[Bf-vfx] tracker constraints and camera reconstruction...

[David Jeske]

On Fri, Aug 16, 2013 at 6:36 AM, Francesco Callari <fgcallari at gmail.com>wrote:

> A plane (or indeed any known model) helps solving the scene because it
> reduces the size of the search space.
>
> Simple example: a rigid box of known size is in the scene, its vertices
> (or any points on its surface) are tracked. You add a model and contrain it
> so that it is forced to stay attached to the tracks. Then you can solve for
> the location and pose of the box (6 parameters), instead of the 3D location
> of the tracked points, which may be a lot more. And the solution will be
> more robust because it will automatically average out the track errors.
> Generalize, and you end up solving for a known scene graph, rather than
> just a bunch of unconnected points. It's called "photomodeling".
>

This is interesting and goes far beyond what I was thinking with
plane-constraints (though not necessarily in a complex way).

If there were a mechanism for specifying persistent constraints between
trackers and 3d-models WRT camera-solving, it might also be practical to
use this to handle origin/floor/scale as well. (current origin/floor/scale
is frustrating, as they are not persistent constraints but actions which
need to be repeated after every camera solve)
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