脆弱水印相关算法及代码实现

%%%%%%%%%%% %file_name='shuiy.jpg'; %message=double(imread(file_name)); %mm=size(message,1); %nm=size(message,2); %%%%%%%%%%% file_name='dwt_watermarked.bmp'; watermarked_image=double(imread(file_name)); % watermarked_image(80:101,177:184)=255; % watermarked_image(84:105,85:93)=255; % watermarked_image(14:23,105:151)=255; % watermarked_image(105:134,241:248)=255; % imshow(uint8(watermarked_image)); mw=size(watermarked_image,1); nw=size(watermarked_image,2); [ca1,ch1,cv1,cd1]=dwt2(watermarked_image,'haar'); file_name='eee.bmp'; cover_object=double(imread(file_name)); [ca2,ch2,cv2,cd2]=dwt2(cover_object,'haar'); watermarkr=ca1-ca2; watermark=ones(mm); for i=1:mm for j=1:nm if(watermarkr(i,j)~=0) watermark(i,j)=0; end end end watermark=uint8(watermark); figure imshow(watermark,[]); title('recovered watermark') orig_watermark=imread('shuiy3.bmp'); sim=corr2(orig_watermark,watermark) imwrite(watermark,'watermark_r.jpg','jpg');