Digitising scope trace pictures.

Mar 20, 2018 6 Replies
C

I have some screenshots of scope traces which I'd like to digitise so I can play them through a waveform generator. CSV files would be good.



It's only one trace I want to digitise from each picture, identified by its colour. These are, unfortunately, jpg images, so the trace edges are 'blurred' a bit and the traces are quite thick, plus there's a dotted black grid. Ideally, I want something which can digitise based on the notional centre of a particular coloured trace.



I can fiddle with Gimp to remove the other traces, but what can I use to digitise? I've tried GraphGrabber, but there must be something better.



Any ideas?



Cheers


Clive
Vote
Twitter Facebook LinkedIn
W

ImageJ/Fiji

formatting link

It's under Analize>Tools>Analyze Line Graph.

You'll need to modify the image first by converting it to black and white and then thresholds. You may also need to use other image stuff like sharpen or smooth.

Vote
Twitter Facebook LinkedIn
S

Ifranview: image: effects: edge detection

might cleanup your picture.

Vote
Twitter Facebook LinkedIn
C

Thanks for all the suggestions.

Eventually, I found

formatting link
which did everything I wanted, and for free! (This wasn't until I'd resorted to printing waveforms, cutting them out, sticking them to the monitor and digitising by shaky hand.)

Cheers

Clive
Vote
Twitter Facebook LinkedIn
T

Oh, well if that's the level you need! This should do as well:

formatting link

Tim

Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/
Vote
Twitter Facebook LinkedIn
C

Thanks, tried that. Doesn't do equal-step x (time) axis.

Cheers

Clive
Vote
Twitter Facebook LinkedIn
T

Y'mean equally spaced X points? You can select that in the auto-convert panel.

Tim

Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required