4 ms·

Face as a QR Code

43 points by surprisetalk 10mo ago

wernsey 10mo ago
The blog just leads to https://research.swtch.com/qr/draw/ https://research.swtch.com/qr/draw/, which is the demo page of the blogs [1] and [2] written by Russ Cox many years ago about putting pictures in QR codes by manipulating the error correction codes in them [1]: https://research.swtch.com/qart https://research.swtch.com/qart [2] https://research.swtch.com/field https://research.swtch.com/field
- madethemcry 10mo ago
  Hey thanks a lot, that should be the actual link behind the submission. Very interesting technique that boils down to encode a url with a ton of carefully shaped random numbers hidden in the fragment to generate the actual art. That's the example url from the linked blog introducing this technique http://swtch.com/pjw/#123456789 http://swtch.com/pjw/#123456789... Source Code (Go) is here: https://github.com/rsc/qr/tree/master/qart https://github.com/rsc/qr/tree/master/qart
- extraduder_ire 10mo ago
  Messing with that demo page, it seems to manipulate the URL you put in there too adding some numbers after an anchor tag (#) at the end, rather than just error correction.
  - VladVladikoff 10mo ago
    Interesting I was wondering about this, if you control the domain and web server technically you could even make a full path of arbitrary data that then redirects to the real target.
isoprophlex 10mo ago
Does this mean you could make a gif which is a valid QR code playing Bad Apple?
- TOMDM 10mo ago
  A series of QR codes that each link to the next frame of bad apple is the logical conclusion to me
- hcaz 10mo ago
  Yes: https://www.reddit.com/r/touhou/comments/ueo304/i_played_bad_apple_in_a_qr_code_that_links_to_the/ https://www.reddit.com/r/touhou/comments/ueo304/i_played_bad... https://news.ycombinator.com/item?id=40377122 https://news.ycombinator.com/item?id=40377122
nusl 10mo ago
Made me wonder how easy it is to embed QR codes inside everyday images/objects without them being visible until you scan the object.

43 points by surprisetalk 10mo ago

The blog just leads to https://research.swtch.com/qr/draw/ https://research.swtch.com/qr/draw/, which is the demo page of the blogs [1] and [2] written by Russ Cox many years ago about putting pictures in QR codes by manipulating the error correction codes in them [1]: https://research.swtch.com/qart https://research.swtch.com/qart [2] https://research.swtch.com/field https://research.swtch.com/field

madethemcry 10mo ago
Hey thanks a lot, that should be the actual link behind the submission. Very interesting technique that boils down to encode a url with a ton of carefully shaped random numbers hidden in the fragment to generate the actual art. That's the example url from the linked blog introducing this technique http://swtch.com/pjw/#123456789 http://swtch.com/pjw/#123456789... Source Code (Go) is here: https://github.com/rsc/qr/tree/master/qart https://github.com/rsc/qr/tree/master/qart
extraduder_ire 10mo ago
Messing with that demo page, it seems to manipulate the URL you put in there too adding some numbers after an anchor tag (#) at the end, rather than just error correction.
- VladVladikoff 10mo ago
  Interesting I was wondering about this, if you control the domain and web server technically you could even make a full path of arbitrary data that then redirects to the real target.

isoprophlex 10mo ago

Does this mean you could make a gif which is a valid QR code playing Bad Apple?

TOMDM 10mo ago
A series of QR codes that each link to the next frame of bad apple is the logical conclusion to me
hcaz 10mo ago
Yes: https://www.reddit.com/r/touhou/comments/ueo304/i_played_bad_apple_in_a_qr_code_that_links_to_the/ https://www.reddit.com/r/touhou/comments/ueo304/i_played_bad... https://news.ycombinator.com/item?id=40377122 https://news.ycombinator.com/item?id=40377122

nusl 10mo ago

Made me wonder how easy it is to embed QR codes inside everyday images/objects without them being visible until you scan the object.