java.txt

基于java的图像数字水印

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) );希望对大家有所帮助