【图像隐藏】基于DCT和FFT数字水印嵌入+攻击+提取含Matlab源码

1 简介

文章对DCT(离散余弦变换)和FFT域图像数字水印算法进行了研究,并用matlab工具进行实验,结果表明该算法使水印的嵌入达到了较好的鲁棒性和不可见性.​

2 部分代码

function [message_vector,Mo,No] = dwtrecover(watermrkd_img,k,message)​watermarked_image= watermrkd_img;% determine size of watermarked imageMw=size(watermarked_image,1);           %HeightNw=size(watermarked_image,2);           %Width Ow=size(watermarked_image,3);% read in original watermark​orig_watermark=double(message); % determine size of original watermarkMo=size(orig_watermark,1);  %HeightNo=size(orig_watermark,2);  %Width % read in key for PN generatorfile_name='_key.bmp';key=double(imread(file_name))./256;  % reset MATLAB's PN generator to state "key"j = 1;for i =1:length(key)rand('state',key(i,j));end​message_vector=ones(1,Mo*No);[cA1,cH1,cV1,cD1] = dwt2(watermarked_image,'haar');  % add pn sequences to H1 and V1 componants when message = 0 for (kk=1:length(message_vector))    pn_sequence_h=round(2*(rand(Mw/2,Nw/2,Ow)-0.5));    pn_sequence_v=round(2*(rand(Mw/2,Nw/2,Ow)-0.5));        if (message(kk) == 0)%         cH1(:,:,1)=cH1(:,:,1)+k*pn_sequence_h;%         cV1(:,:,1)=cV1(:,:,1)+k*pn_sequence_v;        cH1=cH1+k*pn_sequence_h;        cV1=cV1+k*pn_sequence_v;    end  ​ cor_h(kk)=corr2(pn_sequence_h(:,:,1),cH1(:,:,1));cor_v(kk)=corr2(pn_sequence_v(:,:,1),cV1(:,:,1));    if cor_h(kk) > cor_v(kk)        message_vector(kk)=0;    else        message_vector(kk)=1;    endendend​​​​

3 仿真结果

4 参考文献

[1]吴和静, 闵昆龙, 刘芳,等. 基于DCT域的图像数字水印算法及matlab实现[J]. 中国科技信息, 2014(9):2.

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