How to find the proper peaks in a graph?

So, I need to find peaks but I haven't found a good 'algorithm' or method to find them, for instance I have the following graph, so you can see that Peak 1 is not covered and I probably don't want peak 2 and 3 is not part of the peaks.

I'm using findpeaks with MinPeakDistance of 150 for this example.

If I use Threshold, for some reason is not working as expected and I need to input a very small number to see something happening, and that number is .001, and that is giving me almost half the peaks which I don't want to.

I know this question is not clear and reason why is because I don't really know how to calculate the peaks that I want.

Hope it makes sense and someone can illuminate me.

[Prashant Arora]

Hi David,

Check out the prominence property of the peaks and the "MinPeakProminence" option in the findpeaks function.

Prominence

MinPeakProminence