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Great stuff! QR code is optimized for low error rates when the channel is a digital camera-based, single photo capture. If one uses a code designed for multipl
by j1vms 8y ago
Great stuff! QR code is optimized for low error rates when the channel is a digital camera-based, single photo capture. If one uses a code designed for multiple capture over time (some video code), the transfer speed could be increased significantly. Thinking of it like a very noisy fibre optic channel, there's plenty of room for improvement.
- j1vms 8y agoAlso, as a practical aside, two mobiles devices could use their screens and front-facing cameras to negotiate a secure session for key-exchange, etc.
- reaperducer 8y agoIsn't this essentially how Apple Watch pairing happens?
- divan 8y agoNope. Apple Watch pairing is unidirectional and low-bandwidth, and uses extremely cool patented technique with hiding data in luminance changes. It's exploiting the fact that human eye is so much more sensitive to the chrominance changes, rather than luminance, but computers is not. http://www.iphonehacks.com/2015/05/new-apple-patents-explain-particle-cloud-pairing-method-used-for-apple-watch.html http://www.iphonehacks.com/2015/05/new-apple-patents-explain...