function Y = Bianhuan(X)
[m,n] = size(X);
Y = zeros(m+2,n+2);
for i = 1:m+2
    for j = 1:n+2
        if i == 1 | j == 1 | i == m+2 | j == n+2
            Y(i,j) = 0;
        else
            Y(i,j) = X(i-1,j-1);
        end
    end
end