小波分析毕业论文

不用谢我，我是雷锋(1)小波模极大值重构 MATLAB代码_天天向上_新浪博客 [signal,swa,swd,ddw,wpeak]=wave_peak(points,level,Lo_D,Hi_D,Lo_R,Hi_R,offset)% 该函数用于读取ecg信号，找到小波变换模极大序列warning off;ecgdata=load(''); %需要分析的信号，自己加plot(ecgdata(1:points)),grid on,axis tight,axis([1,points,-50,300]);signal=ecgdata(1:points)'+offset;% 信号的小波变换，按级给出概貌和细节的波形[swa,swd] = swt(signal,level,Lo_D,Hi_D);figure;subplot(level,1,1); plot(real(signal)); grid on;axis tight;for i=1:level subplot(level+1,2,2*(i)+1); plot(swa(i,:)); axis tight;grid on;xlabel('time'); ylabel(strcat('a ',num2str(i))); subplot(level+1,2,2*(i)+2); plot(swd(i,:)); axis tight;grid on;ylabel(strcat('d ',num2str(i)));end%求小波变换的模极大值及其位置ddw=zeros(size(swd));pddw=ddw;nddw=ddw;posw=swd.*(swd>0);pdw=((posw(:,1:points-1)-posw(:,2:points))<0);pddw(:,2:points-1)=((pdw(:,1:points-2)-pdw(:,2:points-1))>0);negw=swd.*(swd<0);ndw=((negw(:,1:points-1)-negw(:,2:points))>0);nddw(:,2:points-1)=((ndw(:,1:points-2)-ndw(:,2:points-1))>0);ddw=pddw|nddw;ddw(:,1)=1;ddw(:,points)=1;wpeak=ddw.*swd;wpeak(:,1)=wpeak(:,1)+1e-10;wpeak(:,points)=wpeak(:,points)+1e-10;%按级给出小波变换模极大的波形figure;for i=1:level subplot(level,1,i); plot(wpeak(i,:)); axis tight;grid on;ylabel(strcat('j= ',num2str(i)));end注：运行此程序时一定要将待处理信号添加进去，程序中的红色部分。