Structure from Motion
Arrowsmith, Nissen, Saripalli
http://robotics.asu.edu/
Littlerock Motorized kite (watch out for the wind!)
$600 for kite
Main differences are datum
offset (~30 m) and positioning
(using camera GPS)
SFM-B4
Mulitview
stereo and
structure
from motion
applied to
volcanic
bomb,
coastal cliff
erosion,
volcano
caldera
Structure From Motion Procedure
Structure from Motion
• Calibrate Camera (“performed with the same
images”)
• Take pictures which have some overlap
• Find points which are same in both images
• Determine how these points have changed
between images
• Create a Digital Surface Model and 'drape' the
images over the model (Texture Map)
• Software = AGISOFT PHOTOSCAN (<$3500)
Unmanned Aerial Vehicles
also kites, balloons
Structure from motion
using balloon aerial
photography with Sri
Saripalli
$500 balloon plus gear
Lofting on He balloon Canon camera
with GPS tagging and 2 second
interval shooting
Can lift a few kg
Solve for 6 camera
positions (examples)
Example 6 image DEM
=16 pixels / m = ~25 cm dem
Structure from motion orthophoto texturemap
(also can generate <10 cm DEM)
Click to start video