i've used the undecimated wavelet transform...i dont know how to extract low frequency and high frequency component out of it. the code is shown below.can anybody help me in doing so?

the code i wrote is ;

   grayImage=rgb2gray(imread('inputImage'));
   w1=ndwt2(grayImage,1,'haar');
   w1.filters;
   w1.dec;
   LL=w1.dec{1};  %low frequency component
   HH=w1.dec{4};  %high frequency component

the component i extracted at level 1(n=1) corresponding to LL and HH are correct or not???

plz tell me