 magnification factor, and denoted
MAGNIF. Therefore, the keypoint scale corresponding to the
descriptors extracted by <a href="%pathto:vl_dsift;">VL_DSIFT</a>() is equal to SIZE /
MAGNIF. <a href="%pathto:vl_dsift;">VL_DSIFT</a>() does not use MAGNIF because, by using dense
sampling, it avoids detecting keypoints in the first plance.
</p><p>
<a href="%pathto:vl_dsift;">VL_DSIFT</a>() does not smooth the image as SIFT does. Therefore, in
order to obtain equivalent results, the image should be
pre-smoothed a