docs: public static void checkShape(ImageGray original , ImageGray transformed )
  	{
  		if( transformed.width % 2 == 1 || transformed.height % 2 == 1 )
  			throw new IllegalArgumentException("Image containing the wavelet transform must have an even width and height.");
  
  		int w = original.width + original.width%2;
  		int h = original.height + original.height%2;
  
  		if( transformed.width < w || transformed.height < h)
  			throw new IllegalArgumentException("Transformed image must be larger than the original image. " +
  					"("+w+","+h+") vs ("+transformed.width+","+transformed.height+")");
  	}