Digitizer Program which gives X,Y Coordinates of Lines or Points on Scanned Images

We want to extract the X,Y coordinates manually from imported figure (image).

Figures contain clear or non clear points or lines.

Rapid research in Google gives:

Graphmatica, Export figures and not import

Graph digitizer: ?

Engauge digitizer: I think it works only for distinct points and non merged points or lines?

UnGraph: ?

Plot Digitizer?

Thank you for your advice in this subject, we wait your experience.

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