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Ecg Extraction Code

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Contents

n ZERO CROSSING REMOVAL n DETECT R_PEAK

n Calculate R in the actual Signal

n After R Peak Tracking ... DETCET OTHERS n ONSET n P Peak n Q Detection n S Detection n T Peak n END OF T

% Load original 1D signal. clc; clear all; close all; ELEVATED=[]; [fname path]=uigetfile('*.mat'); fname=strcat(path,fname); load(fname ); z=zeros(100,1); A=val(1,:); v1=val(1,:)-val(1,1); A=v1; A=A'; zc=A(1); A=[z;A;z];

% Plot Actual Signal s = A(1:1:400); s = A;

ls = length(s); figure(1) plot(s);

title('Original Signal'),grid on

% Perform decomposition at level 8 of s using db4 [c,l]=wavedec(s,8,'db4'); ca1=appcoef(c,l,'db4',1); ca2=appcoef(c,l,'db4',2); ca3=appcoef(c,l,'db4',3); ca4=appcoef(c,l,'db4',4); ca5=appcoef(c,l,'db4',5); ca6=appcoef(c,l,'db4',6); ca7=appcoef(c,l,'db4',7); ca8=appcoef(c,l,'db4',8);

%Plot the coefficient figure(2)

plot(c),title('decomposed signal'),grid on figure(3)

subplot(4,2,1)

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plot(ca1),title('1st level approximation'),grid on subplot(4,2,2)

plot(ca2),title('2nd level approximation'),grid on subplot(4,2,3)

plot(ca3),title('3rd level approximation'),grid on subplot(4,2,4)

plot(ca4),title('4th level approximation'),grid on subplot(4,2,5)

plot(ca5),title('5th level approximation'),grid on subplot(4,2,6)

plot(ca6),title('6th level approximation'),grid on subplot(4,2,7)

plot(ca7),title('7th level approximation'),grid on subplot(4,2,8)

plot(ca8),title('8th level approximation'),grid on

% Extract detail coefficients at levels % 1, 2 and 3, from wavelet decomposition % structure [c,l].

[cd1,cd2,cd3,cd4,cd5,cd6,cd7,cd8] = detcoef(c,l,[1 2 3 4 5 6 7 8]);

figure(4)

subplot(4,2,1)

plot(cd1),title('detail coeff: level 1 cd1'),grid on subplot(4,2,2)

plot(cd2),title('detail coeff: level 2 cd2'),grid on subplot(4,2,3)

plot(cd3),title('detail coeff: level 3 cd3'),grid on subplot(4,2,4)

plot(cd4),title('detail coeff: level 4 cd4'),grid on

subplot(4,2,5)

plot(cd5),title('detail coeff: level 5 cd5'),grid on subplot(4,2,6)

plot(cd6),title('detail coeff: level 6 cd6'),grid on subplot(4,2,7)

plot(cd7),title('detail coeff: level 7 cd7'),grid on subplot(4,2,8)

plot(cd8),title('detail coeff: level 8 cd8'),grid on

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ZERO CROSSING REMOVAL

base_corrected=ca2; y=base_corrected-zc; figure(5)

plot(y),grid on

title('Noise Free signal')

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DETECT R_PEAK

y1=y;

m1=max(y1)-max(y1)*.60; P=find(y1>=m1);

% it will give two two points ... remove one point each P1=P; P2=[]; last=P1(1); P2=[P2 last]; for(i=2:1:length(P1)) if(P1(i)>(last+10)) last=P1(i); P2=[P2 last]; end end Rt=y1(P2); figure(6) plot(y1),grid on,hold on plot(P2,Rt,'*');

title('Rpos in downsampled signal');

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C

te R n t e

t

S n

P3=P2*4; Rpos=[]; for( i=1:1:length(P3)) range= [P3(i)-20:P3(i)+20]; m=max(A(range)); l=find(A(range)==m); pos=range(l); Rpos=[Rpos pos]; end Ramp=A(Rpos); figure(7) plot(A),grid on,hold on plot(Rpos,Ramp,'*');

title('Detected R peak in actual Signal'); R_peaks = length(Rpos)

%disp([num2str(R_peaks) ' peaks'])

