motion and tracking - ucsblbmedia.ece.ucsb.edu/member/uweb/teaching/website/ppt... ·...
TRANSCRIPT
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Motion and Tracking
Xin Yang
2017-03-28
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Last Time: Why multiple views?
• Structure and depth are inherently ambiguous from single views.
Images from Lana Lazebnik
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Last Time: Geometry for a simple stereo system
• First, assuming parallel optical axes, known camera parameters (i.e., calibrated cameras):
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baseline
optical center (left)
optical center (right)
Focal length
World point
image point (left)
image point (right)
Depth of p
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• Assume parallel optical axes, known camera parameters (i.e., calibrated cameras). What is expression for Z?
Similar triangles (pl, P, pr) and (Ol, P, Or):
Geometry for a simple stereo system
( )l rT x x T
Z f Z
l r
TZ f
x x
disparity
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Last Time: Depth from disparity
image I(x,y) image I´(x´,y´) Disparity map D(x,y)
(x´,y´)=(x+D(x,y), y)
So if we could find the corresponding points in two images, we could estimate relative depth…
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Today: Motion Field
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Perceived motion
Actual motion
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Perceived motion
Actual motion
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Online Tracking by Learning Discriminative Saliency Map
with Convolutional Neural Network. ICML 2015
Step 1
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Step 2
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Step 2
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Step 2
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Step 2
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Step 3
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Step 3
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Step 3
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Step 3
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Step 4
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