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ABSTRACT

Designing affective user interfaces involving expressive characters raises several questions. The system should be able to display facial expressions of complex emotions as dynamic and realtime reactions to user's inputs. From a cognitive point of view, designers need to know how the user will perceive the dynamics of these facial expressions as a function of his/her input. We aim at evaluating if users can perceive different expressive profiles of a virtual character by manually controlling its expressions and observing its reaction to his/her input. This paper describes our platform that enables a virtual character to display blended facial expressions of emotions as realtime continuous reactions to users' gesture input. We explain the techniques underlying the computation of intermediate facial expressions of emotion, and their control in the 3D space PAD (Pleasure, Arousal, Dominance) using gesture input. Preliminary results of a perceptive study show the potential of such an approach for assessing the dynamics of the perception of emotional expressions during gesture interaction with virtual characters endowed with different expressive profiles.

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INDEX TERMS

Primary Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)

General Terms:
Algorithms, Design, Human Factors

Keywords:
expressive agent, facial expressions, realtime interaction