Re: [OVC-developer] PDF417

From: Fred McLain <mclain_at_zipcon_dot_net>
Date: Wed Apr 26 2006 - 21:45:06 CDT

Great work Jan!

I wonder how we can match a reader that will accept this bar code format
within the limited budgets of voting activists. I agree though that a
denser format is needed then the first phase demo provided.

I've been unsuccessfully trying to find a place where very large files
are readily uploaded/downloaded for the project. Notably we have not
been able to redistribute the G4 Linux ISO that Will provided. No
matter what I try SF times out. Do you have any thoughts on this? It's
driving me nuts!

        -Fred-

On Tue, 2006-04-25 at 22:27 +0200, Jan Karrman wrote:
> We had a discussion earlier about using some other barcode on
> the ballot, such as PDF417, a 2d barcode. Now I have made a font
> for printing PDF417, and have updated the demo source code at
> SourceForge to support this. By default it behaves as before,
> but if you set the environment variable BARCODE to PDF417 before
> starting the graphical or reading impaired interface, you will
> get the new barcode on the generated ballot. I have also updated
> the BVA to play back write-in names (it uses the same audio files
> that Cory made for the RII - it spells out the names "A as in
> Alpha" etc).
>
> Advantages with PDF417 are the high capacity, and ability to do
> error corrections. I have made a sample ballot where I entered
> write-in names in every possible contest, and selected an error
> correction two levels higher than recommended for barcodes of
> this size:
>
> http://user.it.uu.se/~jan/voting-project/pdf417.pdf
>
> As you can see, the barcode is about the same size as the old one.
> I was able to scan it after having placed a pen across the barcode
> - so it should survive minor scratches, chocolate smudges etc.
>
> The disadvantage is that PDF417 capable barcode scanners are more
> expensive (sorry Alan, the Cue Cat can't cope with this one ;-),
> but as Ed Cherlin pointed out earlier, it can be done in software:
>
> http://gnosis.python-hosting.com/voting-project/initial-digests/0042.html
>
> There are probably other free tools for PDF417 that can be used,
> but since I like to do things like this...
>
> /Jan
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>
>

-- 
I've come to the conclusion that people forget about regular Java objects 
because they haven't got a fancy name - so while preparing for a talk 
Rebecca Parsons, Josh Mackenzie and I gave them one: POJO (Plain Old Java 
Object).  A POJO domain model is easier to put together, quick to build, 
can run and test outside of an EJB container, and isn't dependent on EJB 
(maybe that's why EJB vendors don't encourage you to use them.)?  
~ Martin Fowler
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Received on Tue May 2 21:06:53 2006

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