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>> 8. If you're using a 2D *camera* instead of a real laser barcode
>> scanner, multiply all of the above issues by 7.
>
> Not really. Just pick a random straight line through the picture, and
> pretend that's your laser beam.
Except that a human wouldn't aim the laser beam at random, see? Also, as
I understand it, lasers don't go out of focus...
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