example code for #HTML5 camera API (#getUserMedia) to detect cameras (in this case for a #barcode #QR reader)
on 02023-02-07another #barcode #archival system, "qr-backup", which uses ordinary QR codes
on 02022-09-16Twibright "Optar", a printable #barcode for #archival on paper: 200 kB per page. “The printer, although having 600dpi nominal resolution, cannot reliably print individual white and black dots with 600dpi. The practical limit is at 200dpi, i. e. 3x3 pixel squares.”
on 02022-09-16