**Parallel views**

- Suppose the camera has moved from the world origin to the
position
and the two projection matrices are
- Let and are image projections of a scene point .
- Linear interpolation of
and
yields
- represents a camera with center and focal length .

**Linear morph is consistent with a physical pin-hole camera**.

**Non-parallel camera**

- When two images share the optical center they are related by a planar homography.
- Thus there exist planar homographies between , and .
- View morphing can be achieved as a 3 step process.

**The results also hold for uncalibrated cameras**.

Subhashis Banerjee 2008-01-21