What is meant by "scale" in case of monocular visual odometry?

asked 2016-05-23 11:02:46 -0500

ank700 gravatar image

The following are 2 reasons why monocular visual odometry is not the best option:

1) Results from monocular sequences can only be recovered up to a 'scale'; without additional information, absolute measurements are not possible.src

2) All pose estimates from a mono VO algorithm are relative to some unknown 'scaling factor'.src

Can someone please explain what exactly is meant by the 'scaling factor' and how does it affect visual odometry?

Thanks

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