1. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 1 of 13 Keeping Faces Straight View Morphing for Graphics TzuYen Wong Supervised by Peter Kovesi & Amitava Datta

2. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 2 of 13 Morphing – fluid transition View morphing – taking viewpoint into account –Straight lines remain straight during the morph In 3D computer graphics Introduction Keeping Faces Straight - View Morphing for Graphics

3. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 3 of 13 Motivations Image morphing review View morphing Validation Results Future Work Outline

4. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 4 of 13 Computer graphics models become more detailed –millions of triangles to represent a model Graphics rendering cost ∝ model complexity Image morphing cost ∝ image size Key frames - rendering Transition frames - morphing Motivation 1: Why Morphing for Graphics?

5. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 5 of 13 Linear morphing path does not preserve 3D shapes View morphing by Seitz utilises computer vision principles to guarantee physically valid transition Motivation 2: Why View Morphing?

6. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 6 of 13 Image Morphing Review Interpolation of shape and colour Cross dissolving Image Warping

7. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 7 of 13 Image Morphing Review (cont.) Pioneered at Industrial Light & Magic: –Mesh morphing (Smythe 1988) Various improvements: –Feature line pairs (Beier & Neely 1992) –Feature polylines, curves and points –Automatic feature specification (Gao 1998) –Warp generation as scattered data interpolation –Transition control (Lee 1995) –Shape preservation (Seitz 1996, Xiao 2004)

8. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 8 of 13 View Morphing: Parallel View Linear interpolation of point position is shape preserving in parallel view X x1x1 x2x2 C1C1 C2C2 f1f1 f2f2 I1I1 I2I2  x 2 +  x 2 CC ff II

9. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 9 of 13 X C1C1 C2C2 I1I1 I2I2 View Morphing: Non-Parallel View Three steps algorithm: –Prewarp: reproject non- parallel views I 1 & I 2 into parallel views Î 1 & Î 2 –Morph: create Î  by linearly interpolating Î 1 & Î 2 –Postwarp: reproject Î  to the desired camera configuration and yield image I . Three steps algorithm: –Prewarping –Morphing –Postwarping CC II ^ Morphing –Morph: create Î  by linearly interpolating Î 1 & Î 2 II Postwarping –Postwarp: reproject Î  to the desired camera configuration and yield image I . I1I1 ^ I2I2 ^ Prewarping Three steps algorithm: –Prewarp: reproject non- parallel views I 1 & I 2 into parallel views Î 1 & Î 2

10. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 10 of 13 Validation Results – Non-straight Faces Desired Views Linear interpolation

11. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 11 of 13 Validation Results – Straight Faces Prewarping Morphing Postwarping

12. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 12 of 13 1.Epipoles inside images 2.Automatic feature correspondence 3.Warp generation error measurements 4.Edges behaviour 5.Optimisation of computation on hardware Future Work

13. 13th UWA CSSE Research Conference, Yanchep, Western Australia, 20 th -21 st September 2004. Slide 13 of 13 Keeping Faces Straight View Morphing for Graphics TzuYen Wong Supervised by Peter Kovesi & Amitava Datta