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Thanks amazing. Thanks! I always wondered how companies create their own type of QR-code. Anyone has any idea how something like this can be built? https://i.im

Thanks amazing. Thanks! I always wondered how companies create their own type of QR-code. Anyone has any idea how something like this can be built? https://i.imgur.com/wtxZDdh.png https://i.imgur.com/wtxZDdh.png

xhruso00 8y ago
Messenger codes: https://itunes.apple.com/us/app/scan-code-editor-for-messenger-codes/id1148316864?mt=12 https://itunes.apple.com/us/app/scan-code-editor-for-messeng...
- luisrudge 8y ago
  I’m wondering how can I build a custom qr code like those for my own project, but thanks for the link
  - ribasushi 8y ago
    https://research.swtch.com/qr/draw https://research.swtch.com/qr/draw
nayuki 8y ago
Please don't call these QR codes; they are simply proprietary 2D barcodes (respectively Facebook Messenger and Snapchat). The Snap code looks like a 18×18 grid of dots with the center punched out. This probably conveys about 200 bits of information. I suppose that could encode 30 ASCII characters which should be enough to describe a unique username. Or maybe it is a random binary number that is an opaque user ID in Snapchat's database. Either way, I'm guessing that the graphics and algorithm are a trade secret, so you can't get a definitive truth on how these barcodes are generated. The Messenger code seems hard to analyze because of its different bar lengths and circular layout. The four bulls-eye patterns remind me of QR alignment patterns. I have no idea what the information-theoretic capacity is, but I'll guess it's in the order of magnitude of 500 bits. Again, I suspect the algorithm is not available to the public. As for Spotify Codes, I discussed them in https://www.reddit.com/r/programming/comments/9th8a7/creating_a_qr_code_step_by_step/e8wdq5l/ https://www.reddit.com/r/programming/comments/9th8a7/creatin... .