How do I use encoder commands for Images in MATLAB

Hi everbody

I am trying to encode any image input. You can reach belong code MATLAB itself, except the cameraman.tif part. The problem is that when I write below code, I am getting 1x512 double output. My input is 256x256 double. I need to compare my input and output, but I can not use imshow command for output. Can you help me which part I need to change in for loop or any other part?

clear all

g=[1 0 0;1 1 1]; %generator polynomials

[n,K]=size(g);

m=K-1; %number of registers

state=zeros(1,m); %set registers to zero

I = imread('cameraman.tif');

I_in = im2double(I);

[trash,h]=size(I_in);

outputy=[];

for x=1:h

input=I_in(1,x);

for i=1:n

output(i) = g(i,1)*input;

for j = 2:K

z=g(i,j)*state(j-1);

output(i) = xor(output(i),z);

end;

end

state = [input,state(1:m-1)];

outputy=[outputy,output];

end

outputy;