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Recent advances on virtual human synthesis

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Science in China(Series F) 2009年第5期52卷 741-757页

作者： XIA ShiHong WANG ZhaoQi Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

virtual human is a digital representation of the geometric and behavioral property of human beings in the virtual environment generated by computer. The research goal of virtual human synthesis is to generate realistic human body models and natural human motion behavior. This paper introduces the development of the related researches on these two topics, and some progresses on example based human modeling and motion synthesis, and their applications in Chinese sign language teaching, computeraided sports training and public safety problem studying. Finally, some hot research topics in virtual human synthesis are presented.

关键词： virtual human human body modeling dynamics inverse kinematics

The Skin Deformation of a 3D virtual human

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International Journal of Automation and computing 2009年第4期6卷 344-350页

作者： Xiao-Jing Zhou Zheng-Xu Zhao School of Instrument Science and Engineering Southeast University Nanjing 210096 PRC School of Computing and Informatics Shijiazhuang Tiedao Institute Shijiazhang 050043 PRC

This paper presents a skin deformation algorithm for creating 3D characters or virtual human models. The algorithm can be applied to rigid deformation, joint dependent localized deformation, skeleton driven deformation, cross contour deformation, and free-form deformation （FFD）. These deformations are computed and demonstrated with examples and the algorithm is applied to overcome the difficulties in mechanically simulating the motion of the human body by club-shape models. The techniques described in this article enables the reconstruction of dynamic human models that can be used in defining and representing the geometrical and kinematical characteristics of human motion.

关键词： Free-form deformation （FFD） skin deformation virtual human rigid deformation virtual reality.

Automatic segmentation of virtual human organ based on improved color similarity coefficient

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Automatic segmentation of virtual human organ based on impro...

Forecasting display technique of human in network virtual environment

大连理工大学生物医学工程学会研讨会

作者：刘斌大连理工大学机械工程学院CAD研究所

＜正＞Along with the in-depth study of virtual human, human datasets with different territorial race have been released in many countries. As the first stage of virtual human research, studying on visualized virtual human is the focus in many countries. To obtain the actual 3-D models of human’s organ, fast and exact segmentation approaches for color images are the necessary conditions. An improved segmentation approach is utilized in this paper. It is often made use of in the color object searching for vision system of soccer robot. The swift and automatic segmentation of serial color images for virtual human’s organ is realized. It provided potent support to the 3-D reconstruction research of visualized virtual human.

关键词： virtual human color image segmentation color space color similarity

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Journal of Harbin Institute of Technology(New Series) 2001年第3期8卷 207-211页

作者：吴葳张晶 Beijing Univ. of Aero. and Astron. Beijing 100083 China

The simulation of human in the distributed virtual environment is different from the simulation of vehicle. Due to the human’s many joints, to implement the real time performance of the interaction between the virtual human and the environment, the quantity of information broadcasted in the network will be increased. So with the growing of the quantity of virtual human added to the network, the network burthen would augment rapidly. Therefore, for the simulation of virtual human this paper divides organically the motion parts of the body, which makes those body parts that often interact with the environment are described according to the joints while other parts are described according to the action information. Simultaneity, this paper adopts Dead Reckoning to reduce the quantity of information needed by maintaining the reality motion of virtual human. The experiment indicates that the forecasting display technique can efficiently reduce the network burthen and enhance the interaction of virtual human.

关键词： distributed forecasting display virtual environment virtual human

Empathic Responses of Behavioral-Synchronization in human-Agent Interaction

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Computers, Materials & Continua 2022年第5期71卷 3761-3784页

作者： Sung Park Seongeon Park Mincheol Whang Savannah College of Art and Design SavannahGA31401USA Sangmyung University Seoul03016Korea

Artificial entities,such as virtual agents,have become more pervasive.Their long-term presence among humans requires the virtual agent’s ability to express appropriate emotions to elicit the necessary empathy from the users.Affective empathy involves behavioral mimicry,a synchronized co-movement between dyadic pairs.However,the characteristics of such synchrony between humans and virtual agents remain unclear in empathic interactions.Our study evaluates the participant’s behavioral synchronization when a virtual agent exhibits an emotional expression congruent with the emotional context through facial expressions,behavioral gestures,and voice.Participants viewed an emotion-eliciting video stimulus(negative or positive)with a virtual agent.The participants then conversed with the virtual agent about the video,such as how the participant felt about the content.The virtual agent expressed emotions congruent with the video or neutral emotion during the dialog.The participants’facial expressions,such as the facial expressive intensity and facial muscle movement,were measured during the dialog using a camera.The results showed the participants’significant behavioral synchronization(i.e.,cosine similarity≥.05)in both the negative and positive emotion conditions,evident in the participant’s facial mimicry with the virtual agent.Additionally,the participants’facial expressions,both movement and intensity,were significantly stronger in the emotional virtual agent than in the neutral virtual agent.In particular,we found that the facial muscle intensity of AU45(Blink)is an effective index to assess the participant’s synchronization that differs by the individual’s empathic capability(low,mid,high).Based on the results,we suggest an appraisal criterion to provide empirical conditions to validate empathic interaction based on the facial expression measures.

关键词： Facial emotion recognition facial expression virtual agent virtual human embodied conversational agent empathy human-computer interaction

human Centered Design in Multi-agent virtual Environment

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Computer Aided Drafting,Design and Manufacturing 2007年第2期17卷 49-57页

作者： WANG Zhao-hui ZHENG Guo-lei ZHU Xin-xiong School of Mechanical Engineering ＆ Automation Beijing University of Aeronautics and Astronautics Beijing 100083 China

The efficient and reliable human centered design of products and processes is a major goal in manufacturing industries for numerous human factors must be taken into account during the entire life cycle of products. A multi-agents intelligent design system is presented for manufacturing process simulation and products＇ ergonomic analysis. In virtual design environment, the virtual human with high-level intelligence performs tasks＇ operation autonomously and shows optimum posture configuration with ergonomic assessment results in real time. The functions are realized by intelligent agents architecture based on a modem approach derived from fuzzy multi-objects decision-making theory. A case study is presented to demonstrate the feasibility of the suggested methodology.

关键词： virtual human fuzzy multi-objective decisions making multi-agents system autonomous behavior

Creating Autonomous, Perceptive and Intelligent virtual humans in a Real-Time virtual Environment

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Tsinghua Science and Technology 2011年第3期16卷 233-240页

作者：刘渭滨周亮邢薇薇刘幸奇袁保宗 Institute of Information Science Beijing Jiaotong University Beijing Key Laboratory of Advanced Information Science and Network Technology School of Software Engineering Beijing Jiaotong University

Creating realistic virtual humans has been a challenging objective in computer science research for some time. This paper describes an integrated framework for modeling virtual humans with a high level of autonomy. The framework seeks to reproduce human-like believable behavior and movement in virtual humans in a virtual environment. The framework includes a visual and auditory information perception module, a decision network based behavior decision module, and a hierarchical autonomous motion control module. These cooperate to model realistic autonomous individual behavior for virtual humans in real-time interactive virtual environments. The framework was tested in a simulated virtual environment system to demonstrate the ability of the framework to create autonomous, perceptive and intelligent virtual humans in real-time virtual environments.

关键词： virtual human autonomous behavior motion planning obstacle avoidance character animation behavior decision