mirror of
https://github.com/This-weiyuqing/ECGTest.git
synced 2026-10-18 11:14:07 +08:00
388 lines
13 KiB
Matlab
388 lines
13 KiB
Matlab
level=4;
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sr=360;
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ecg_i=DenoisingSignal';
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swa=zeros(4,points);%存储近似信息
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swd=zeros(4,points);%存储细节信息
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%计算近似系数和细节系数
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%低通滤波器 1/4 3/4 3/4 1/4
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%高通滤波器 -1/4 -3/4 3/4 1/4
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%二进样条小波
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for i=1:points-3
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swa(1,i+3)=1/4*ecg_i(i+3-2^0*0)+3/4*ecg_i(i+3-2^0*1)+3/4*ecg_i(i+3-2^0*2)+1/4*ecg_i(i+3-2^0*3);
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swd(1,i+3)=-1/4*ecg_i(i+3-2^0*0)-3/4*ecg_i(i+3-2^0*1)+3/4*ecg_i(i+3-2^0*2)+1/4*ecg_i(i+3-2^0*3);
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end
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j=2;
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while j<=level
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for i=1:points-24
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swa(j,i+24)=1/4*swa(j-1,i+24-2^(j-1)*0)+3/4*swa(j-1,i+24-2^(j-1)*1)+3/4*swa(j-1,i+24-2^(j-1)*2)+1/4*swa(j-1,i+24-2^(j-1)*3);
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swd(j,i+24)=-1/4*swa(j-1,i+24-2^(j-1)*0)-3/4*swa(j-1,i+24-2^(j-1)*1)+3/4*swa(j-1,i+24-2^(j-1)*2)+1/4*swa(j-1,i+24-2^(j-1)*3);
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end
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j=j+1;
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end
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%*********************求正负极大值对**********************%
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ddw=zeros(size(swd));
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pddw=ddw;
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nddw=ddw;
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%小波系数的大于0 的点
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posw=swd.*(swd>0);
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%斜率大于0
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pdw=((posw(:,1:points-1)-posw(:,2:points))<0);
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%正极大值点
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pddw(:,2:points-1)=((pdw(:,1:points-2)-pdw(:,2:points-1))>0);
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%小波系数小于0 的点
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negw=swd.*(swd<0);
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%斜率小于0
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ndw=((negw(:,1:points-1)-negw(:,2:points))>0);
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%负极大值点
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nddw(:,2:points-1)=((ndw(:,1:points-2)-ndw(:,2:points-1))>0);
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%或运算
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ddw=pddw|nddw;
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ddw(:,1)=1;
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ddw(:,points)=1;
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%求出极值点的值,其它点置0
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wpeak=ddw.*swd;
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wpeak(:,1)=wpeak(:,1)+1e-10;
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wpeak(:,points)=wpeak(:,points)+1e-10;
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interva2=zeros(1,points);
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intervaqs=zeros(1,points);
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Mj1=wpeak(1,:);
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Mj3=wpeak(3,:);
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Mj4=wpeak(4,:);
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%使用Mj3 3 层细节系数判断R 波
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posi=Mj3.*(Mj3>0);
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%求正极大值的平均
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thposi=(max(posi(1:round(points/4)))+max(posi(round(points/4):2*round(points/4)))+max(posi(2*round(points/4):3*round(points/4)))+max(posi(3*round(points/4):4*round(points/4))))/4;
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posi=(posi>thposi/3);
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nega=Mj3.*(Mj3<0);
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%求负极大值的平均
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thnega=(min(nega(1:round(points/4)))+min(nega(round(points/4):2*round(points/4)))+min(nega(2*round(points/4):3*round(points/4)))+min(nega(3*round(points/4):4*round(points/4))))/4;
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nega=-1*(nega<thnega/4);
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%找出非0 点
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interva=posi+nega;
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loca=find(interva);
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for i=1:length(loca)-1
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if abs(loca(i)-loca(i+1))<80
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diff(i)=interva(loca(i))-interva(loca(i+1));
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else
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diff(i)=0;
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end
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end
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%找出极值对
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loca2=find(diff==-2);
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%负极大值点
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interva2(loca(loca2(1:length(loca2))))=interva(loca(loca2(1:length(loca2))));
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%正极大值点
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interva2(loca(loca2(1:length(loca2))+1))=interva(loca(loca2(1:length(loca2))+1));
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intervaqs(1:points-10)=interva2(11:points);
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countR=zeros(1,1);
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countQ=zeros(1,1);
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countS=zeros(1,1);
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mark1=0;
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mark2=0;
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mark3=0;
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i=1;
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j=1;
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Rnum=0;
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%*********求正负极值对过零。即R 波峰值，并检測出QRS 波起点及终点******%
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while i<points
