docs: public static <D extends ImageGray<D>>
  	OrientationHistogramSift<D> sift(ConfigSiftOrientation config , Class<D> derivType ) {
  		if( config == null )
  			config = new ConfigSiftOrientation();
  		config.checkValidity();
  
  		return new OrientationHistogramSift(config.histogramSize,config.sigmaEnlarge,derivType);
  	}