huffman encoding for image compression

i am using the following code for huffman encoding-

img = imread('xyz.jpg');
Image = rgb2gray(img);
Image = Image(:);
[N M] = size(Image)
Count = zeros(256,1)
for i = 1:N
 for j = 1:M
       Count(Image(i,j)+1)=Count(Image(i,j)+1)+1;
  end
end
prob = Count/(M*N)
symbols = 1:256;
[dict,avglen] = huffmandict(symbols,prob); 
comp = huffmanenco(Image,dict);

but i am getting the following error-

Error using huffmanenco (line 86)
The Huffman dictionary provided does not have the codes for all the input signals.
Error in Untitled2 (line 14)
comp = huffmanenco(Image,dict);

please suggest the required changes

[Francesco Grauso]

Replace: symbols = 1:256;

with: symbols = 0:255;

[Swarnali Sadhukhan]

clc;

clear all;

close all;

warning off;

x = imread('brain.jpg');

img=imresize(x,[256 256]);

Image = rgb2gray(img);

%Image = Image(:);

[M N] = size(Image)

Count = 0:255;

for i = 1:M

for j = 1:N

Count(Image(i,j)+1)=Count(Image(i,j)+1)+1;

end

end

prob = Count/(M*N);

symbols = 0:255;

[dict,avglen] = huffmandict(symbols,prob);

comp = huffmanenco(Image,dict);

figure,imshow(comp); title('encoded.JPG');

[Swarnali Sadhukhan]

Error using huffmandict (line 107)

The sum of elements of the probability

vector must be 1

Error in huffman (line 19)

[dict,avglen] =

huffmandict(symbols,prob);

I am getting this error .How can I solve this?

Answer 1

[reb rebz]

img = imread('xyz.jpg');
Image = rgb2gray(img);
Image = Image(:);
[N M] = size(Image)
Count = zeros(256,1)
for i = 1:N
 for j = 1:M
       Count(Image(i,j)+1)=Count(Image(i,j)+1)+1;
  end
end
prob = Count/(M*N)
symbols = 0:255;
[dict,avglen] = huffmandict(symbols,prob); 
comp = huffmanenco(Image,dict)

[Islam Abu Tabikh]

Did you know how ???

Answer 2

[satyendra kumar]

i am using the following code for huffman encoding-

clear all
clc
A=imread('cameraman.tif');
A1=double(A(:));
[p,symbols]=hist(A1,unique(A1));

p=p/sum(p);

[dict,avglen] = huffmandict(symbols,p); 
comp = huffmanenco(A1,dict);

Answer 3

[SS]

can i use huffman coding for both lossy and lossless image compression??

[Ahmed]

yes you can