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Expressive Emotional ECA. Catherine Pelachaud Christopher Peters Maurizio Mancini. Expressive Emotional ECA. Emotion behavior modeling: Signals Temporal course of signals Expressive qualities Often in ECA systems: only modeling of signals is considered 6 ‘universal’ expressions.

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expressive emotional eca
Expressive Emotional ECA
  • Catherine Pelachaud
  • Christopher Peters
  • Maurizio Mancini
expressive emotional eca1
Expressive Emotional ECA
  • Emotion behavior modeling:
    • Signals
    • Temporal course of signals
    • Expressive qualities
  • Often in ECA systems:
    • only modeling of signals is considered
    • 6 ‘universal’ expressions
large variety of facial expressions kollias et al
Large variety of facial expressions (Kollias et al)
  • Archetypal expressions modeling using FAPs MPEG-4
  • Estimation of the range of variations of FAPs in archetypal expressions
  • Intermediate expressions: rule-based computational model based on
    • Whissell’s representation:
      • Activation, evaluation,
    • Plutchik’s angular measure
laban movement analysis
Laban Movement Analysis
  • 5 major components:
    • Body: part of the body in used
    • Space: description of the directions and paths of motion
    • Shape: changing forms of the body
    • Effort: dynamics of the body moves
    • Relationship: modes of interaction with oneself, others and the environment (facing, contact…)
  • Textual and symbolic language of movement description
emote badler et al
EMOTE (Badler et al)
  • EMOTE model for Effort and Shape
  • Based on Movement Observation Science
  • Laban Movement Analysis
  • Computational model of Effort and Shape components
effort
Effort
  • Four motion factors: space, weight, time, flow
    • Space
    • Weight
    • Time
    • Flow
  • Each factor ranges from:
    • Indulging in the quality
    • Fighting against the quality
effort1
Effort
  • Space: indirect  direct
    • Waving away bugs  pointing to a particular spot
  • Weight: light  strong
    • Feather movement  punching
  • Time: sustained  sudden
    • Stretching  grabbing a falling object
  • Flow: free  bound
    • Waving widely  moving in slow motion
shape
Shape
  • Three distinct qualities of change in the form of movement:
    • Shape flow: mover’s attitude toward the changing relationship among body parts
    • Directional movement: mover’s intent to bridge the action to a point in the environment
    • Shaping: mover’s carving or molding attitude with the environment
shape1
Shape
  • Three dimensions:
    • Horizontal: spreading  enclosing
      • Opening arms to embrace  clasping someone in a hug
    • Vertical: rising  sinking
      • Reaching for something in a high shelf  stamping the floor with indignation
    • Sagittal: advancing  retreating
      • Reaching out to shake hand  Avoiding a punch
expressive communicative gestures hartmann et al
Expressive Communicative Gestures (Hartmann et al)
  • Expressivity parameters:
    • Spatial: amplitude of movement
    • Temporal: duration of movement
    • Power: dynamic property of movement
    • Fluidity: smoothness and continuity of movement
    • Repetitiveness: tendency to rhythmic repeats
    • Overall Activation: quantity of movement across modalities
  • Expressivity modeling: modal and intermodal
emotional modeling
Emotional Modeling
  • Carmen's Bright IDEAS ( Stacy Marsella, USC)
  • Interactive drama
  • Agent exhibits gestures based on their emotional states and personality traits
fantasya ana paiva inesc
FantasyA (Ana Paiva, Inesc)
  • Role-playing game
  • The emotion detected from user drives the behavior of one of the agents in the video game
sentoy ana paiva inesc
SenToy (Ana Paiva, Inesc)
  • SenToy is a tangible interface device, used to influence emotional behaviour in FantasyA
  • SAFIRA: EU project
behavior modeling
Behavior Modeling
  • Facial expression:
  • Use facial analysis techniques/motion capture to look at:
    • Value of facial animation parameters (muscular contraction, FAP…)
    • Pattern of movement for a given parameter
    • Relation of facial animation parameters within a same expression
    • Coarticulation of movements between expressions
gesture
Gesture
  • Gesture specification often based on sign language gesture specification:
    • Hand description
    • Palm orientation
    • Wrist position
    • Movement: wrist, elbow, finger…
  • Parameters characterizing quality of movement: Laban, sub-set…?
  • Parameters act on overall animation (Emote) or on gesture phases (preparation, stroke, …)?
behavior
Behavior
  • Gaze:
    • Direction, gaze length, mutual gaze, ratio of gaze avoidance/gaze look at
  • Body:
    • Body posture, overall movement quality
  • Voice:
    • Paralinguistic parameters
    • Text
signals analysis generation
Signals analysis/generation
  • Use analysis method to:
    • Get information on parameters
    • Multimodal integration
    • Signals synchrony across modalities
    • Build computational model for generation
  • Get the expressive quality of behavior
  • Signals generation should not be done on one frame only but on a temporal interval
conclusion
Conclusion
  • Emotion is shown through:
    • Signals
    • Their temporal course
  • Which parameters to look at? Which are the perceptually relevant ones?
  • How to describe:
    • The signals?
    • Their evolution through time?
    • Correlation between modalities?
conclusion1
Conclusion
  • Relation between intensity of emotion and behaviors?
    • Selection of behaviors
    • Quality of behaviors
    • Duration of behaviors
    • Behaviors across modalities