3 ms·

Also, couldn't error correction allow you to only put part of the QR code?

• edent 6y ago
  Sort of. The 21x21 QR has an error correction of "L". That means up to 7% of the data area can be obscured. Realistically, as the code is a square, you could only lose data from the right hand side while maintaining integrity. A QR with "H" error correction can lose about 30% - but the code takes up a lot more pixels.
• lifthrasiir 6y ago
  QR code needs alignment patterns (5 by 5 bullseye shape) at correct positions to compensate distortion, so that limits the actual saving from entirely omitting the data because removing anything left of alignment patterns would not reduce the size. You also have to account for masking but that's a minor issue (the optimal masking algorithm is a recommendation and not a requirement).