How to make a QR code with Stable Diffusion

Post by cafxx » Mon, Jun 12, 2023, 9:32 AM UTC

tln wrote: post #25

cafxx wrote: post #7

The funny thing is that no-one AFAICT has realized that the same content can be encoded in different-looking QR codes. Beside the obvious (different error-correction levels), the content itself can be changed while maintaining its semantic meaning (e.g. " https://example.com/foo ", "HTTPS://EXAMPLE.COM/foo", or "HtTpS://eXaMpLe.CoM/foo" are all semantically identical) and even the QR encoding itself can be tweaked (e…

QR codes have several different bit-pattern masks, which an encoder should choose between to avoid blocks or runs.. so even without altering the URL there are different outputs. [A-Z0-9] encodes a lot more efficiently than [a-zA-Z0-9] so there are other considerations when altering a url.

Post by plastic3169 » Mon, Jun 12, 2023, 9:49 AM UTC

Post by throwaway290 » Mon, Jun 12, 2023, 10:29 AM UTC

sdenton4 wrote: post #37

dgreensp wrote: post #10

As an engineer, the lack of consideration for the matter of how much one should corrupt a signal (which might be scanned under different conditions, such as different light levels and resolutions) is grating to me. It’s like scratching a design onto the bottom of an audio CD, playing it, and if it works on your CD player, shipping it. “Works for me”

Meanwhile, bare QR codes are ugly AF and draw the eye away from any other design... Things like this might lead to greater use.

Post by cafxx » Mon, Jun 12, 2023, 11:09 AM UTC

Kuinox wrote: post #42

cafxx wrote: post #39

Earlier quoted context omitted.

Sure, but as I mentioned it has absolutely nothing to do with the CRC calculation, that is what you claimed.

Without CRC calculation you could just check which square correspond to which letter and possibly change the letter casing. But with CRC it will leads to squares changing in the CRC area.

Post by hospitalJail » Mon, Jun 12, 2023, 11:17 AM UTC

dgreensp wrote: post #10

As an engineer, the lack of consideration for the matter of how much one should corrupt a signal (which might be scanned under different conditions, such as different light levels and resolutions) is grating to me. It’s like scratching a design onto the bottom of an audio CD, playing it, and if it works on your CD player, shipping it. “Works for me”