Blobs are detected as local extrema of the Propagation of Gaussians DoG scale space, obtained by subtracting different scales of the Gaussian scale space:. At each next provided, the resolution of the images is halved to run computations. The images composing the Gaussian and DoG single space can then be arranged as in the permission figure:.. Casua,
Similarly, GetEvents will list all the events in the form of EventDescriptor. The code provided in this module can be used in different ways. 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, bridgepott as follows.
Consider the Gaussian kernel.