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if interva2(i)==-1
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mark1=i;
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i=i+1;
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while(i<points&interva2(i)==0)
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i=i+1;
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end
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mark2=i;
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%求极大值对的过零点
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mark3= round((abs(Mj3(mark2))*mark1+mark2*abs(Mj3(mark1)))/(abs(Mj3(mark2))+abs(Mj3(mark1))));
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%R 波极大值点
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R_result(j)=mark3;
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countR(mark3)=1;
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%求出QRS 波起点
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kqs=mark3;
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markq=0;
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while (kqs>1)&&( markq< 3)
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if Mj1(kqs)~=0
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markq=markq+1;
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end
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kqs= kqs -1;
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end
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countQ(kqs)=-1;
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%求出QRS 波终点
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kqs=mark3;%-10
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marks=0;
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while (kqs<points)&&( marks<3)
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if Mj1(kqs)~=0
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marks=marks+1;
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end
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kqs= kqs+1;
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end
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countS(kqs)=-1;
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i=i+50;
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j=j+1;
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Rnum=Rnum+1;
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end
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i=i+1;
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end
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%********************删除多检点，补偿漏检点**************************%
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num2=1;
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while(num2~=0)
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num2=0; %j=3,过零点
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R=find(countR);
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%过零点间隔
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R_R=R(2:length(R))-R(1:length(R)-1);
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RRmean=mean(R_R);
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%当两个R 波间隔小于0.4RRmean 时,去掉值小的R 波
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for i=2:length(R)
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if (R(i)-R(i-1))<=0.4*RRmean
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num2=num2+1;
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if ecg_i(R(i))>ecg_i(R(i-1))
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countR(R(i-1))=0;
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else
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countR(R(i))=0;
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end
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end
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end
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end
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num1=2;
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while(num1>0)
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num1=num1-1;
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R=find(countR);
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R_R=R(2:length(R))-R(1:length(R)-1);
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RRmean=mean(R_R);
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%当发现R 波间隔大于1.6RRmean 时,减小阈值,在这一段检測R 波
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for i=2:length(R)
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if (R(i)-R(i-1))>1.6*RRmean
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Mjadjust=wpeak(4,R(i-1)+80:R(i)-80);
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points2=(R(i)-80)-(R(i-1)+80)+1;
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%求正极大值点
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adjustposi=Mjadjust.*(Mjadjust>0);
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adjustposi=(adjustposi>thposi/4);
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%求负极大值点
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adjustnega=Mjadjust.*(Mjadjust<0);
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adjustnega=-1*(adjustnega<thnega/5);
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%或运算
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interva4=adjustposi+adjustnega;
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%找出非0 点
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loca3=find(interva4);
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diff2=interva4(loca3(1:length(loca3)-1))-interva4(loca3(2:length(loca3)));
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%假设有极大值对,找出极大值对
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loca4=find(diff2==-2);
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interva3=zeros(points2,1)';
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for j=1:length(loca4)
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interva3(loca3(loca4(j)))=interva4(loca3(loca4(j)));
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interva3(loca3(loca4(j)+1))=interva4(loca3(loca4(j)+1));
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end
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mark4=0;
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mark5=0;
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mark6=0;
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while j<points2
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if interva3(j)==-1;
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mark4=j;
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j=j+1;
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while(j<points2&interva3(j)==0)
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j=j+1;
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end
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mark5=j;
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%求过零点
