基于Arnold变换的DCT域数字图像水印算法研究(14)

西安文理学院本科毕业设计（论文）

disp('8—直方图均衡化');

d=input('please input you choice(请输入您的选择):'); switch d case 0 figure;

imshow(watermarked_image);

title('未受到攻击的嵌有水印的载体图像'); case 1

watermarked_image=imnoise(watermarked_image,'salt & pepper',0.005);%椒盐噪声 % watermarked_image=medfilt2(J2,[3 3]);

imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image); title('椒盐噪声'); case 2

watermarked_image=imnoise(watermarked_image,'gaussian',0,0.0005); imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image,[ ]); title('adding u noise 添加高斯噪声'); case 3

H=fspecial('gaussian',[3,3],1);

watermarked_image=imfilter(watermarked_image,H); imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image,[ ]); title('through filter [10,10] 滤波');

case 4 % watermarked_image(1:32,1:32)=512; %1/16比例剪切 %watermarked_image(1:72,1:72)=512; %9/64比例剪切 %watermarked_image(1:64,1:64)=512; %1/8比例剪切 % watermarked_image(1:200,1:200)=512; %/64比例剪切 watermarked_image(1:256,1:256)=512; %%1/2比例剪切 imwrite(watermarked_image,'watermarked_image.bmp','bmp')

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西安文理学院本科毕业设计（论文）

figure;

imshow(watermarked_image); title('cutting part of the image ???D'); case 5

% watermarked_image=imresize(watermarked_image,1/2,'bicubic');

% watermarked_image=imresize(watermarked_image,2); %先缩小1/2再放大原来大小

% watermarked_image=imresize(watermarked_image,2);

% watermarked_image=imresize(watermarked_image,1/2); %先放大原来的2倍再缩小到原图大小

% watermarked_image=imresize(watermarked_image,3;

% watermarked_image=imresize(watermarked_image,1/3); %先放大到原来的3倍再缩小到原图大小

watermarked_image=imresize(watermarked_image,4);

watermarked_image=imresize(watermarked_image,1/4); %先放大到原来的4倍再缩小到原图大小

imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image); title('放大2倍');

case 6 watermarked_image=imrotate(watermarked_image,5,'bilinear','crop'); imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image); title('rotate 旋转'); case 7

q=input('请输入你想要的压缩率:');

imwrite(watermarked_image,'watermarked_image.bmp','jpg','quality',q); watermarked_image=imread('watermarked_image.bmp'); imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image); title('JPEG Image 压缩'); case 8

watermarked_image=histeq( watermarked_image);

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西安文理学院本科毕业设计（论文）

% imwrite(watermarked_image,'F:\\watermarked_image.bmp','bmp'); imwrite(watermarked_image,'watermarked_image.bmp','bmp') figure;

imshow(watermarked_image); title('直方图均衡化'); otherwise

disp('你输入的是无效数字，图像未受攻击，将直接检测水印'); figure;

imshow(watermarked_image);

title('未受攻击的嵌有水印的载体图像'); end

elapsed_time=cputime-start_time,

start_time=cputime;

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