| Projective lines |
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| What does a line
in the image correspond to in |
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| projective space? |
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| • | A line is a plane
of rays through origin |
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| – | all rays (x,y,z)
satisfying: ax + by + cz = 0 |
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| l |
| p |
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| • | A line is also
represented as a homogeneous 3-vector l |
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