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mark6= round((abs(Mjadjust(mark5))*mark4+mark5*abs(Mjadjust(mark4)))/(abs(Mjadjust(mark5))+abs(Mjadjust(mark4))));
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countR(R(i-1)+80+mark6-10)=1;
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j=j+60;
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end
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j=j+1;
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end
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end
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end
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end
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%画出原图及标出检测结果
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%%%%%%%%%%%%%%%%%%%%%%%%%%开始求PT 波段
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Mj4posi=Mj4.*(Mj4>0);
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%求正极大值的平均
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Mj4thposi=(max(Mj4posi(1:round(points/4)))+max(Mj4posi(round(points/4):2*round(points/4)))+max(Mj4posi(2*round(points/4):3*round(points/4)))+max(Mj4posi(3*round(points/4):4*round(points/4))))/4;
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Mj4posi=(Mj4posi>Mj4thposi/3);
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Mj4nega=Mj4.*(Mj4<0);
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%求负极大值的平均
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Mj4thnega=(min(Mj4nega(1:round(points/4)))+min(Mj4nega(round(points/4):2*round(points/4)))+min(Mj4nega(2*round(points/4):3*round(points/4)))+min(Mj4nega(3*round(points/4):4*round(points/4))))/4;
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Mj4nega=-1*(Mj4nega<Mj4thnega/4);
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Mj4interval=Mj4posi+Mj4nega;
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Mj4local=find(Mj4interval);
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Mj4interva2=zeros(1,points);
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for i=1:length(Mj4local)-1
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if abs(Mj4local(i)-Mj4local(i+1))<80
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Mj4diff(i)=Mj4interval(Mj4local(i))-Mj4interval(Mj4local(i+1));
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else
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Mj4diff(i)=0;
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end
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end
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%找出极值对
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Mj4local2=find(Mj4diff==-2);
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%负极大值点
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Mj4interva2(Mj4local(Mj4local2(1:length(Mj4local2))))=Mj4interval(Mj4local(Mj4local2(1:length(Mj4local2))));
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%正极大值点
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Mj4interva2(Mj4local(Mj4local2(1:length(Mj4local2))+1))=Mj4interval(Mj4local(Mj4local2(1:length(Mj4local2))+1));
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mark1=0;
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mark2=0;
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mark3=0;
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Mj4countR=zeros(1,1);
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Mj4countQ=zeros(1,1);
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Mj4countS=zeros(1,1);
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flag=0;
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while i<points
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if Mj4interva2(i)==-1
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mark1=i;
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i=i+1;
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while(i<points&Mj4interva2(i)==0)
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i=i+1;
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end
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mark2=i;
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%求极大值对的过零点,在R4 中极值之间过零点就是R 点。
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mark3= round((abs(Mj4(mark2))*mark1+mark2*abs(Mj4(mark1)))/(abs(Mj4(mark2))+abs(Mj4(mark1))));
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Mj4countR(mark3)=1;
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Mj4countQ(mark1)=-1;
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Mj4countS(mark2)=-1;
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flag=1;
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end
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if flag==1
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i=i+200;
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flag=0;
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else
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i=i+1;
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end
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end
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%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%
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%figure(200);
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%plot(Mj4); %
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% title('j=4');
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%hold on;
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%plot(Mj4countR,'r');
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%plot(Mj4countQ,'g');
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%plot(Mj4countS,'g');
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%%%%%%%%%%%%%%%%%%%%%%%%%%Mj4 过 零 点 找到%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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Rlocated=find(Mj4countR);
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Qlocated=find(Mj4countQ);
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Slocated=find(Mj4countS);
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countPMj4=zeros(1,1);
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countTMj4=zeros(1,1);
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countP=zeros(1,1);
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countPbegin=zeros(1,1);
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countPend=zeros(1,1);
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countT=zeros(1,1);
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countTbegin = zeros(1,1);
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countTend = zeros(1,1);
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windowSize=100;
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%********************P 波检測********************% 、
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%Rlocated Qlocated 是在尺度4 下的坐标
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for i=2:length(Rlocated)
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flag=0;
