Sander de Regt wrote:Object tracking is even more difficult, as far as I can tell. Objects are smaller in the frame, usually have less features to track, can move in depth so their pivot point is all over the place and objects can be handled so they're occluded lots of the time. But that's my 0.02 cents.
That makes sense. I was thinking since the camera tracker analyzes a lot of points and the depth they move along on, you just have to specify certain areas of the footage and object tracking would be simpler. But I guess I'm off the mark by oversimplifying it this way.
Hendrik Proosa wrote:Practical considerations aside (that Sander laid out), it makes no difference whether motion is solved for camera or for object, it is just a matter of reference coordinate system. In one case world is static and camera moves, in another camera is static and object ”world” moves. Usually both move, in that case camera is solved first so that world coordsys can be established.
That sounds like we just haven't requested this feature enough. Though I doubt nobody has.
Bryan Ray wrote:Can't solve a pair of hands as a camera, though, as they move independently. You can solve a single object that way, but not two.
Guess that explains why it's more difficult as well. That's like a 3-camera system. There's one main camera that looks at the whole scene, and a bunch of others to relate the objects within the scene.