clear?all;
%?read?in?watermarked?image
file_name=‘lsb_watermarked.bmp‘;
Y=imread（file_name）;
%加噪
Y=uint8（Y）;
CX=imnoise（Y‘speckle‘0.005）;??%高斯‘gaussian‘0-0.010-0.02?%椒鹽‘salt?&?pepper‘0.010.030.05?%乘積性‘speckle‘0.020.040.06
GS=imnoise（Y‘gaussian‘0.005）;
JY=imnoise（Y‘salt?&?pepper‘0.005）;
CX=double（CX）;
figure（1）;
imshow（CX[]）;
titl