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Oct 19, 2017 at 8:17 comment added Matthias Explicitly thanks for the clarification "Some information is lost, though: the sign of $w$, which corresponds to whether a point was behind or in front of the camera."
Oct 19, 2017 at 8:15 vote accept Matthias
Oct 18, 2017 at 19:58 history answered Nathan Reed CC BY-SA 3.0