Hey @igorsha Welcome to the forums.
What exactly is the question? Convert the curves on paper to an array or list?
yes, is it possible? so I can use full Plotly functionality, and not putting image as background
This can be done, but you might be better of searching for help in a different forum. The plotting of the digital data with plotly is the easiest part.
https://www.google.com/search?q=ecg%20San%20from%20paper&ie=utf-8&oe=utf-8
agree, but maybe some one already did it
Have you looked at the paper at the first link below, and the open source code by its authors at the second?
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Thank - will try