3 ms·
> 99% of the QR codes you encounter don't have any missing bits I see a lot of cutesy QR codes out there that include a logo in the center. These are basicall
by avian 3y ago
> 99% of the QR codes you encounter don't have any missing bits
I see a lot of cutesy QR codes out there that include a logo in the center.
These are basically intentionally damaged and depend on error correction to recover the missing bits that are covered by the logo.
- vsnf 3y agoNot if they're one of these QR codes[0], which was discussed here a few days ago[1] > Instead of scribbling on redundant pieces and relying on error correction to preserve the meaning, we can engineer the encoded values to create the picture in a code with no inherent errors But as another commenter noted, this likely increases the scan time required. [0] https://research.swtch.com/qart https://research.swtch.com/qart [1] https://news.ycombinator.com/item?id=36128082 https://news.ycombinator.com/item?id=36128082
- londons_explore 3y agoThis QArt technique can be extended with error diffusion dithering... Then the uncontrollable pixels can be hidden in areas of the image which would normally be grey, with the uncontrollable bits error contribution passed onwards to the controllable regions of the image.
- avian 3y agoThese are cool and definitely a much more interesting hack than just sticking a company logo in the middle of the code in Photoshop. But I've never seen one of these in the wild.
- deleted 3y ago[deleted]