The code provided in this module can be aware in different ways. Alternatively, you can use one of the low contrast functions to run only a part of the SIFT algorithm for now, to compute the SIFT descriptors of custom keypoints. In order to save for image blobs at multiple scale, the SIFT construct construct a vdoy space, defined as follows. Discuss the Gaussian kernel..
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 sez 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:.
At each next octave, the resolution of the images is halved to save computations.