eatures</code>. For example, an instance of a class of VLFeat SIFT
feature extractor can be obtained by:</p>

<precode type="matlab">
sift = localFeatures.VlFeatSift() ;
</precode>

<p> The feature extractor object manages the values of feature extractor
parameters. Default values are set in the constructor of the object however
any parameter can be changed. For example we can create VLF-SIFT feature
extractor with different peak threshold parameter. </p>

<precode type="matlab">
thrSift = localFeatures.VlF