[OSM-talk] GeoQR - Geocoding Video with QRCodes

[Ben Ward]

Hi Simon,

On Wed, Apr 29, 2009 at 5:06 PM, <simon at mungewell.org> wrote:


>
> The only question I have (and this is not a put down) is why?
>

I was fairly confident someone would see the heavy processing flaw :-)


>
> Any encoding on the video image is going to reduce the quality of the
> barcode image and thus make it a little harder to read and apart from
> being cool not many people can read 2D barcodes by eye.
>

This is true, I'm waiting for the open standard to settle before getting my
brain 2D barcode enabled.

The reason I chose a QR Code (or any other barcode) is that it's machine
readable even in blurry and twisted orientations, making it quite robust on
encoded video.  Turns out I can record at a resolution lower than it can be
normally read.  When I enlarge the extracted png to 2x size it still works.
Plus QuickMark on Symbian S60 makes a funny noise when it captures that
appeals the child in me. ;-)


> Personally I would think encoding the NMEA string into APRS beacons (or
> the like) onto the audio track would be the way to go. That way it could
> be done without any processing power in the car - just a GPS, APRS encoder
> (can be a simple as a PIC or OpenTracker) and a camcorder with a line/mic
> input.
>

Yes, definitely audio is the least processor-intensive way of getting a
synchronised input.  I was mostly faffing.  I've seen FSK used, can APRS be
recorded onto an audio track then?



>
> If you are going to process the video you could render the GPS data as a
> human readable graphic overlay (think speedometer, compass heading,
> lat/long, etc) onto the video... but why not include a 2D barcode too.
>

I should be able to do that stuff, but VLC didn't seem to offer much in the
way of text overlay, just image overlay. I suppose I could make text into an
image with an alpha channel.  Anyway, this isn't really a big deal for me,
just an interesting exercise in faffing.


>
> Anyway 'way cool',
> Simon.


Thanks :-)


Ben

-- 
ben at crouchingbadger.com | http://crouchingbadger.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk/attachments/20090429/f9fd8559/attachment.html>