You're not wrong, but it's also not the focus of the article. There's a lot of complexity in a pick and place system, for example I didn't even touch on the entirely separate board that's controlling the tool head. If I tried to capture all that at once, I'd be writing an entire textbook, not an article.
If you're interested in how the LumenPnP handles vision, you can check out the OpenPNP project which handles all of the computer vision involved.
If you're interested in how the LumenPnP handles vision, you can check out the OpenPNP project which handles all of the computer vision involved.
https://openpnp.org/