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PPGextract.m
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PPGextract.m
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%% Example Title
xx = nn;
AddF=zeros(200,1);
AddE=zeros(300,1);
x=[AddF', xx',AddE'];
B=1000*ones(1,100);
PE=x-open_operation(x,B,length(x),50);
VE=x-closed_operation(x,B,length(x),50);
PVE=PE+VE;
PE=PVE-open_operation(PVE,B,length(PVE),50);
VE=PVE-closed_operation(PVE,B,length(PVE),50);
PVE=PE+VE;
PE=PVE-open_operation(PVE,B,length(PVE),50);
points=length(x);
swa=zeros(4,points); %存储概貌信息
swd=zeros(4,points); %存储细节信息
%计算小波系数和尺度系数
%低通滤波器 1/4 3/4 3/4 1/4
%高通滤波器 -1/4 -3/4 3/4 1/4
%二进样条小波
signal=x;
level=4;
for i=1:points-3
swa(1,i+3)=1/4*signal(i+3-2^0*0)+3/4*signal(i+3-2^0*1)+3/4*signal(i+3-2^0*2)+1/4*signal(i+3-2^0*3);
swd(1,i+3)=-1/4*signal(i+3-2^0*0)-3/4*signal(i+3-2^0*1)+3/4*signal(i+3-2^0*2)+1/4*signal(i+3-2^0*3);
end
j=2;
while j<=level
for i=1:points-24
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);
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);
end
j=j+1;
end
%**************************************求正负极大值对**********************%
ddw=zeros(size(swd));
pddw=ddw;
nddw=ddw;
%小波系数的大于0的点
posw=swd.*(swd>0);
%斜率大于0
pdw=((posw(:,1:points-1)-posw(:,2:points))<0);
%正极大值点
pddw(:,2:points-1)=((pdw(:,1:points-2)-pdw(:,2:points-1))>0);
%小波系数小于0的点
negw=swd.*(swd<0);
ndw=((negw(:,1:points-1)-negw(:,2:points))>0);
%负极大值点
nddw(:,2:points-1)=((ndw(:,1:points-2)-ndw(:,2:points-1))>0);
%或运算
ddw=pddw|nddw;
ddw(:,1)=1;
ddw(:,points)=1;
%求出极值点的值,其他点置0
wpeak=ddw.*swd;
wpeak(:,1)=wpeak(:,1)+1e-10;
wpeak(:,points)=wpeak(:,points)+1e-10;
interva2=zeros(1,points);
intervaqs=zeros(1,points);
Mj1=wpeak(1,:);
Mj3=wpeak(3,:);
Mj4=wpeak(4,:);
posi=Mj3.*(Mj3>0);
%求正极大值的平均
thposi=min([max(posi(1:floor(points/4))),max(posi(floor(points/4):2*floor(points/4))),max(posi(2*floor(points/4):3*floor(points/4))),max(posi(3*floor(points/4):4*floor(points/4)))]);
posi=(posi>thposi/3);
nega=Mj3.*(Mj3<0);
%求负极大值的平均
thnega=max([min(nega(1:floor(points/4))),min(nega(floor(points/4):2*floor(points/4))),min(nega(2*floor(points/4):3*floor(points/4))),min(nega(3*floor(points/4):4*floor(points/4)))]);
nega=-1*(nega<thnega/4);
%找出非0点
interva=posi+nega;
loca=find(interva);
for i=1:length(loca)-1
if abs(loca(i)-loca(i+1))<80
Diff(i)=interva(loca(i))-interva(loca(i+1));
else
Diff(i)=0;
end
end
%找出极值对
%正向R波检测
loca2=find(Diff==-2);
%负极大值点
interva2(loca(loca2(1:length(loca2))))=interva(loca(loca2(1:length(loca2))));
%正极大值点
interva2(loca(loca2(1:length(loca2))+1))=interva(loca(loca2(1:length(loca2))+1));
