If you have a rough idea how it works, include these in your google queries to get results that go into details ;) Some more things to include: - perspective

If you have a rough idea how it works, include these in your google queries to get results that go into details ;) Some more things to include: - perspective correction may be needed (the surface with the QR code is not parallel to the image plane, so pixels further away get smaller) - if the algorithm takes parameters, such as color filters / black-vs-white thresholds, try with different parameter sets in sequence. The user is pointing the camera at the code for a relatively long time, compared to the time it takes to process an image. - pixely images should produce a recognizable pattern in the fourier transform of the image. This gives you the size AND rotation at once. (edit: formatting)