Convert an XY graph to either an spreadsheet or database table.
In the attached example, the left graph shows several diagonal temperature lines with on the vertical axis N1 and the horizontal axis flex takeoff N1.
So for a given diagonal line (example 0°) create a table with the values of the horizontal axis in function of the vertical or vice-versa.
The scales of each axis will have to be set by selecting the relevant minimum and maximum values of the relevant axis. Then the desired graph (1 of the diagonal lines) needs to be selected and the program must track the diagonal line automatically until it reaches the end of the line while extracting the X-Y values into a table.
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Unfortunately, this is not a simple solution. If you have all your data in image form, then we are talking about image processing, which is a complex subject. Please check your PM for my proposed solution.
I am a Senior Software developer with over 10 years experience. I recently did a graphing program in C# for linear algebra so I know I can provide a quality solution for you. Please see your PM for more details.