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Feature-based
methods
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Extract visual
features (corners, textured areas) and track them
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over multiple
frames
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Sparse motion
fields, but possibly robust tracking
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Suitable
especially when image motion is large (10-s of pixels)
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Direct-methods
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Directly recover
image motion from spatio-temporal image
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brightness
variations
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Global motion
parameters directly recovered without an
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intermediate
feature motion calculation
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Dense motion
fields, but more sensitive to appearance variations
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Suitable for
video and when image motion is small (< 10 pixels)
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