scott wrote:
>> Except that a human wouldn't aim the laser beam at random, see?
> 
> Humans don't aim the beam, usually it's wiggled about all over the place 
> automatically very quickly, in the hope of picking up a valid barcode 
> scan at some point.  You could do the same on a 2D image (just pick 
> points at random on the edges and scan between them).

Actually you could do better. You could search around for a rectangular 
area of white with black stuff inside it, try to figure out the 
orientation of its edges, and then skim a line across the line edge. 
It's kinda tricky though...

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