MATLAB: How to calculate rise time fall time for this graph in generalized manner

MATLABparametric analysis of data

I need to calculate rise time and fall time of the multiple pulses in the graph in automated way. the only toolbox i have is image processing and the basic tools.
So, i cannot use directly the rise time and fall time commands(as they are contained in signal processing toolbox).
Is there any way, hint for solving this problem.

Best Answer

I want to show you how succesfull i am
please see attached script
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