code: public static <I extends ImageGray<I>, D extends ImageGray<D>>
  	GeneralFeatureIntensity<I,D> hessian(HessianBlobIntensity.Type type, Class<D> derivType) {
  		return new WrapperHessianBlobIntensity<>(type, derivType);
  	}
docs: Blob detector which uses the image's second order derivatives directly.
  
  @see HessianBlobIntensity
  
  @param type Type of Hessian
  @param <I> Input image type.
  @param <D> Derivative type.
  @return Hessian based blob intensity