| Problem definition: optical flow |
| How to estimate pixel
motion from image H to image I? |
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| • | Solve pixel
correspondence problem |
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| – | given a pixel in
H, look for nearby pixels of the same color in I |
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| Key assumptions |
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| • | color
constancy: a point in H looks the same in I |
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| – | For grayscale
images, this is brightness constancy |
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| • | small
motion: points do not move very far |
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| This is called
the optical flow problem |
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