Facial Animation

类比Skining，一起理解

• Blend Shapes

  $\vec v=\vec v_0+\sum w_i\vec v_i$, blend shapes

• Linear Blend Skinning techniques (LBS)

normal interpolation

Smooth skinning

• Transform Blend

Deformed vertex position is a weighted ave over many joints

$v''=\sum w_iH_i^0\cdot(B_i^0)^{-1}n'$

Equation Summary

Change weight of different facial expression

muscle-based approaches manipulate facial expressions

FACS (Facial Animation Coding System)

MPEG-4: Face Object

FDP (Facial Definition Parameters)

FAP (Facial Animation Parameters)

Lip Synching

Phonemes Visemes

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