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How to recognize line charts

First of all I am beginner on this field and hoping to get help from you.

I would like to recognize line chart and get (x,y) values from chart into excel. Charts could look like this. image description

or like this

image description

Charts are in cartesian coordinate. I have checked this. But couldnt understand all the logic fully and feels like it's little outdated. Could you please describe the steps, papers, algorithms and/or specific modules from OpenCV which I should read in order to accomplish my task. Please let me know if I should add specific details.