i want to restore the original binary image S by xor the two shares R1,R2

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dhivya 2023-3-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1936879-i-want-to-restore-the-original-binary-image-s-by-xor-the-two-shares-r1-r2

评论： Walter Roberson 2023-3-28

S = imread('binary.png');
C = imread('text input.png');
[m, n] = size(S);
no = 2;
beta = 1;
R1 = zeros(m, n);
R2 = zeros(m, n);
for i = 1:m
    for j = 1:n
        d = rand;
        if d < beta
            "function T = algo2(S(i, j), no)";
            R1(i, j) = T(1);
            R2(i, j) = T(2);
        else
            if mod(n*C(i, j), no) == 0
                R1(i, j) = C(i, j);
                R2(i, j) = C(i, j);
            else
                f = randi([1 no]);
                for k = 1:n
                    if k == f
                        R1(i, j) = 1 - C(i, j);
                        R2(i, j) = 1 - C(i, j);
                    elseif k < f
                        R1(i, j) = C(i, j);
                        R2(i, j) = C(i, j);
                    else
                        R1(i, j) = C(i, j);
                        R2(i, j) = C(i, j);
                    end
                end
            end
        end
    end
end
S_restored = bitxor(R1, R2);
imshow(S_restored);

this is the code for restore the original bianry image,in this the the line "function T = algo2(S(i, j), no)"; calls the another code algo2 for the 2 pixel shares...but the resulting image is full of black.i tried so many times to rectify it.help to get rid of the issue

code for algo2:

function T = algo2(S, n)
S=imread('text input.png');
meven=[0 0 0;
    0 1 1;
    1 0 1;
    1 1 0];
modd=[0 0 1;
    0 1 0;
    1 0 0;
    1 1 1];
   no=1;
   y =zeros(size(S));
   R=zeros(size(S));
   l=zeros(size(S));
for i = 1:size(S,1)
    for j = 1:size(S,2)
        if (S(i, j) == 0)
            r=rand([no,2^no-1]);
            disp(r)
            ro=round(r*(size(meven,1)-1))+1;
            
            disp(ro)
            R(i,j)=meven(ro,1);
            l(i,j)=meven(ro,2);
          
        else
            r=rand([no,2^no-1]);
            disp(r)
            ro = round(r*(size(modd,1)-1))+1;
              
            disp(ro)
            R(i,j)=modd(ro,1);
            l(i,j)=modd(ro,2);
             
        end
     end
end
        y(i,j)=S(i,j);
        
  