How would one simulate zoom/tilt transformations on the broadcast view and/or the topdown view?
To assist, I have the pan transform already. You find the convergence of the long quadrilaterals lines on the topdown view and then rotate the quadrilateral around the convergence. But things get more tricky when you move into zoom/tilt:
Tilt seems to require finding the point of perspective on the broadcast view on a 3D coordinate system? I will try this but are there any simpler methods?
Zoom in seems to require shifting the corner points of the quadrilateral on the topdown view towards the middle of the quadrilateral by the same proportion?
EDIT: I'm doing this to build a tool to match broadcast scenes of a football match to different perspective views of the field. That way we can transform the view into a topdown view using a saved broadcast to topdown-view homography. To do this we need a set of all possible broadcast views of the field... to create those we can just use the different perspective tranforms from a set of original manually created views (retrieved from football broadcasts). Here is a sample paper I'm using through out this.