click on the permission label directly in the regarding row and choose the new scope from the inherited list: Please be aware of the fact that there are combinations of checkboxes which are NOT possible or not discarded to set in one single ACL line..
Blobs are detected as local extrema of the Difference of Gaussians DoG scale space, obtained by subtracting successive scales of the Gaussian scale space:. At each next octave, the resolution of the images is halved to save computations. The images composing the Gaussian and DoG scale space can then be arranged as in the following figure:. Notice that the scale level index s varies in a slightly redundant set.
Once extracted, local extrema are quadratically interpolated this is very important especially at the lower resolution scales in order to have accurate keypoint localization at the full resolution.