Calibration for absolute scale

[kozuch]

Hi there,

thanks a lot for your software. I would like to "augment" (make more accurate/precise) my plain GPS unit's readings with visual odometry (acutally do sensor fusion). The use case would be when one is in city downtown with high buildings then the GPS readings are unreliable in some situations and I would like to compensate for this with visual odometry.

My question is following - is it possible to calibrate a given mono camera setup to introduce an absolute scale for its odometry output? I mean something like to travel a known distance (say 100m) and then introduce some constant to odometry calculation so that it would know itself it took 100m for future measurements?

I will appreciate your answer a lot! Thanks in advance!

[ghost]

No its not possible with a mono camera. you need another source for the scale estimation. stereo, ground control points, etc...