2 ms·

QR codes use Reed Solomon codes

• jtlienwis 5y ago
  So do pdf-417 barcodes. I remember writing the code for pdf417_decode and pdf417_encode (freeware) back in the day. The Blahut book on error correcting codes was a great help, but all the examples where using binary galois fields. The pdf-417 used a field of powers of 3 mode 929, so my brain had to figure out how that worked and put it into code.