Being a fomer printer with 15 years of experience in offset and digital printing, I actually have known about scanners that can do this for some time. The software that was being used in this video looks outstanding, don't know anything about it.
Scanning as fast as it was, the computer, I would assume, would be capable of handling the processing of so many images so quickly, without any hiccups. Obviously, in the video, it was working without a hitch.
The scanner itself would present a few potential issues, at least to me.
1. The feed is most likely using pinch rollers. Pinch rollers are made of rubber and would need to be calibrated to the card thickness, fairly accurately, or the rollers would either indent the cards, damaging them, or/also giving the rollers unnecessary wear, which would lead to issue 2.
2. Potential damage to the card. A simple misfeed can obviously damage a card: bend, indent, cut, tear.
3. Autographed cards. Referencing the pinch rollers again, there is a potential with rubber rollers to drag across an autograph, smudge, or even offset the ink used as the roller moves.
4. Patch type cards. With cut-outs inside the card, the rollers would be jumping, leading again to the potential roller issues.
Now, logically speaking, and simply enough, you could just a flatbed scanner for specialty cards like autograpsh or patch cards.
With all that being said, and even knowing the potential risks to cards (overall a small percentage chance of damage if everything is working just fine), I would love to be able to do this with the bulk of my collection.
One of the things I really enjoy about scanning how I do, is handling each individual card and getting one that will pause my scanning as I have a memory on why I still enjoy collecting cards, and why I am so reinvigorated and enjoying it even more since I found this site and the wonderful people I have communicated with here so far.
Grandpa's scanning setup is a solid 9.5 out of 10, just by the short video itself.
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