Fwd: bar code scanners on the XO

From: Edward Cherlin <echerlin_at_gmail_dot_com>
Date: Mon Feb 18 2008 - 01:09:42 CST

FYI

---------- Forwarded message ----------
From: Ivan Krstić <krstic@solarsail.hcs.harvard.edu>
Date: Feb 17, 2008 1:36 PM
Subject: Re: bar code scanners on the XO
To: "Benjamin M. Schwartz" <bmschwar@fas.harvard.edu>
Cc: OLPC Devel <devel@laptop.org>

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@solarsail.hcs.harvard.edu> | http://radian.org
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Edward Cherlin
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Received on Fri Feb 29 23:17:07 2008

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