How to detect peaks above a certain threshold in matlab

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pavan sunder
pavan sunder 2016-11-20
评论： Ewunate Assaye Kassaw 2021-11-17
How to detect peaks above a threshold in a signal and store their locations.
I wrote a code:
[Pks,locs]=findpeaks(x,1000,'Threshold',5);
But i didnt get any result..is there any other way?..kindly help me with matlab code.

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回答（3 个）

Image Analyst
Image Analyst 2016-11-20
If MinPeakHeight doesn't work, then you can always threshold your original signal to set values below the threshold to the min.
minValue = min(yourSignal);
yourSignal(yourSignal < threshold) = minValue;
then call findpeaks.
Walter Roberson
Walter Roberson 2016-11-20
  1 个评论
Image Analyst
Image Analyst 2016-11-20
Does MinPeakHeight filter based on the peak height above the peak base, or based on absolute signal values? The documentation is not clear to me. It says "Minimum peak height, specified as the comma-separated pair consisting of 'MinPeakHeight' and a real scalar. Use this argument to have findpeaks return only those peaks higher than 'MinPeakHeight'." But it's not clear that "higher" means to them.

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sohab azhar
sohab azhar 2019-8-11
i have converted a colour video into histogram now i have to get the number of highest peaks in histogram how can i do it?
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sohab azhar
sohab azhar 2019-8-24
yes i have used findpeaks() but it is not working , actually i want to apply threshold and get number of peaks above that threshold.
Image Analyst
Image Analyst 2019-8-25
You either do not have the Signal Processing Toolbox installed, or you're not applying the best set of input parameters to findpeaks(). That's about all we can say since you have not shared your signal, your code, or your error message. "It is not working" is, as I'm sure you can imagine, about as useless and unhelpful description of the problem that is possible. What are we supposed to do with that? I guess, just refer you to this link

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