docs: public static <T extends ImageGray<T>, D extends ImageGray<D>>
  	GeneralFeatureDetector<T, D> createHessian(HessianBlobIntensity.Type type,
  											   @Nullable ConfigGeneralDetector configDetector, Class<D> derivType) {
  		if( configDetector == null)
  			configDetector = new ConfigGeneralDetector();
  
  		GeneralFeatureIntensity<T, D> intensity = FactoryIntensityPoint.hessian(type, derivType);
  		return createGeneral(intensity, configDetector);
  	}