Comments by Nadja Rabizadeh (Top 1 by date)

Thank you!
In my case, I have a video of a skiier, where the skiier's ski board is my reference length. So my reference object is moving with the skiier, does this affect the analysis? I do not know any distance to a fixed object nor the skiier, can I still estimate the distance between the camera and the skiier? You explain this, but I don't exactly understand how to start in order to estimate the velocity perpendicular and parallell to the camera, which I need for my resulting velocity.

If I measure the change in vertical pixel length of the skiier over time, can I then estimate the distance the skiier is moving towards or away from the camera without having the original distance between the camera and the skiier?

Thanks in advance!