| Measuring height |
| vz |
| r |
| t0 |
| vanishing line
(horizon) |
| t0 |
| vx |
| vy |
| v |
| m0 |
| t1 |
| b0 |
| b1 |
| b |
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| What if the point
on the ground plane b0 is not known? |
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| • | Here the guy is
standing on the box, height of box is known |
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| • | Use one
side of the box to help find b0 as shown above |
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