huffman_dc_decoding.asv

%% this function is to do the Inverse huffman coding for dc part
%% the input should be the whole sequence including the output of DC,
%% the idea is to match the sequence with the code in
%% decode table, get the category of the value then cut the relative number, 
%% change them into decimal

function [dc_dehuff]=huffman_dc_decoding(blockbit_seq)
dc_dehuff=[];point=1;
len=length(blockbit_seq);
for i = point:len
    temp_dc = blockbit_seq(point:i);
    category_dc = detableDC(temp_dc);
    if category_dc >= 0 && category_dc <= 11;%get correct output, while doing the loop the category_dc
          category_dc;                                   %would be 12
        r_dc = blockbit_seq(i+1:i+category_dc);
%         if r_dc(1)=='0';   %% if it's a negative number
%             for j=1:length(r_dc)
%                  if r_dc(j)=='0';
%                      r_dc(j)='1';
%                     else r_dc(j)='0';
%                  end
%                 end
%                r_new=-bin2dec(r_dc);
%            else r_new=bin2dec(r_dc);
%         end  

        r_new = sym
        dc_dehuff=[dc_dehuff,r_new];
    
    point = i + category_dc+1;
    i = point;
    end
end   %finish DC part
%dc_dehuff