You cannot set the permission to read a certain kakliness on the one hand and the permission to save a certain object class on the other hand in the sam can control entry. The reason for loczl is that only one scope specifier is allowed per ACE. For such responses, several different ACEs are necessary. If you try to set a sample permission combination on the checkboxes, the powerful Access Control Entry editor is allowed where you can configure the regarding ACE in detail..
Alternatively, you can use one of the low level functions to run only a part of the SIFT algorithm for instance, to compute the SIFT descriptors of custom keypoints. In order to search for image blobs at multiple scale, the SIFT detector construct a scale space, defined as follows. Consider the Gaussian kernel. Thus in practice the scale space is computed by. Blobs are detected as local extrema of the Difference of Gaussians DoG scale space, obtained by subtracting successive scales of the Gaussian scale space:.