Publications by Junghyun Ahn | EPFL Graph Search

Evaluating the Sensitivity to Virtual Characters Facial Asymmetry in Emotion Synthesis

The use of expressive Virtual Characters is an effective complementary means of communication for social networks offering multi-user 3D-chatting environment. In such context the facial expression channel offers a rich medium to translate the on-going emot ...

Taylor & Francis2017

Asymmetric facial expressions: revealing richer emotions for embodied conversational agents

Ronan Boulic, Daniel Thalmann, Junghyun Ahn, Stéphane Gobron

In this paper, we propose a method to achieve effective facial emotional expressivity for embodied conversational agents by considering two types of asymmetry when exploiting the Valence-Arousal-Dominance representation of emotions. Indeed, the asymmetry o ...

Wiley-Blackwell2013

An NVC Emotional Model for Conversational Virtual Humans in a 3D Chatting Environment

Ronan Boulic, Daniel Thalmann, Junghyun Ahn, Stéphane Gobron, Quentin Silvestre

This paper proposes a new emotional model for Virtual Humans (VHs) in a conversational environment. As a part of a multi-users emotional 3D-chatting system, this paper focus on how to formulate and visualize the flow of emotional state defined by the Valen ...

Springer Berlin Heidelberg2012

Within-Crowd Immersive Evaluation of Collision Avoidance Behaviors

Ronan Boulic, Daniel Thalmann, Junghyun Ahn, Nan Wang

In this paper, we first present our crowd simulation method, Trajectory Variant Shift (TVS) based on real pedestrian trajectories re-use. We detail how to re-use and shift these trajectories to avoid collisions while retaining the liveliness of captured da ...

ACM2012

An Event-Based Architecture to Manage Virtual Human Non-Verbal Communication in 3D Chatting Environment

Ronan Boulic, Daniel Thalmann, Junghyun Ahn, Stéphane Gobron, Quentin Silvestre

Non-verbal communication (NVC) makes up about two-thirds of all communication between two people or between one speaker and a group of listeners. However, this fundamental aspect of communicating is mostly omitted in 3D social forums or virtual world orien ...

Springer Berlin Heidelberg2012

Conveying Real-Time Ambivalent Feelings through Asymmetric Facial Expressions

Ronan Boulic, Daniel Thalmann, Junghyun Ahn, Stéphane Gobron

Achieving effective facial emotional expressivity within a real-time rendering constraint requests to leverage on all possible inspiration sources and especially from the observations of real individuals. One of them is the frequent asymmetry of facial exp ...

Springer Berlin Heidelberg2012

Long Term Real Trajectory Reuse Through Region Goal Satisfaction

Ronan Boulic, Daniel Thalmann, Pascal Fua, Junghyun Ahn, Stéphane Gobron, Quentin Silvestre, Horesh Beny Ben Shitrit, Mirko Raca

This paper is motivated by the objective of improving the realism of real-time simulated crowds by reducing short term collision avoidance through long term anticipation of pedestrian trajectories. For this aim, we choose to reuse outdoor pedestrian trajec ...

Springer Berlin Heidelberg2011

An Interdisciplinary VR-Architecture for 3D Chatting with Non-verbal Communication

Daniel Thalmann, Junghyun Ahn, Stéphane Gobron, Quentin Silvestre

The communication between avatar and agent has already been treated from different but specialized perspectives. In contrast, this paper gives a balanced view of every key architectural aspect: from text analysis to computer graphics, the chatting system a ...

Eurographics Association2011

CYBEREMOTIONS – Collective Emotions in Cyberspace

Daniel Thalmann, Junghyun Ahn, Stéphane Gobron

Emotions are an important part of most societal dynamics. As with face to face meetings, Internet exchanges may not only include factual information but may also elicit emotional responses; how participants feel about the subject discussed or other group m ...

2011

No peanut! Affective Cues for the Virtual Bartender

Junghyun Ahn, Stéphane Gobron

The aim of this paper are threefold: it explores methods for the detection of affective states in text, it presents the usage of such affective cues in a conversational system and it evaluates its effectiveness in a virtual reality setting. Valence and aro ...

2011

From Sentence to Emotion: a real-time 3D graphics metaphor of emotions extracted from text

Daniel Thalmann, Junghyun Ahn, Stéphane Gobron

This paper presents a novel concept: a graphical representation of human emotion extracted from text sentences. The major contributions of this paper are the following. First, we present a pipeline that extracts, processes, and renders emotion of 3D virtua ...

Springer-Verlag2010

Real-time textured volume reconstruction using virtual and real video cameras

Daniel Thalmann, Clément Marx, Junghyun Ahn, Stéphane Gobron

Reconstructing objects in three dimensions (3D) has always been one of the primary tasks in the domain of computer graphics (CG). Succeeding in this task in real-time, including texture reconstruction, and with very low-cost hardware is the challenge prese ...

2010

Asymmetrical Facial Expressions based on an Advanced Interpretation of Two-dimensional Russells Emotional Model

Daniel Thalmann, Junghyun Ahn, Stéphane Gobron, Quentin Silvestre

This paper proposes a novel method to compute emotional parameters based on Russell's 2D circumplex diagram for simulating and visualizing asymmetric facial expressions. Based on a large set of emotion coordinates allocated by psychologists, we have select ...

2010

Automated Motion LoD with Rigid Constraints

Daniel Thalmann, Junghyun Ahn

Motion LoD (Level of Detail) is a preprocessing technique that generates multiple details of captured motion by eliminating joints. This LoD technique is applied to movie, game or VR environments for the purpose of improving speed of crowd animation. So fa ...

2010