FT</a>() does not use MAGNIF because, by using dense
sampling, it avoids detecting keypoints in the first plance.
</p><p>
<a href="VL_DSIFT.html">VL_DSIFT</a>() does not smooth the image as SIFT does. Therefore, in
order to obtain equivalent results, the image should be
pre-smoothed approriately. Recall that in SIFT, for a keypoint of
scale S, the image is pre-smoothed by a Gaussian of variance S.^2
- 1/4 (see <a href="VL_SIFT.html">VL_SIFT</a>() and VLFeat C API documentation).
</p><dl><dt>
Exampl