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Gyscos schrieb:
> Isn't there some bars at the beginning or the end that indicate the encoding ?
No, not really. Though many barcodes include some "frame" to (a)
identify the side at which the barcode starts, and/or (b) calibrate for
the size of the barcode; such frames can often double-act to prevent
misinterpreting other barcode types.
For instance, Code39 IIRC always starts and ends with the bars it uses
for the Asterisk (*).
EAN-13, on the other hand, uses one pair of simple bars at the
beginning, end, and in the middle, respectively, to calibrate for size,
while the reading direction can unambiguously be inferred from any
"character" of the barcode "payload".
But these "frames" are only standardized for each individual barcode
type, and there is no universal scheme to identify the type. All you can
do is test for which types of barcode this particular specimen reads
without error.
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