| Feature distance |
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| How to define
the difference between two features f1, f2? |
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| • | Better
approach: ratio distance = SSD(f1,
f2) / SSD(f1, f2’) |
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| – | f2 is best SSD match to f1 in I2 |
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| – | f2’ is
2nd best SSD match to f1 in I2 |
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| – | gives
small values for ambiguous matches |
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| f1 |
| f2' |
| f2 |
| I1 |
| I2 |