hide3.m

关于图像隐藏的几个例程。属于matlab图像处理的内容

function hide()
m=input('please input the lock password:');
B=imread('E:\chan\mat\b.bmp','bmp');
imshow(B);pause;close;
[Bx,By,Bz]=size(B);
C=imread('E:\chan\mat\cc.bmp','bmp');
imshow(C);pause;close;
[Cx,Cy,Cz]=size(C);
%%密码分解
m1=fix(m/100);     
m2=m-(fix(m/100))*100;
%%检测
E=bitand(C,240);         
F=bitor(bitshift(bitand(C,240),-4),240);
imshow(E);pause;close;
imshow(F);pause;close;
%%构建CC
for i=1:Bx
    for j=1:By
        for k=1:Bz
            if (i>m1)&(i<=m1+Cx)&(j>m2)&(j<=m2+Cy)
                CC(i,j,k)=C(i-m1,j-m2,k);
            else
                CC(i,j,k)=uint8(0);
            end
        end
    end
end
%%隐藏
b=bitand(B,240);
c=bitshift(bitand(CC,240),-4);
D=bitor(b,c);
imshow(D);pause;close;
imwrite(D,'E:\chan\mat\d.bmp')
n=input('please input the unlock password:');
%%提取
n1=fix(n/100);  
n2=n-(fix(n/100))*100;
U=bitshift((bitand(D,15)),4);
U=U((n1+1):n1+Cx,(n2+1):n2+Cy,1:Cz);
size(U)
imwrite(U,'E:\chan\mat\e.bmp')
imshow(U);pause;close;
sprintf('ok')