10 Is a Power of 2
summary
Explains how the UPC barcode encodes a 12-digit code into a ~95-module-width symbol using seven modules per digit plus start/center/stop guards and left/right parity to detect scanning direction. Covers design trade-offs—parity and digit encoding choices reduce combinations and enforce bar-width alternation, and a checksum digit improves error detection—plus implementation details using laser scanners and results showing reliability suitable for mass rollout.
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chapters (11)
- 0:00Introduction
- 1:15SPECIFICATIONS
- 2:18BINARY CODING
- 5:35CALIBRATION AND START/END
- 6:02CENTRAL GUARD
- 6:237 MODULES PER DIGIT
- 7:05THEORY AND PRACTICE
- 8:55MEASUREMENT ERROR
- 9:304 BANDS PER DIGIT
- 12:2326 JUNE 1974
- 13:10CHECKSUM
