code: public boolean isDescriptionComplete( KltFeature feature ) {
  		for( int i = 0; i < lengthFeature; i++ ) {
  			if( Float.isNaN(feature.desc.data[i]) )
  				return false;
  		}
  		return true;
  	}
docs: Checks to see if the feature description is complete or if it was created by a feature partially
  outside the image