2 HN users recommended this talk2 months2020–2026score 2
Years with an HN recommendation, 2007–2026
The standard reference whenever HN discusses the Xerox scanner bug or AI and compression that fabricates content.
David Kriesel's FrOSCon talk on how Xerox scancopiers, due to JBIG2 compression, silently replaced digits in scanned documents. He walks through how he discovered the bug and why it is so dangerous.
“There a few videos of David Kriesel explaining the bug for the curious” (HN, 2020)
> You may remember that this played a strange role in Obama's birth certificate some years back Just to clarify, the issue with the compression algorithm used by the scanner, not with the PDF format itself. There a few videos of David Kriesel explaining the bug for the curious: [this video]
Explains the Xerox scanner compression bug that altered digits in scans.
Even though this happened a long time ago, whenever I hear or think about it, I am a mazed that it didn't put Xerox out of business, or at least hurt a little more. After all, some big players were already doing digital archiving at the time. :-/ BTW, the CCC had a pretty neat presentation at that time as well: [this video]
A neat CCC presentation about the Xerox document-altering scanner bug.
Sounds like the next iteration of "Lies, damned lies and scans": [this video] >On the scale of things too horrible to contemplate, "document-altering scanner" is right up there with "flesh-eating bacteria". Since 2006, Xerox scancopiers literally are making stuff up. They, for example, replace digits with others in scans.
Describes Xerox scanners silently replacing digits in scanned documents.
> OCR for construction documents does not work I'm reminded of the Xerox JBIG2 bug back in ~2013, where certain scan settings could silently replace numbers inside documents, and bad construction-plans were one of the cases that led to it being discovered. [0] It wasn't overt OCR per se , users weren't trying to convert pixels to characters. [0] [this video]
Covers the JBIG2 scanner bug that silently replaced numbers in documents.
Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.
Plays via YouTube's privacy-enhanced embed
5 Hacker News comments
From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.
Citations, criticism and jokes