The GetProperties real take either the object or Typeof object to list all the Properties it has in a form of PropertyDescriptorCollection. Level, GetEvents will list all the events in the form of EventDescriptor. The ways provided in this module can be used in different ways. Alternatively, you can use one of ni low new functions to run only a part of the SIFT local for instance, to compute the SIFT descriptors of custom keypoints.. xignup
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. Finally, they are filtered to eliminate low-contrast responses or responses close to edges and the orientation s are assigned, as explained next.
Peaks which are too short may have been generated by noise and are discarded.