发布时间 : 星期日 文章图像数字水印+matlab程序更新完毕开始阅读9414497ed1f34693dbef3eca
watermarked_imageb=watermarked_image(:,:,3);
%水印图像R的分解
[Cwr,Swr]=WAVEDEC2(watermarked_imager,2,'haar');
%图像R的分解
[Cr,Sr]=WAVEDEC2(inputr,2,'haar');
%水印图像G的分解
[Cwg,Swg]=WAVEDEC2(watermarked_imageg,2,'haar');
%图像R的分解
[Cg,Sg]=WAVEDEC2(inputg,2,'haar');
%水印图像B的分解
[Cwb,Swb]=WAVEDEC2(watermarked_imageb,2,'haar');
%图像B的分解
[Cb,Sb]=WAVEDEC2(inputb,2,'haar');
%提取水印小波系数 %提取水印R的小波系数 r=0.06; for k=0:3
whr(k+1,:)=Cwr(1+size(Cwr,2)/4+k*size(Cwr,2)/16:... size(Cwr,2)/4+(k+1)*size(Cwr,2)/16)-... Cr(1+size(Cr,2)/4+k*size(Cr,2)/16:... size(Cr,2)/4+(k+1)*size(Cr,2)/16);
wvr(k+1,:)=Cwr(1+size(Cwr,2)/2+k*size(Cwr,2)/16:... size(Cwr,2)/2+(k+1)*size(Cwr,2)/16)-... Cr(1+size(Cr,2)/2+k*size(Cr,2)/16:... size(Cr,2)/2+(k+1)*size(Cr,2)/16);
wdr(k+1,:)=Cwr(1+3*size(Cwr,2)/4+k*size(Cwr,2)/16:... 3*size(Cwr,2)/4+(k+1)*size(Cwr,2)/16)-... Cr(1+3*size(Cr,2)/4+k*size(Cr,2)/16:... 3*size(Cr,2)/4+(k+1)*size(Cr,2)/16); end
whr=(whr(1,:)+whr(2,:)+whr(3,:)+whr(4,:))/(4*r); wvr=(wvr(1,:)+wvr(2,:)+wvr(3,:)+wvr(4,:))/(4*r); wdr=(wdr(1,:)+wdr(2,:)+wdr(3,:)+wdr(4,:))/(4*r); war=(Cwr(1:size(Cwr,2)/16)-Cr(1:size(Cr,2)/16))/r;
%提取水印小波系数 %提取水印G的小波系数
g=0.03; for k=0:3
whg(k+1,:)=Cwg(1+size(Cwg,2)/4+k*size(Cwg,2)/16:... size(Cwg,2)/4+(k+1)*size(Cwg,2)/16)-... Cg(1+size(Cg,2)/4+k*size(Cg,2)/16:... size(Cg,2)/4+(k+1)*size(Cg,2)/16);
wvg(k+1,:)=Cwg(1+size(Cwg,2)/2+k*size(Cwg,2)/16:... size(Cwg,2)/2+(k+1)*size(Cwg,2)/16)-... Cg(1+size(Cg,2)/2+k*size(Cg,2)/16:... size(Cg,2)/2+(k+1)*size(Cg,2)/16);
wdg(k+1,:)=Cwg(1+3*size(Cwg,2)/4+k*size(Cwg,2)/16:... 3*size(Cwg,2)/4+(k+1)*size(Cwg,2)/16)-... Cg(1+3*size(Cg,2)/4+k*size(Cg,2)/16:... 3*size(Cg,2)/4+(k+1)*size(Cg,2)/16); end
whg=(whg(1,:)+whg(2,:)+whg(3,:)+whg(4,:))/(4*g); wvg=(wvg(1,:)+wvg(2,:)+wvg(3,:)+wvg(4,:))/(4*g); wdg=(wdg(1,:)+wdg(2,:)+wdg(3,:)+wdg(4))/(4*g); wag=(Cwg(1:size(Cwg,2)/16)-Cg(1:size(Cg,2)/16))/g;
%提取水印小波系数 %提取水印B的小波系数 b=0.12; for k=0:3
whb(k+1,:)=Cwb(1+size(Cwb,2)/4+k*size(Cwb,2)/16:... size(Cwb,2)/4+(k+1)*size(Cwb,2)/16)-... Cb(1+size(Cb,2)/4+k*size(Cb,2)/16:... size(Cb,2)/4+(k+1)*size(Cb,2)/16); wvb(k+1,:)=Cwb(1+size(Cwb,2)/2+k*size(Cwb,2)/16:... size(Cwb,2)/2+(k+1)*size(Cwb,2)/16)-... Cb(1+size(Cb,2)/2+k*size(Cb,2)/16:... size(Cb,2)/2+(k+1)*size(Cb,2)/16);
wdb(k+1,:)=Cwb(1+3*size(Cwb,2)/4+k*size(Cwb,2)/16:... 3*size(Cwb,2)/4+(k+1)*size(Cwb,2)/16)-... Cb(1+3*size(Cb,2)/4+k*size(Cb,2)/16:... 3*size(Cb,2)/4+(k+1)*size(Cb,2)/16); end
whb=(whb(1,:)+whb(2,:)+whb(3,:)+whb(4,:))/(4*b); wvb=(wvb(1,:)+wvb(2,:)+wvb(3,:)+wvb(4,:))/(4*b); wdb=(wdb(1,:)+wdb(2,:)+wdb(3,:)+wdb(4,:))/(4*b); wab=(Cwb(1:size(Cwb,2)/16)-Cb(1:size(Cb,2)/16))/b;
%重构水印图像 cwr=[war,whr,wvr,wdr];
swr(:,1)=[sqrt(size(war,2)),sqrt(size(war,2)),2*sqrt(size(war,2))]; swr(:,2)=[sqrt(size(war,2)),sqrt(size(war,2)),2*sqrt(size(war,2))]; wr = waverec2(cwr,swr,'haar');
cwg=[wag,whg,wvg,wdg];
swg(:,1)=[sqrt(size(wag,2)),sqrt(size(wag,2)),2*sqrt(size(wag,2))]; swg(:,2)=[sqrt(size(wag,2)),sqrt(size(wag,2)),2*sqrt(size(wag,2))]; wg=waverec2(cwg,swg,'haar');
cwb=[wab,whb,wvb,wdb];
swb(:,1)=[sqrt(size(wab,2)),sqrt(size(wab,2)),2*sqrt(size(wab,2))]; swb(:,2)=[sqrt(size(wab,2)),sqrt(size(wab,2)),2*sqrt(size(wab,2))]; wb=waverec2(cwb,swb,'haar');
%将R，G，B叠加 temp=size(wr);
pic=zeros(temp(1),temp(2),3); for i=1:temp(1); for j=1:temp(2);
pic(i,j,1)=wr(i,j); pic(i,j,2)=wg(i,j); pic(i,j,3)=wb(i,j); end end
output=uint8(round(pic));
%转化为uint8
watermark_image_uint8=uint8(output);
imwrite(watermark_image_uint8,'watermark.bmp','bmp'); figure(2);
imshow(watermark_image_uint8); title('提取出的水印');
原始图像
加入小波的图像
小波 提取的小波