Re: Poor Reliability.. better idea
[...] These lines match the number 6 [...]
Yeah, erm, no: because the encoding for each digit is actually 7 stripes wide, so "6" isn't "two narrow black lines", it's:
- "black-white-black-white-white-white-white", or
- "white-white-white-white-black-white-black", or
There's three encodings for the other digits, too, then a way of encoding the first digit (in EAN-13) by swapping between encodings for the first 6 digits.
Barcode scanners work out which way round the barcode is by attempting to decode it: there's only one correct way.