Why a Ripped QR Code Still Scans

Tear off a corner and a QR code STILL scans. Here's the real reason, built from scratch with no jargon. Start tiny: to protect two numbers (a 3 and a 5) over a bad connection, plot them as points, draw the one line through them — then SEND EXTRA points on that line. Lose some, and the survivors still fix the line, so you read your numbers back. Scale a line up to a curve and that's Reed-Solomon error correction (Reed & Solomon, 1960). A QR writes those points as squares in binary (black = 1, white = 0), and over-samples the curve so a tear just loses spare points it rebuilds. It's literally why a QR with a logo in the middle still scans (the logo is healed damage), why scratched CDs play on, and how Voyager sent photos home from deep space — where there's no asking for a resend.

#qrcode #maths #reedsolomon #errorcorrection #howitworks #mathexplained #technology #voyager

Music by Kevin MacLeod (incompetech.com), licensed under Creative Commons: By Attribution 4.0 — http://creativecommons.org/licenses/by/4.0/

Видео Why a Ripped QR Code Still Scans канала Math Enthusiastic