extract hiden text from image

what the problem in this program to extract hiden text

s = imread('D:\desrt.jpg');

%s= getimage('D:\LSB\stegImage17.jpg');

%c = getframe(handles.axes1);

height = size(s,1);

width = size(s,2);

m = 800;

k = 1

if(k<=m)

LSB = mod(double(s(i,j)), 2);

s(i,j)=s(i,j)+LSB+b(k);

k=k+1;

end

binaryVector = b;

binValues = [ 128 64 32 16 8 4 2 1 ];

binaryVector = binaryVector(:);

if mod(length(binaryVector),8) ~= 0

error('Length of binary vector must be a multiple of 8.');

end

binMatrix = reshape(binaryVector,8,100);

display(binMatrix);

textString = char(binValues*binMatrix);

disp(textString);

[Adam Danz]

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