clipka wrote:

> 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.

Depends which symbiology.

Data Matrix uses black bars along two sides of the rectangle, as does 
Semacode. MaxiCode has a "bull's eye" of concentric circles at the 
center, while Aztec Code has concentric squares instead. And then QR 
Codes have squares on three corners...

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