R_peaks =

13

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A ter R Pe

Tr

n DETCET OT ERS

ONSET

X=Rpos; y1=A; for(i=1:1:1) for(j=1:1:length(X)) a=X(j)-100:X(j)-50; m=max(y1(a)); b=find(y1(a)==m); b=b(1); b=a(b); fnd=0; for k=b-20:+1:b

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b-20:+1:b; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end

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P Pe

Dete t on

RON(i,j)=qon1(1); fnd;

for k=b:+1:b+20

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b:+1:b+20; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end ROF(i,j)=qon1(1); a=Rpos(i,j)-100:Rpos(i,j)-10; m=max(y1(a)); b=find(y1(a)==m); b=b(1); b=a(b); Ppos(i,j)=b; Pamp(i,j)=m; end a=Rpos(i,j)-50:Rpos(i,j)-10; m=min(y1(a)); b=find(y1(a)==m); b=b(1); b=a(b); Qpos(i,j)=b; Qamp(i,j)=m; %%%%% ONSET fnd=0; for k=b-20:+1:b

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b-20:+1:b; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end QON(i,j)=qon1(1); fnd; for k=b:+1:b+20

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k;

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S Dete t on

T Pe

fnd=1; break end end if(fnd==0) Qrange=b:+1:b+20; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end QOF(i,j)=qon1(1); a=Rpos(i,j)+5:Rpos(i,j)+50; m=min(y1(a)); b=find(y1(a)==m); b=b(1); b=a(b); Spos(i,j)=b; Samp(i,j)=m; %%%% onset off fnd=0; for k=b-5:+1:b

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b-20:+1:b; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end SON(i,j)=qon1(1); fnd=0; for k=b:+1:b+20

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b:+1:b+20; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end SOFF(i,j)=qon1(1); a=Rpos(i,j)+25:Rpos(i,j)+100; m=max(y1(a)); b=find(y1(a)==m); b=b(1); b=a(b);

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END O T

Tpos(i,j)=b; Tamp(i,j)=m; %%%% onset off fnd=0; for k=b-20:+1:b

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b-20:+1:b; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end TON(j,i)=qon1(1); fnd=0; for k=b:+1:b+20

if((y1(k)<=0) && (y1(k-1)>0)) qon1=k; fnd=1; break end end if(fnd==0) Qrange=b:+1:b+20; qon1=find(y1(Qrange)==max(y1(Qrange))); qon1=Qrange(qon1); end TOFF(j,i)=qon1(1); if(Tamp(i,j)<Pamp(i,j)) a=Rpos(i,j)+25:Rpos(i,j)+70; m=min(y1(a)); b=find(y1(a)==m); b=b(1); b=a(b); Tpos(i,j)=b; Tamp(i,j)=m; ELEVATED=[ELEVATED j]; end end figure; k=1; for(i=1:1:1) %subplot(6,1,k);

plot(y1), hold on;

plot(Rpos(i,:),Ramp(i,:),'*'),hold on; plot(Qpos(i,:),Qamp(i,:),'+'),hold on; plot(Spos(i,:),Samp(i,:),'+'),hold on; plot(Ppos(i,:),Pamp(i,:),'.'), hold on plot(Tpos(i,:),Tamp(i,:),'^')

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legend('Ramp','Qamp','Samp','Pamp','Tamp') grid on; k=k+1; if(k>6) k=1; figure; end end % Detected no of peaks R_peaks = length(Rpos) P_peaks = length(Ppos) T_peaks = length(Tpos) S_peaks = length(Spos) Q_peaks = length(Qpos) clc; flag=0; if(length(ELEVATED)>ceil(.8*length(Rpos)))

disp('T inverted (MI Detected) with T inverted Logic')

return; else flag=1; end R_peaks = length(Rpos) P_peaks = length(Ppos) T_peaks = length(Tpos) S_peaks = length(Spos) Q_peaks = length(Qpos) R_peaks = 13 P_peaks = 13 T_peaks = 13 S_peaks = 13 Q_peaks = 13 R_peaks = 13

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Published with MATLAB® 7.14 P_peaks = 13 T_peaks = 13 S_peaks = 13 Q_peaks = 13

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