bar code scanners on the XO

[Ivan Krstić]

On Feb 15, 2008, at 4:35 PM, Benjamin M. Schwartz wrote:
> As you are probably aware, it is possible to read barcodes from the
> camera, using software analysis.

We have code in git that encodes arbitrary (but size-constrained) data  
as a redundant datamatrix barcode and shows it on the screen, and code  
that performs image analysis from a camera capture when one XO is  
pointed at another with such a barcode on the screen to decode the  
original data:

     <http://dev.laptop.org/git?p=projects/barcode;a=tree>

The original purpose was to facilitate a physical public key exchange  
("digital introduction") by holding two laptops up to one another.

--
Ivan Krstić <krstic at solarsail.hcs.harvard.edu> | http://radian.org