How to detect peaks above a given threshold value?
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findpeaks() can detect multiple peaks if there is/are change in direction(s) even if the values are above the specified threshold (see arrows in the attached pdf file).
Rashedur Rahman on 20 Jul 2020
The function 'findpeaks' can take several input arguments for finding peaks according to criteria. You can use multiple arguments to adjust your peak finding algorithm. I will suggest you to read the description of 'findpeaks'. ('https://www.mathworks.com/help/signal/ref/findpeaks.html').
Another way is to apply a filter to smoothen the signal and then apply 'findpeaks'.
More Answers (1)
Image Analyst on 20 Jul 2020
Edited: Image Analyst on 20 Jul 2020
Try flattening the signal by subtracting that red trend line. Then set the values of the signal below the threshold to zero and then call findpeaks()
smoothedSignal = movmean(signal, 101);
flattenedSignal = signal - smoothedSignal;
flattenedSignal(flattenedSignal < someThreshold) = 0;
[peakValues, indexesOfPeaks] = findpeaks(flattenedSignal);
Attach your data in a .mat file if you need more help.