retrieving image after encoding

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FIR 2012-12-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/57423-retrieving-image-after-encoding

my code is 
A=imread('imagcp.bmp');
A=A(:);
YourVector=double(A);
symbols = unique(YourVector(:));
counts = hist(YourVector(:), symbols);
p = double(counts) ./ sum(counts)
     [dict,avglen]=huffmandict(symbols,p);
     comp=huffmanenco(A,dict);
I want to dispaly image after encoding,plz help

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采纳的回答

Walter Roberson 2012-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/57423-retrieving-image-after-encoding#answer_69494

"comp" is not something that can be displayed. You need to do a huffman decoding of "comp" with "dict" in order to restore the image.

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FIR 2012-12-27

编辑：Walter Roberson 2012-12-27

在 MATLAB Online 中打开

walter i have displayed decoded image but the thing is i need encoded image to be displayed and find compression ratio

my code

clc
clear all
a=imread('cameraman.tif')
I=a;
[m,n]=size(I);
Totalcount=m*n;
cnt=1;
sigma=0;
%computing the cumulative probability.
for i=0:255
    k=I==i;
    count(cnt)=sum(k(:))
    pro(cnt)=count(cnt)/Totalcount;
    sigma=sigma+pro(cnt);
    cumpro(cnt)=sigma;
    cnt=cnt+1;
end;
symbols = [0:255];
%Huffman code Dictionary
dict = huffmandict(symbols,pro);
%function which converts array to vector
vec_size = 1;
for p = 1:m
    for q = 1:n
        newvec(vec_size) = I(p,q);
        vec_size = vec_size+1;
    end
end
%Huffman Encodig
hcode = huffmanenco(newvec,dict);
%Huffman Decoding
dhsig1 = huffmandeco(hcode,dict);
% convertign dhsig1 double to dhsig uint8
dhsig = uint8(dhsig1);
%vector to array conversion
dec_row=sqrt(length(dhsig));
dec_col=dec_row;
%variables using to convert vector 2 array
arr_row = 1;
arr_col = 1;
vec_si = 1;
for x = 1:m
    for y = 1:n
        back(x,y)=dhsig(vec_si);
        arr_col = arr_col+1;
        vec_si = vec_si + 1;
    end
    arr_row = arr_row+1;
end
imshow(back),title('decoded_Image')