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[Paparazzi-devel] georeferencing video stream?

From: Chris Gough
Subject: [Paparazzi-devel] georeferencing video stream?
Date: Wed, 30 Sep 2009 09:41:57 +1000

Sorry if this is be a bit off topic, but...

The Thales SpyArrow presentation linked to from the wiki home page
( refers to a
system where the live video stream is georeferenced, and shows images
of what appears to be a stitched image. I'm interested in how to do
this, and was hoping somebody might give me some hints.

I had imagined post-processing (on the ground) combination of video
and telemetry:
 1. Convert the video stream into a "timestamped sequence of images"
as they arrive,
     using the native features of a video capture card and operating system.
 2. Interpolate the telemetry stream to estimate {lat, long, altitude,
pitch, roll, yaw}
     at the exact time of each image.
 3. Orthorectify each image and load them into a temp GIS raster layer
in a database
 4. Use elevation model and some geometry to infer the locaction of
some points in
     the streatched image.
 [4b. use fancy pattern recognition and/or umpa-lumpas to identify points...]
 5. Process the images (stitch, filter, etc) and post fixed
rectangular tiles to another
     GIS layer.
 6. Combine tiles (perhaps allong with other spatial data) in a GIS
client to produce
     images/maps as required (periodically refreshed).

am I on the right track? Is there a working open source solution already?

Chris Gough

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