Reader jsults turned my on to g3data… it’s a little open source program that helps extract data from graphs.
It looks like this in action:
I tried it with my oscilloscope photographs and it worked OK. But it does not compensate for trapezoidal distortions.
If my camera were perfectly lined up with the oscilloscope g3data would work great.
This got me to thinking… maybe I could build a camera holder for the oscilloscope?
So I did.
Works like a charm. Now all my oscilloscope photos will be perfectly centered and flat: