I need to get this kind of information into numbers, how?

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Perhaps related

  1. https://dsp.stackexchange.com/questions/1054/how-do-i-recover-the-signal-from-an-ecg-image

  2. https://dsp.stackexchange.com/questions/1080/find-a-specific-line-in-a-picture

  3. R's biOps here as a generic tool. R's PET has Hough transform here (but may not work in this domain but HT does not seem too complicated, here)


There's the Haskell explore package meant to do that:

Very first prototype of a command line tool to extract pixel positions matching a given colour to help reconstruct plot data.

(Also see its homepage. I've never used this, though.)

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