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mark4=0;
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RRinteral=Rlocated(i)-Rlocated(i-1);
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for j=1:5:(RRinteral*2/3)
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% windowEnd=Rlocated(i)-30-j;
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windowEnd=Qlocated(i)-j;
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windowBegin=windowEnd-windowSize;
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if windowBegin<Rlocated(i-1)+RRinteral/3
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break;
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end
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%求窗内的极大极小值
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%windowposi=Mj4.*(Mj4>0);
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%windowthposi=(max(Mj4(windowBegin:windowBegin+windowSize/2))+max(Mj4(windowBegin+windowSize/2+1:windowEnd)))/2;
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[windowMax,maxindex]=max(Mj4(windowBegin:windowEnd));
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[windowMin,minindex]=min(Mj4(windowBegin:windowEnd));
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if minindex < maxindex &&((maxindex-minindex)<windowSize*2/3)&&windowMax>0.01&&windowMin<-0.1
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flag=1;
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mark4=round((maxindex+minindex)/2+windowBegin);
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countPMj4(mark4)=1;
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countP(mark4-20)=1;
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countPbegin(windowBegin+minindex-20)=-1;
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countPend(windowBegin+maxindex-20)=-1;
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end
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if flag==1
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break;
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end
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end
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if mark4==0&&flag==0 %假设没有P 波，在R 波左间隔1/3 处赋值-1
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mark4=round(Rlocated(i)-RRinteral/3);
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countP(mark4-20)=-1;
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end
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end
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%plot(countPMj4,'g');
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%********************T 波检測********************%
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clear windowBegin windowEnd maxindex minindex windowMax windowMin mark4 RRinteral;
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windowSizeQ=60;
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for i=1:length(Rlocated)-1;
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flag=0;
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mark5=0;
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RRinteral=Rlocated(i+1)-Rlocated(i);
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for j=1:5:(RRinteral*2/3)
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% windowBegin=Rlocated(i)+30+j;
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windowBegin=Slocated(i)+j;
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windowEnd =windowBegin+windowSizeQ;
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if windowEnd >Rlocated(i+1)-RRinteral/4
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break;
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end
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%%%%%求窗体内的极大极小值
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[windowMax,maxindex]=max(Mj4(windowBegin:windowEnd));
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[windowMin,minindex]=min(Mj4(windowBegin:windowEnd));
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if minindex < maxindex &&((maxindex-minindex)<windowSizeQ)&&windowMax>0.1&&windowMin<-0.1
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flag=1;
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mark5=round((maxindex+minindex)/2+windowBegin);
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countTMj4(mark5)=1;
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countT(mark5-20)=1;%找到T 波峰值点
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%%%%%确定T 波起始点和终点
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countTbegin(windowBegin+minindex-20)=-1;
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countTend(windowBegin+maxindex-20)=-1;
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end
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if flag==1
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break;
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end
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end
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if mark5==0 %假设没有T 波。在R 波右 间隔1/3 处赋值-2
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mark5=round(Rlocated(i)+ RRinteral/3);
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countT(mark5)=-2;
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end
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end
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%plot(countTMj4,'g');
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%hold off;
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figure(4);
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plot(ecg_i(0*points+1:1*points)),grid on,axis tight,axis([1,points,-2,5]);
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title('ECG 信号的各波波段检测');
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hold on
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plot(countR,'r');
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plot(countQ,'k');
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plot(countS,'k');
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for i=1:Rnum
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if R_result(i)==0;
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break
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end
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plot(R_result(i),ecg_i(R_result(i)),'bo','MarkerSize',10,'MarkerEdgeColor','g');
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end
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plot(countP,'r');
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plot(countT,'r');
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plot(countPbegin,'k');
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plot(countPend,'k');
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plot(countTbegin,'k');
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plot(countTend,'k');
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hold off |