3 ms·
I was curious how this would compare to QR codes: TFA suggests that consumer scanners and printers can successfully work at a minimum of 200DPI. A QR code can
by aidenn0 3y ago
I was curious how this would compare to QR codes:
TFA suggests that consumer scanners and printers can successfully work at a minimum of 200DPI. A QR code can store almost 3kB in a 177x177 matrix, which allowing for some padding nicely fits in a square-inch @200DPI.
This would allow approximately 285485 bytes per page before compression. For better error-correction, you could up the ECC in qr codes, or you could apply reed-solomon to the data before encoding. The latter has the advantage of correcting errors that take out most of a single QR code.
- mateo1 3y agoI did something similar a few years back. Basically converted binary data to a matrix and printed it max res (1200dpi inkjet), also wrote the software to read it like a QR code (with perspective & error correction etc). You can easily save several MB per page. The theoretical number is much much higher for color printing, but is gets very complicated (inkjects are basically stochastic with regards to dots, YMCK balance is finicky etc). Also some time after that project I noticed that some gov agencies use printed "QR" codes to send sensitive data (ie biometrics) from office to office in the traditional mail format. It works, but so do floppy disks and nobody's using them anymore for a reason. It was a cool project though.
- robsh 3y agoHCCB is like a color QR