Invisible schrieb:
>>> 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...

A human wouldn't aim a camera at random either. And as for the focus 
thing, just use an auto-focusing camera and you're there.

Of course, if you want to make the /most/ out of a camera-based device, 
to actually unleash all the advantages a camera potentially has over a 
laser-based device - now that's a totally different story...

... but in that case you'd use 2D barcodes anyway :-)

There are matrix barcodes out there that I'd expect to be particularly 
easy to use in this sort of application, featuring "bull's eye"-like 
patterns or the like to faciliate finding the center by basically doing 
some simple frequency filtering on the image.

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