Research On Key Techniques Of The Microscopic Simulation And Macroscopic Interaction On Virtual Human

The emergence of Virtual Reality Technology, an integrated trio ofimmersion-interaction-imagination, was accompanied by the development ofComputer Graphic in1980s. Based on those features, things in the real world could bereproduced in virtual environment by computer. In the process of reproducing realworld, the most challenging work is to simulate the real human in the virtualenvironment. In1990s, the concept of “Virtual Human” was first proposed with threecore disciplines, intelligence, behavior and interaction. There are notable progresses inthis research area. Simple modeling was developed to motion simulation while simplespeech reorganization was developed to perception of emotion. In this progress, thetechnical standards were gradually formed, which are modeling, response, life-sizecharacters, human-like appearance and activities in virtual environment. Withdeveloping of techniques, it is matured in appearance, motion and voice. But in someaspects, such as natural language and psychology, which are related to the perceptionand internal structure of human body, were researched in different scientific areas.Because of the difference in the understanding of virtual human concept and thedevelopment direction, there are various fields in the research of virtual human, whichformed many interdisciplinary branches. The most remarkable area is the cooperationbetween medical science and computer science.In this article, the starting point of the study was the interdisciplinary fieldbetween medical science and computer science. To improve the theory and keytechniques of virtual human in current progress of science and technology, threequestions were proposed: first, how to develop effective techniques for virtual humanconstruction and uniform metrics for virtual environment; second, how to seek thecommon concerns among different research areas to establish a shared and commonvirtual human system; third, how to design an architecture to integrate and takeadvantage of various research methods and techniques effectively in different disciplines.Regarding the microscopic and macroscopic research of virtual human as thestarting points, this study is based on three questions mentioned above and the basicconcept of virtual human, motivated by how to find the method for the construction ofvirtual human system. In this article, the current progress and the technical featureswere introduced; the key techniques of microscopic simulation and macroscopicinteraction were presented; a feasible architecture was proposed for virtual humansystem development with the key points of regulation. To verify the theory proposedabove and explore a new method for virtual human establishment, two aspects studywork were introduced. In microscopic simulation, VRKidney, a kind of VR softwareof3D human kidney was designed, programmed and implemented. Using VRKidney,a human kidney model was reconstructed by VKH serial sectioned image data set. Itcan simulate the basic process of renal excretion of drug. This is a probable methodfor the future research of physiological virtual human kidney. In macroscopicinteraction, the key point of the study is to analyze the impacts of virtual to the feelingand behavior of human beings, especially the communication and perception. Theresults were concluded by the analysis of survey data. Furthermore, the architectureand regulation for integrated virtual human was presented. Perceptibility was takenthe criteria for evaluating the various virtual human systems. Two virtual humansystems in this study were evaluated by their perceptibility.The innovative works of this study are as follow:1) Designed, developed and implemented VRKidney. The purpose of VRKidenyis to reconstruct virtual human kidney and simulate its physiological functions. Basedon VKH data set, VRKidney has integrated registration, segmentation, reconstructionand other image processing methods. It has advantages in registration, segmentationand interaction. Using VRKidney, the simple simulation of drug excretion in kidneycan be carried out.2) Introduced the new concept, UGC, into virtual human research.De-centralization is considered the new pattern of the knowledge acquisition andinformation distribution.Aclear distinction has been made between HCI and interpersonal interaction. The Internet has a merit of distribution. Using this merit, thetraditional conversational-centered mode of HCI has been improved tohuman-centered mode of interpersonal interaction.AVR system is developed basedon the human-centered mode and a survey has been finished. Through the survey, thepositive effect of interpersonal interaction on empathy cognition has been verified.3)An integrated architecture for virtual human has been presented. Atop-downdevelopment architecture is not suitable for an interdisciplinary study. The blackboardarchitecture can avoid its disadvantage. Using this architecture, the integrated virtualhuman system can be implemented as a complete, common and user-friendly system.The concept and the basic elements of this architecture have been defined clearly. Theregulation has been summarized.4) Propose the perceptibility as the criteria of evaluation a virtual human system.Whatever the starting points of the research or the various evaluating method indifferent subjects, it will improve the perceptibility to evaluate a virtual humanapplication by a common criteria.