Computer Aided Die Study

1630Boston

Computer Aided Die Study
This is a long video, I haven't finished it but it seems interesting.

https://youtu.be/wF6aZdhc0wg

yosclimber

Thanks! I watched the whole thing.

http://numismatics.org/pocketchange/cads/ (previous version - Witschonke and Su, 2017)

http://digitalhn.blogspot.com/2020/08/notes-on-new-developments-in-computer.html review of the methods shown in this video, by Ed Snible

https://ztaylor54.com/ Zachary Taylor

https://docs.opencv.org/3.4/d1/d89/tutorial_py_orb.html ORB feature detection

I have used OpenCV with Python for some simple tasks, like cropping Heritage auction photos.

ɹoʇɔǝlloɔ

this is fascinating- I wonder if Zachary is on the forums

1630Boston

Thanks for the links @yosclimber
I'm still working on the video

ricko

Long video... will have to bookmark that one. Thanks for posting it, looks interesting. Cheers, RickO

yosclimber

I was impressed at how well the generic "ORB" feature detection worked
to classify / group the coins from the same dies together.

It appears that no special programming was needed.
Just use a circular crop to ignore the irregular edges, a blur to smooth over circulation wear,
and call the ORB "feature" detection function.
Then call a second function to measure distances between features on a pair of coins to make a "similarity score".
Then group the coins with low similarity scores together.

I would say there was a bit too much jargon in the presentation, but that happens sometimes when
you are mixing people from two different fields.

Kurisu

@1630Boston said:
Computer Aided Die Study
This is a long video, I haven't finished it but it seems interesting.

Thanks for posting that!

LanceNewmanOCC

any crumbs to share from the vid? ill be d/l it now.

LanceNewmanOCC

it was interesting and will do a great service to numismatics, especially for the super old stuff. once refined more and more, will be useful for more modern stuff than ancients. if you like slow drawn-out explanations of technical processes and numismatics, this will be right up your alley. a good presentation.

oih82w8

Tagged for viewing later, when I get some decent bandwidth.