| Feature detection |
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| Local measure of
feature uniqueness |
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| • | How does the
window change when you shift it? |
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| • | Shifting the
window in any direction causes a big change |
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| “corner”: |
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| significant
change |
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| in all directions |
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| “flat” region: |
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| no change in all |
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| directions |
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| “edge”: |
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| no change along |
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| the edge
direction |
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