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The Cartoon Animation Filter

The Cartoon Animation Filter. Jue Wang Steven Drucker Maneesh Agrawala Michael Cohen. The Cartoon Animation Filter. Goal Add “liveliness” to any motion signal Should be Simple General As automated as possible Fast enough for real-time interaction. A very boring animation.

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The Cartoon Animation Filter

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  1. The Cartoon Animation Filter Jue Wang Steven Drucker Maneesh Agrawala Michael Cohen

  2. The Cartoon Animation Filter • Goal • Add “liveliness” to any motion signal • Should be • Simple • General • As automated as possible • Fast enough for real-time interaction

  3. A very boring animation

  4. Follow-through x’’ -x’’ -x’’ , x -x’’ + x Anticipation x*(t) = x(t) + x’’(t)*- x x’ x’’ time

  5. An almost as boring animation

  6. x*(t) = x(t) + x’’(t)*- x*(t) = x(t) + x(t)*- ’’ -LoG

  7. Convolution with -LoG Error in equation (2): x*(t) = x(t) * -LoG x*(t) = x(t) + x(t) * -LoG

  8. -LoG Parameters • Amplitude – user set • Width (frequency) – automatically set [later] s

  9. Image Sharpening

  10. Image Sharpening

  11. Demo 3 • Show ball with vectors forward and backward • Show 3 copies of curve, original and time shifted forward and back • Convolve • Show squash and stretch ball again

  12. p Squash and Stretch x’’ LoGp(t) = LoG(t+Dt) Dt ≈ x’’·p

  13. Squash and Stretch x’’ • Volume Preservation • Inversely stretch/squash orthogonally to acceleration time

  14. Squash and Stretch

  15. Related Work • Physically Based, lots • Stylized, e.g., Chenney et al. 2005, Igarashi et al. 2002 • Surface Deformation, lots… • Signal Based, e.g., • Unuma et al. 1995, • Bruderlin and Williams, 1995 • Video Paintbox, Collomosse 2004 • Motion Magnification, Liu et al. 2005

  16. Livening Up Powerpoint

  17. Livening Up Powerpoint

  18. Enhancing Video Objects

  19. Enhancing Video Objects

  20. Enhancing Video Objects • Need to maintain constraints • Simplest approach • Move figure in each frame vertically to keep feet/skateboard in place

  21. Enhancing Video Objects

  22. Enhancing Video Objects

  23. Enhancing Video Objects

  24. Enhancing Video Objects

  25. Enhancing Video Objects

  26. Golfswing • Apply filter to each DOF independently • What should the filter width be?

  27. fixed s adaptive s Setting LoG Width s(t) = 2p /w*(t) w*(t) = maxw|X(w)| w w*(t) = maxw|F(x’(t))| (over 32 frame window) q original time

  28. Walking

  29. Boxers

  30. Boxers

  31. Boxers

  32. Discussion • (Almost) fully automated • NOT a tool for experts • But may make good first cut • Need better constraint maintenance • IK, physical constraints • Online (in-game) usage • Single animation adjusts to situation

  33. Where from here? • Make a kid’s animation system

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