appliquer une option dans une fonction matlab

**jeuneprincesse** · 24/05/2016, 15h20

Bonjour,
comment changer la valeur d'une option dans une fonction matlab ?
en effet, j'utilise le code d'andrea vedaldi http://www.vlfeat.org/matlab/vl_sift.html et j'aimerai utiliser les options de la fonction vl_sift

Code :

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VL_SIFT() accepts the following options:
 
Octaves maximum possible
Set the number of octave of the DoG scale space.
 
Levels 3
Set the number of levels per octave of the DoG scale space.
 
FirstOctave 0
Set the index of the first octave of the DoG scale space.
 
PeakThresh 0
Set the peak selection threshold.
 
EdgeThresh 10
Set the non-edge selection threshold.
 
NormThresh -inf
Set the minimum l2-norm of the descriptors before normalization. Descriptors below the threshold are set to zero.
 
Magnif 3
Set the descriptor magnification factor. The scale of the keypoint is multiplied by this factor to obtain the width (in pixels) of the spatial bins. For instance, if there are there are 4 spatial bins along each spatial direction, the ``side'' of the descriptor is approximatively 4 * MAGNIF.
 
WindowSize 2
Set the variance of the Gaussian window that determines the descriptor support. It is expressend in units of spatial bins.
 
Frames
If specified, set the frames to use (bypass the detector). If frames are not passed in order of increasing scale, they are re-orderded.
 
Orientations
If specified, compute the orientations of the frames overriding the orientation specified by the 'Frames' option.
 
Verbose
If specfified, be verbose (may be repeated to increase the verbosity level)

d'abord quelqu'un pourra m'expliquer laquelle de ces options qui s'intéresse au changement d'échelle de l'image ?
et comment l'appliquer ?
Merci infiniment d'avance pour toute réponse