clear;
%装入原图像1
load woman;
I=X;
%小波函数
type = 'db1';
% 2维离散Daubechies小波变换
[CA1, CH1, CV1, CD1] = dwt2(I,type);
C1 = [CH1 CV1 CD1];
%系数矩阵大小
[length1, width1] = size(CA1);
[M1, N1] = size(C1);
% 定义阈值T1
T1 =50;
alpha = 0.2;
%在图像中加入水印
for counter2 = 1: 1: N1
for counter1 = 1: 1: M1
if( C1(counter1, counter2) > T1 )
marked1(counter1,counter2) = randn(1,1);
NEWC1(counter1, counter2) = double( C1(counter1, counter2) ) +...
alpha * abs( double( C1(counter1, counter2) ) ) * marked1(counter1,counter2) ;
else
marked1(counter1, counter2) = 0;
NEWC1(counter1, counter2) = double( C1(counter1, counter2) );
end;
end;
end;
%重构图像
NEWCH1 = NEWC1(1:length1, 1:width1);
NEWCV1 = NEWC1(1:length1, width1+1:2*width1);
NEWCD1 = NEWC1(1:length1, 2*width1+1:3*width1);
R1 = double( idwt2(CA1, NEWCH1, NEWCV1, NEWCD1, type) );
%分离水印
watermark1 = double(R1) - double(I);
figure(1);
subplot(1,2,1);
image(I);
axis('square');
title('原始图像');
subplot(1,2,2);
imshow(R1/250);
axis('square');
title('Daubechies小波变换后图像');
figure(2);
imshow(watermark1*10^16);
axis('square');
title('水印图像');
% 水印检测
newmarked1 = reshape(marked1, M1*N1, 1);
% 检测阈值
T2 = 60;
for counter2 = 1: 1: N1
for counter1 = 1: 1: M1
if( NEWC1(counter1, counter2) >T2 )
NEWC1X(counter1, counter2) = NEWC1(counter1, counter2);
else
NEWC1X(counter1, counter2) = 0;
end;
end;
end;
NEWC1X = reshape(NEWC1X, M1*N1, 1);
correlation1 = zeros(1000,1);
for corrcounter = 1: 1: 1000
if( corrcounter == 500)
correlation1(corrcounter,1) = NEWC1X'*newmarked1 / (M1*N1);
else
rnmark = randn(M1*N1,1);
correlation1(corrcounter,1) = NEWC1X'*rnmark / (M1*N1);
end;
end;
% 计算阈值
originalthreshold = 0;
for counter2 = 1: 1: N1
for counter1 = 1: 1: M1
if( NEWC1(counter1, counter2) > T2 )
originalthreshold = originalthreshold + abs( NEWC1(counter1, counter2) );
end;
end;
end;
originalthreshold = originalthreshold * alpha / (2*M1*N1);
corrcounter = 1000;
originalthresholdvector = ones(corrcounter,1) * originalthreshold;
figure(3);
plot(correlation1, '-');
hold on;
plot(originalthresholdvector, '--');
title('原始的加水印图像');
xlabel('水印');
ylabel('检测响应');
小波分析理论与Matlab实现 （153个子文件） 
program_19_01.m 2KB program_11_14.m 2KB program_04_01.m 2KB program_11_10.m 2KB program_16_04.m 2KB program_16_03.m 2KB program_16_01.m 2KB program_02_01.m 1KB program_20_1.m 1KB program_16_07.m 1KB program_16_02.m 1KB program_13_14.m 1KB program_10_16.m 1KB program_16_06.m 1KB program_16_05.m 1KB program_09_10.m 1KB program_16_14.m 1KB program_16_08.m 1KB program_13_17.m 1KB program_11_11.m 1KB program_11_04.m 1KB program_13_01.m 1KB program_11_05.m 1KB program_17_05_SPECIAL.m 1KB program_10_13.m 1KB program_16_09.m 1022B program_09_09.m 991B program_11_06.m 986B program_17_04_SPECIAL.m 980B program_18_02_SPECIAL.m 972B program_18_01_SPECIAL.m 967B program_10_02.m 953B program_09_08.m 928B program_16_15.m 911B program_16_10.m 876B program_18_07_SPECIAL.m 862B program_18_03_SPECIAL.m 855B program_13_16.m 833B program_18_06_SPECIAL.m 813B program_16_11.m 794B program_10_09.m 778B program_16_13.m 770B program_09_05.m 767B program_16_17.m 709B program_10_03.m 696B program_11_15.m 675B program_13_20.m 672B program_14_09.m 666B program_09_06.m 656B program_17_03_SPECIAL.m 650B program_18_05_SPECIAL.m 641B program_18_04_SPECIAL.m 636B program_10_06.m 633B program_13_10.m 627B program_13_09.m 627B program_11_07.m 617B program_13_08.m 616B program_13_03.m 610B program_10_14.m 604B program_17_02_SPECIAL.m 602B program_11_13.m 590B program_16_23.m 588B program_13_22.m 581B program_01_03.m 576B program_14_11.m 572B program_13_19.m 571B program_13_15.m 567B program_17_01_SPECIAL.m 559B program_13_18.m 547B program_13_24.m 546B program_13_07.m 527B program_10_12.m 522B program_10_15.m 520B program_14_10.m 518B program_13_12.m 498B program_13_02.m 496B program_15_03.m 490B program_15_02.m 490B program_14_08.m 489B program_14_04.m 440B program_10_10.m 436B program_13_25.m 433B program_13_06.m 407B program_14_07.m 404B program_11_02.m 403B program_16_16.m 403B program_01_01.m 398B program_11_03.m 396B program_09_01.m 393B program_16_18.m 383B program_09_14.m 382B program_09_20.m 376B program_10_05.m 376B program_14_06.m 372B program_13_21.m 370B program_13_04.m 370B program_09_26.m 365B program_13_13.m 365B program_12_10.m 353B program_09_13.m 353B共 153 条
- 1
- 2
资源评论
