【图像加密】基于视觉密码学的彩色图像数字水印加密附matlab代码

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智能优化算法       神经网络预测       雷达通信       无线传感器        电力系统

信号处理              图像处理               路径规划       元胞自动机        无人机 

⛄ 内容介绍

We propose a scheme for the digital watermarking of colour images based on Visual Cryptography. According to the proposed scheme, verification information is generated using the image to be marked, watermark and a passkey. The watermark and the verification information are registered with a neutral authority. The passkey is in possession of the owner of the image. When an image ownership needs to be established, the claimed owner is asked to give the passkey. Using the test image, passkey and verification information, it is possible to generate the watermark. If the claim is true, this generated watermark should be recognisable as the original watermark.

⛄ 部分代码

clear;

clc;

close all

img=imread('baboon.jpg');

%img=imread('baboonquality1.jpg'); % reads the test image

imshare1= img(:,:,1); % test image split into three shares

imshare2= img(:,:,2); % according to colour stream

imshare3= img(:,:,3);

v= imread('rgbsecretim.png'); % reads verification image

v1= im2bw(v(:,:,1)); % generates verification information

v2= im2bw(v(:,:,2));

v3= im2bw(v(:,:,3));

seed = input('Enter pass key: '); % reads secret pass key

w1= wgen(imshare1, v1, seed); % generates the test watermark

w2= wgen(imshare2, v2, seed);

w3= wgen(imshare3, v3, seed);

w_fin = w1 +w2 + w3; % final test watermark

figure(2)

subplot(1,2,1)

imshow(w_fin); % displays test watermark

title('Test watermark')

subplot(1,2,2)

%imshow('customwmk1.png'); % displays original watermark

imshow('chinese-character.png')

title('Original watermark')

⛄ 运行结果

⛄ 参考文献

[1] 王慧琴, 李人厚, 王志雄. 基于DCT域的加密二值图像数字水印新算法[J]. 小型微型计算机系统, 2003(1):4.

[2] 彭嘉星. 基于混沌的数字彩色图像加密及软硬件实现[D]. 广东工业大学, 2016.

[3] 王慧琴, 李人厚. 基于人类视觉系统的数字水印技术的理论框架[J]. 计算机工程, 2002, 28(9):3.

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