structure from motion arrowsmith, nissen, saripalli
TRANSCRIPT
Structure from Motion
Arrowsmith, Nissen, Saripalli
http://robotics.asu.edu/
Littlerock Motorized kite (watch out for the wind!)
$600 for kite
SFM-B4difference
Main differences are datum offset (~30 m) and positioning (using camera GPS)
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)
=16 pixels / m = ~25 cm dem
Example 6 image DEM
Structure from motion orthophoto texturemap (also can generate <10 cm DEM)
Click to start video