Detecting patterns in waves

Question

I\'m trying to read a image from a electrocardiography and detect each one of the main waves in it (P wave, QRS complex and T wave). Now I can read the image and get a vector li

Answer 1

Wavelets have been shown to be the best tool for locating peaks in this type of data where the peaks are "different sizes" - the scaling properties of wavelets make it an ideal tool for this type of multi-scale peak detection. This looks like a non-stationary signal so using a DFT would not be the right tool as some have suggested, but if this is an exploratory project you could look at using the spectrum of the signal (estimated using essentially the FFT of the autocorrelation of the signal.)

Here is a great paper reviewing several peak detection methods - this would be a good place to start.

-Paul