lec18 - Motion Computer Vision I CSE252A Lecture 17 CS252A...

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1 CS252A, Fall 2010 Computer Vision I Motion Computer Vision I CSE252A Lecture 17 CS252A, Fall 2010 Computer Vision I CS252A, Fall 2010 Computer Vision I Structure from Motion Locations of points on the object (the “structure”) The change in spatial location between the two cameras (the “motion”) MOVING CAMERAS ARE LIKE STEREO CS252A, Fall 2010 Computer Vision I Motion Some problems of motion 1. Correspondence: Where have elements of the image moved between image frames 2. Reconstruction: Given correspondence, what is the 3-D geometry of the scene 3. Segmentation: What are regions of image corresponding to different moving objects 4. Tracking: Where have objects moved in the image? related to correspondence and segmentation. Variations: Small motion (video), Wide-baseline (multi-view) CS252A, Fall 2010 Computer Vision I Is motion estimation inherent in humans? Demo CS252A, Fall 2010 Computer Vision I Motion “When objects move at equal speed, those more remote seem to move more slowly.” - Euclid, 300 BC
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2 CS252A, Fall 2010 Computer Vision I The Motion Field Where in the image did a point move? Down and left CS252A, Fall 2010 Computer Vision I The Motion Field CS252A, Fall 2010 Computer Vision I What causes a motion field? 1. Camera moves (translates, rotates) 2. Object’s in scene move rigidly 3. Objects articulate (pliers, humans, animals) 4. Objects bend and deform (fish) 5. Blowing smoke, clouds CS252A, Fall 2010
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