Identify lines in spectrogram using python

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I have a long strip of data with some lines in it that are visually very clear (both blue and red), however, I can't seem to be able to identify them versus the background.

I've tried to average the array in in the time direction, run that through a low pass filter and then identify the peaks. But it does not seem to work. Therefore, I was wondering if perhaps the image itself can be used to look for the locations, using say openCV or such? enter image description here

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