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this might be actually useful if glued on a bikeframe: http://joe.framba.ch/qr-code-on-a-cylinder http://joe.framba.ch/qr-code-on-a-cylinder

• zachrose 13y ago
  Entertaining the idea that QR codes should be deformable onto curvilinear surfaces, couldn't this be done by the QR reader, so that it's more "readable" to a person that it is a QR code?
  • mxfh 13y ago
    I think in case of the bike frame the distortion is minor. As I understand it's only there as proof of ownership for the people who really need to know on a hopefully unlikely occasion. So making it not too obvious might be a good idea when it comes to bike theft. The QR-Code is meant to be easy to decode, adding compensation for non-planar surfaces might make it non-trivial to implement on embedded devices.
  • sopooneo 13y ago
    I think most QR code readers can handle reading at an angle, and calculate what angle they're at by the relative distances between the reference squares you'll see in three corners of the code. But telling the difference between a code that is angled on one dimension, and a code that is on a curve would be much more difficult to do reliably. in both cases, one dimension would be compressed, but in the case of the curve, the compression ration would vary.
• joeframbach 13y ago
  Wow, something I did made it on hackernews :)