pproriately. 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="%pathto:vl_sift;">VL_SIFT</a>() and VLFeat C API documentation).
</p><dl><dt>
Example
</dt><dd><p>
This example produces equivalent SIFT descriptors using
<a href="%pathto:vl_dsift;">VL_DSIFT</a>() and <a href="%pathto:vl_sift;">VL_SIFT</a>():
</p><pre>
 binSize = 8 ;
 magnif = 3 ;
 Is = vl_imsmooth(I, sqrt((binSize/magnif)^2 - .25)) ;

 [f, d] = vl_dsift(Is, 'size', binS