finding accurate number of peaks and eleminate unwanted peaks
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HI
I'm trying to find peaks in this data :
the actual data has 10 peaks as shown in the image below (peaks are in rectangle)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/161929/image.jpeg)
. I applied sgf filter got the peaks below
order = 7;
framelen =15;
x=data;
lx = 34;
sgf = sgolayfilt(x,order,framelen);
plot(x);
hold on;
plot(sgf);
sgf=-sgf;
[pks_smoothed,locs_smoothed,widths_smoothed,proms_smoothed] = findpeaks(sgf,'MinPeakProminence',0.05);
pks_smoothed = -pks_smoothed;
plot(locs_smoothed,pks_smoothed,'g*');
text(locs_smoothed+.02,pks_smoothed,num2str((1:numel(pks_smoothed))'))
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/161930/image.jpeg)
it detects many unwanted peaks how can I find the required peaks accurately and get rid of unwanted peaks ?
1 Comment
Answers (1)
Greg Dionne
on 20 Mar 2017
Try:
findpeaks(sgf,'MinPeakProminence',1.2);
3 Comments
Greg Dionne
on 22 Mar 2017
Edited: Greg Dionne
on 22 Mar 2017
An alternative is to perhaps take the output of your widths_smoothed and prom_smoothed and come up with some heuristic that matches the most of the peaks you care about then filter out the rest based upon that somehow. Some of your peaks look kind of "flat". Maybe use a combination of medfilt1() and diff() to identify the edges.
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