Tien TRAN-THUONG

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An Abstract Animation Model for Integrating SMIL
Basic Animations With Multimedia Document
Tien TRAN-THUONG Cécile ROISIN
OPERA Research Project
INRIA Rhône-Alpes
Zirst - 655 avenue de l'Europe - Montbonnot -
38334 Saint Ismier Cedex - France e-mail
tien.tran_thuong_at_inrialpes.fr cecile.roisin_at_inria
lpes.fr
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Multimedia document modeling
Declarative approach for specifying multimedia
document
Multimedia document model Content, Temporal,
Spatial, Link, Animation
Medias / Multimedia database
Multimedia document specification
Multimedia document
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Animation modeling

• An animation model is defined by (f, v, a, o, t)
• animator function (f), values (v), target
  attribute (a)
• target object (o)
• timing (t).
• Two approaches for creating animations
• Programming ? high expressive power but
  difficult,
• Declarative ? lower expressive power but easier
  for the author
• Modeling for declarative animation definition

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• Objectives of the animation model
• Specifying animations,
• Reutilization of animation,
• Simplifying maintenance of multimedia documents.
• Our approach
• Abstract animation definition,
• Independence between media target (o) and
  animation definition,
• Independence with rendition context (t)

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Ex. 1 transitions between images
O1
O2
O3
O4
O5
O6
time
t1
t2
t3
t8
t9
t10
t11
t4
t5
t6
t7
t12
Playing sequentially a list of images with
transition animations between two consecutive
images

• Animation modeling (f, v, a, o, t) two animation
  types for the modification of the alpha color
  attribute
• v V1 (0, 1) from transparent to visible, V2
  (1, 0) from visible to transparent
• flinear aalpha oO1..O6 tt1..t12.

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Specification with HyTime, MHEG and SMIL
Up 1
Up 2
Up 3
Up 4
Up 5
Up 6
Down 1
Down 2
Down 3
Down 4
Down 5
Down 6

• The animation specification can be specified
  thought the models
• HyTime a modifier (v, f, a, o) is projected on a
  time t
• Upi((0,1, f, a, Oi), ti) Downi((1,0, f, a,
  Oi), ti1) , where i1..6
• MHEG an action (v, f, a, t) is referenced to an
  object o
• Upi((0,1, f, a, ti), Oi) Downi((1,0, f, a,
  ti1), Oi)
• SMIL a basic_animation (v, f, a, t) is included
  into or referenced to an object o
• Upi((0,1, f, a, ti), Oi) Downi((1,0, f, a,
  ti1), Oi)

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Ex. 2 MADEUS characters motion
Spline path
Moving a sequence of characters on a same path

• Animation modeling (f, v, a, o, t) where
• v 45,350158,260383,440608,260832,440945,350
  
• fspline aposition oM,A,D,E,U,S
  tt1..t6
• In MHEG, HyTime and SMIL, the author has to
  specify 6 animations for each character object
  (v, f, a, Oi, ti), where i1..6.

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Why actual models provide no abstract
specification ?

• HyTime a modifier (v, f, a) referring to one
  object o is projected on a concrete time t.

• MHEG an action (v, f, a, t) defined directly on
  a concrete time refers to an object o.

Object
Object
Ref.
Ref.
Action class
Object modification


modifier
modifier
action
action
time
Projectors

• for only one object and
• in a concrete time

time

• for only one object

• SMIL a basic_animation (v, f, a, t) included
  into or referred to an object o has the same
  problems as the action of MHEG.

Object

time
animateMotion
animate
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• No abstraction animation specification implies
• Redundancy,
• No reutilization,
• Tedious and hard editing work.

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Animation Definition

• Abstract extension of SMIL animation model

Our abstract model
SMIL model
((f, v, a, t), o) ? A (f, v, a, ï)

• same SMIL semantic function animations
  fdiscrete, linear, paced, spline and basic
  animations set set, animate, animateColor,
  animateMotion,
• abstraction A(f, v, a, ï) where ï is an
  abstract interval 0,1,
• several objects can refer to the same animation
  (o1, t1), (o2, t2) refers to A.
• time projection when the abstract animation (f,
  v, a, ï) is referred by the object (o, t) the
  abstract interval ï is projected on the concrete
  time t.

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Abstract Animation Reutilization

• Example the uses of the abstract animation A(f,
  v, a, ï) by two object contexts (O1, t1), (O2,
  t2)
• (O1, t1, A)
• (O2, t2, A)

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Mapping the abstract time (ï) into several
concrete times (ti)

• The abstract time ï0,0.2,0.8,1 is mapped on
  two real times t1begin5, dur8 and
  t2begin15, dur10

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Ex. 1 transitions between images

• Define just two abstract animations
• UpAlpha (linear, 0,1, alpha, 0,1)
  DownAlpha (linear, 1,0, alpha, 0,1)
• Syntax

ltanimate idUpAlpha calcModelinear
values0,1 attributealpha keytime0,1/gt
ltanimate idDownAlpha calcModelinear
values1,0 attributealpha keytime0,1/gt

• Referencing

O1
O2
O3
O4
O5
O6
time
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Ex. 2 MADEUS characters motion

• Define just one abstract animation
• MadeusPath (spline, 45,350158,260 ,
  position, 00.20.40.60.81)
• Syntax
• ltanimateMotion idMadeusPath calcModespline
  values45,350158,260 keyTime00.20.40.6
  0.81/gt

• Animation referencing

M
A
D
E


time
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• Example 1
• the author has to defined two abstract
  animations
• UpAlpha (linear, 0,1, alpha, 0,1)
• DownAlpha (linear, 1,0, alpha, 0,1)
• Syntax
• ltanimate idUpAlpha calcModelinear
  values0,1 attributealpha keytime0,1/gt
• ltanimate idDownAlpha calcModelinear
  values1,0 attributealpha keytime0,1/gt
• ltimg idO_1 gt
• ltanchor begin0s dur3s animateRefUpAlpha/
  gt
• ltanchor begin10s dur1s animateRefDownAlph
  a/gt
• lt/imggt
• ltimg idO_2 gt
• ltanchor begin0s dur3s animateRefUpAlpha/
  gt
• ltanchor begin15s dur1s animateRefDownAlph
  a/gt
• lt/imggt

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• Example 2
• the author has to defined just one abstract
  animation
• MadeusPath (spline, 45,350158,260 ,
  position, 00.20.40.60.81)
• Syntax
• ltanimateMotion idMadeusPath calcModespline
  values45,350158,260 keyTime00.20.40.6
  0.81/gt
• lttext idM_text gt ltanchor begin2s
  dur10s animateRefMadeusPath/gtMlt/textgt
• lttext idA_text gt ltanchor begin3s
  dur10s animateRefMadeusPath/gtAlt/textgt
• lttext idD_text gt ltanchor begin4s
  dur10s animateRefMadeusPath/gtDlt/textgt

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See also http//opera.inrialpes.fr/people/Tien.T
ran-Thuong/Welcome.html