8-EMD端点效应优化（最大相关波形延拓法）（MATLAB视频）
8-EMD端点效应优化（最大相关波形延拓法）（MATLAB视频）百度网盘链接：https://pan.baidu.com/s/1bYIuE0r10SEVqMSWDSTZhg
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% 最大相关波形延拓法
clc,clear,close all % 清理命令区、清理工作区、关闭显示图形
warning off % 消除警告
format short % 数据类型
tic % 运算计时
%% 初始化信号
= gen_signal(5e3, 1e3);
figure(1), plot(t,signal,'linewidth',1)
xlabel('t');ylabel('实际信号');grid on;
%% 最大相关波形延拓法
%% 极值点和过零点位置提取
= extr(signal, t); % 极值点和过零点位置提取
figure(2), plot(t,signal,'linewidth',1);
hold on
plot(t(indmin), signal(indmin), 'm.-')
plot(t(indmax), signal(indmax), 'r.-')
plot(t(indzer), signal(indzer), 'g.-')
xlabel('t');ylabel('实际信号');grid on;
legend('原始信号','极小值','极大值','过零点')
axis tight;
hold off;
%% 最大相关波形延拓法
flag=0;% =0就是左端点沿拓；=1就是右端点沿拓
signal_corr = maxCorr_find_Si(signal, t, 0);
newdata = signal_corr;
welddata_left = weld( signal, newdata, indmax, 0 );
flag=1;% =0就是左端点沿拓；=1就是右端点沿拓
signal_corr = maxCorr_find_Si(signal, t, 1);
newdata = signal_corr(end:-1:1);
welddata_right = weld( signal, newdata, indmax, 1 );
welddata = ;
figure(3),hold on
plot(1:length(welddata_left), welddata_left,'r.-');
plot(length(welddata_left)+1: length(welddata_left)+length(signal(indmax(1):indmax(end))),signal(indmax(1):indmax(end)),'b-');
plot(length(welddata)-length(welddata_right)+1:length(welddata),welddata_right,'r.-');
xlabel('t');ylabel('实际信号');grid on;
axis tight;
hold off;关键性函数如下：function signal_corr = maxCorr_find_Si(signal, t, flag)
% 最大相关波形延拓法
if(flag==0)
k=1;
= extr(signal, t); % 极值点和过零点位置提取
for j=1:length(indmax)
if(indmax(j)>indzer(1))
break;
end
end
w0 = signal( indzer(1):indmax(j+1) );
h0 = signal(indmax(j)) - signal(1);
for i=2:length(indmax)
signal = signal + h0-signal(indmax(i));
= extr(signal, t); % 极值点和过零点位置提取
if(isempty(indzeri))
break;
else
for j=1:length(indmaxi)
if(indmaxi(j)>indzeri(1))
break;
end
end
w = signal( indzeri(1):indmaxi(j+1) );
w = imresize(w, size(w0));
xx = corrcoef( w0, w );
Corr1(k,1) = xx(1,2);
w1 = signal( indmaxi(i-1):indmaxi(i) );
w1 = imresize(w1, size(w0));
Corr2(k,:) = w1;
k=k+1;
end
end
= max(Corr1);
signal_corr = Corr2(index,:);
elseif(flag==1)
k=1;
signal = signal(end:-1:1);
= extr(signal, t); % 极值点和过零点位置提取
for j=1:length(indmax)
if(indmax(j)>indzer(1))
break;
end
end
w0 = signal( indzer(1):indmax(j+1) );
h0 = signal(indmax(j)) - signal(1);
for i=2:length(indmax)
signal = signal + h0-signal(indmax(i));
= extr(signal, t); % 极值点和过零点位置提取
if(isempty(indzeri))
break;
else
for j=1:length(indmaxi)
if(indmaxi(j)>indzeri(1))
break;
end
end
w = signal( indzeri(1):indmaxi(j+1) );
w = imresize(w, size(w0));
xx = corrcoef( w0, w );
Corr1(k,1) = xx(1,2);
w1 = signal( indmaxi(i-1):indmaxi(i) );
w1 = imresize(w1, size(w0));
Corr2(k,:) = w1;
k=k+1;
end
end
= max(Corr1);
signal_corr = Corr2(index,:);
end
请问这个左右端点的延拓是要分开进行吗？还是就按照您的整个程序就可以成功呢？ 算法小白3 发表于 2020-4-23 10:16
function= extr(x,t);
%= EXTR(x,t) finds extrema and zero-crossings
%
检查变量的维度是否一致，单独调试一下就知道了。
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