Theorical Question About Making Matlab Read Graphic

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Let's say we have a graphic which consinst of x axis and y axis, but the shown lines in graphic are gathered from many experimental data's and we can't reach to those informations. So we are left with only graphic. To make situation worse we just have pdf version of the graphic.
In this case, how can we make a program which will read values from this graphic?
The question might be awkward. Im die-hard newbie in programming. I just wanted to ask and see what you guys would think about this.

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Star Strider
Star Strider 2019-11-9
Click on this link to launch a File Exchange search for functions that scan and import data from a printed plot. One popular file appears to be GRABIT.
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Walter Roberson
Walter Roberson 2019-11-9
Note: a while back I went through and tagged all of the File Exchange submissions on this topic, all with the tag "digitize". So you can find a variety of similar programs by searching on https://www.mathworks.com/matlabcentral/fileexchange/?term=tag:%22digitize%22

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