Fwd: bar code scanners on the XO

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


---------- 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:


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
Devel mailing list
Edward Cherlin
End Poverty at a Profit by teaching children business
"The best way to predict the future is to invent it."--Alan Kay
OVC-discuss mailing list
By sending email to the OVC-discuss  list, you thereby agree to release the content of your posts to the Public Domain--with the exception of copyrighted material quoted according to fair use, including publicly archiving at  http://gnosis.python-hosting.com/voting-project/
Received on Fri Feb 29 23:17:07 2008

This archive was generated by hypermail 2.1.8 : Fri Feb 29 2008 - 23:17:08 CST