function S = hide(F,X,G)

%        F是待加密的圖像
%        X是一個隱藏的參數
%        G是載體圖像

[m n] = size(F);
F = double(F);
G = double(G);

for i = 1:m
    for j = 1:n
        S(i,j) = X*F(i,j) + (1-X)*G(i,j);
    end
end