how to get the compressed image from huffman

i am using huffman dictioanry to encode n decode

how do i get the compressed image entropy, average length

this is my code

clc
clear all
inputImage=imread('cameraman.bmp');
[row col] =size(inputImage);

quantizedValue=10;
QuantizedImage= inputImage/quantizedValue;
QuantizedImage=round(QuantizedImage);
%QuantizedImage=uint8(QuantizedImage);
%ImageArray=reshape(QuantizedImage,[1 row*col]);

GrayValueDict=(1:256);
ProbDict=zeros(1,256);
%{
for(i=0:255)
   GrayValueDict(i+1)=i; 
end

    %}   

for(i=0:255)

      for(r=1:row)

          for(c=1:col)

              if(i==QuantizedImage(r,c))
                 ProbDict(i)=ProbDict(i)+1;
              end
          end
      end
  end

ProbDict= ProbDict/(row*col)   ;
%ProbDict= round(ProbDict,3);
dict = huffmandict(GrayValueDict,ProbDict,5);

sig=reshape(QuantizedImage,[1 row*col]);
hcode = huffmanenco(sig,dict);
dhsig = huffmandeco(hcode,dict);
out= reshape(dhsig, [256 256]);
out=out*10;
subplot(1,2,1);
imshow(inputImage,[]);
subplot(1,2,2);
imshow(out,[]);
isequal(sig,dhsig);