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