intervaqs(1:points-10)=interva2(11:points);
countR=zeros(1,1);
mark1=0;
mark2=0;
mark3=0;
i=1;
j=1;
Rnum=0;
%*************************求正负极值对过零，即R波峰值，并检测出QRS波起点及终点*******************%
while i<points
if interva2(i)==-1
mark1=i;
i=i+1;
while(i<points&&interva2(i)==0)
i=i+1;
end
mark2=i;
%求极大值对的过零点
mark3= floor((abs(Mj3(mark2))*mark1+mark2*abs(Mj3(mark1)))/(abs(Mj3(mark2))+abs(Mj3(mark1))));
%R波极大值点
R_result(j)=mark1-5;%经验值
countR(mark1-5)=1;
end
i=i+1;
end
%************************删除多检点，补偿漏检点**************************%
num2=1;
while(num2~=0)
num2=0;
%j=3,过零点
R=find(countR);
%过零点间隔
R_R=R(2:length(R))-R(1:length(R)-1);
RRmean=mean(R_R);
%当两个R波间隔小于0.4RRmean时,去掉值小的R波
for i=2:length(R)
if (R(i)-R(i-1))<=0.4*RRmean
num2=num2+1;
if signal(R(i))>signal(R(i-1))
countR(R(i-1))=0;
else
countR(R(i))=0;
end
end
end
end
num1=2;
while(num1>0)
num1=num1-1;
R=find(countR);
R_R=R(2:length(R))-R(1:length(R)-1);
RRmean=mean(R_R);
%当发现R波间隔大于1.6RRmean时,减小阈值,在这一段检测R波
for i=2:length(R)
if (R(i)-R(i-1))>1.6*RRmean
Mjadjust=Mj3(R(i-1)+80:R(i)-80);
points2=(R(i)-80)-(R(i-1)+80)+1;
%求正极大值点
adjustposi=Mjadjust.*(Mjadjust>0);
adjustposi=(adjustposi>thposi/4);
%求负极大值点
adjustnega=Mjadjust.*(Mjadjust<0);
adjustnega=-1*(adjustnega<thnega/5);
%或运算
interva4=adjustposi+adjustnega;
%找出非0点
loca3=find(interva4);
diff2=interva4(loca3(1:length(loca3)-1))-interva4(loca3(2:length(loca3)));
%如果有极大值对,找出极大值对
%负向捡漏
loca4=find(diff2==2);
interva3=zeros(points2,1)';
for j=1:length(loca4)
interva3(loca3(loca4(j)))=interva4(loca3(loca4(j)));
interva3(loca3(loca4(j)+1))=interva4(loca3(loca4(j)+1));
end
mark4=0;
mark5=0;
while j<points2
if interva3(j)==1;
mark4=j;
j=j+1;
while(j<points2&&interva3(j)==0)
j=j+1;
end
mark5=j;
countR(R(i-1)+80+mark4-5)=1;
j=j+60;
end
j=j+1;
end
%正向捡漏
loca5=find(diff2==-2);
interva5=zeros(points2,1)';
for j=1:length(loca5)
interva5(loca3(loca5(j)))=interva4(loca3(loca5(j)));
interva5(loca3(loca5(j)+1))=interva4(loca3(loca5(j)+1));
end
mark7=0;
while j<points2
if interva5(j)==-1;
mark7=j;
j=j+1;
while(j<points2&&interva5(j)==0)
j=j+1;
end
countR(R(i-1)+80+mark7-5)=1;
j=j+60;
end
j=j+1;
end
end
end
end
num2=1;
while(num2~=0)
num2=0;
%j=3,过零点
R=find(countR);
%过零点间隔
R_R=R(2:length(R))-R(1:length(R)-1);
RRmean=mean(R_R);
%当两个R波间隔小于0.4RRmean时,去掉值小的R波
for i=2:length(R)
if (R(i)-R(i-1))<=0.4*RRmean
num2=num2+1;
if signal(R(i))>signal(R(i-1))
countR(R(i-1))=0;
else
countR(R(i))=0;
end
end
end
end
cc=find(countR);
Rpeak(1)=cc(1);
for i=2:length(cc)
temp=cc(i)-31+find(x(cc(i)-31:cc(i)+17)==max(x(cc(i)-31:cc(i)+17)))-1;
Rpeak(i)=min(temp);
end