docs: public static <I extends ImageGray<I>, D extends ImageGray<D>>
  	KltTracker<I, D> klt(@Nullable KltConfig config, Class<I> imageType , Class<D> derivType )
  	{
  		if( config == null )
  			config = new KltConfig();
  		if( derivType == null )
  			derivType = GImageDerivativeOps.getDerivativeType(imageType);
  
  		InterpolateRectangle<I> interpInput = FactoryInterpolation.<I>bilinearRectangle(imageType);
  		InterpolateRectangle<D> interpDeriv = FactoryInterpolation.<D>bilinearRectangle(derivType);
  
  		return new KltTracker<>(interpInput, interpDeriv, config);
  	}