structure from motion arrowsmith, nissen, saripalli
TRANSCRIPT
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Structure from Motion
Arrowsmith, Nissen, Saripalli
http://robotics.asu.edu/
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Littlerock Motorized kite (watch out for the wind!)
$600 for kite
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SFM-B4difference
Main differences are datum offset (~30 m) and positioning (using camera GPS)
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Mulitview stereo and structure from motion applied to volcanic bomb, coastal cliff erosion, volcano caldera
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Structure From Motion Procedure
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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)
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Unmanned Aerial Vehicles
also kites, balloons
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Structure from motion using balloon aerial
photography with Sri Saripalli
$500 balloon plus gear
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Lofting on He balloon Canon camera with GPS tagging and 2 second interval shooting
Can lift a few kg
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Solve for 6 camera positions (examples)
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=16 pixels / m = ~25 cm dem
Example 6 image DEM
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Structure from motion orthophoto texturemap (also can generate <10 cm DEM)
Click to start video