| Geometric properties of projection |
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| • | Points go to points |
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| • | Lines go to lines |
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| • | Planes go to whole image |
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| • | Polygons go to polygons |
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| • | Degenerate cases |
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| – | line
through focal point to |
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| point |
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| – | plane
through focal point |
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| to
line |
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