1. Announcements Review on Thurs Project 4 Extra office hour: Friday 4-5
due Wed night
no later than Friday night (with late days)
Extra office hour: Friday 4-5

2. Photograph
Photograph

3. Virtual Camera
Morphed View

4. View Interpolation Problem Statement
Input: two views of an unknown rigid scene
from unknown viewpoints
Output: in-between views from a virtual camera

5. Image Morphing Photograph Photograph Photograph Morphed Image
Linear Interpolation of 2D shape and color

6. Image Morphing for View Synthesis?
We want physically-correct view interpolations
Can image morphing do this?
Not quite...
Goal: extend to handle changes in viewpoint
Produce valid camera transitions

7. Special Case: Parallel Cameras
Left Image
Morphed Image
Right Image
Morphing parallel views new parallel views
Linear image motion linear camera motion
Works because projection matrices have a special form

8. View Morphing in 3 Steps
Input
Output
Input

9. View Morphing in 3 Steps
1. Prewarp
align views

10. View Morphing in 3 Steps
1. Prewarp
align views
2. Morph
move camera

11. View Morphing in 3 Steps 1. Prewarp 2. Morph 3. Postwarp align views
move camera
3. Postwarp
point camera

12. Corrected Photographs
Face Recognition
Corrected Photographs

13. Videos View morphing Blanz & Vetter (SIGGRAPH 99)
MIT single view (SIGGRAPH 01)
Yu inv-radiosity (SIGGRAPH 00)
Debevec relight (SIGGRAPH 02)
Video rewrite (SIGGRAPH 97)
Vision-based pong (Seitz tape)
Debevec IBMR in art & cinema tape
Debevec face relighting demo