The Research On Affective Virtual Human Based On HMM And 3D Face Model

Human Computer Interaction (HCI) is a key technology that all the countries put emphasis on in the 21st century, and it is a focus of competition in the information industry. Virtual Human synthesis technology has provided an important basis for the theory and technology in the realization of a harmonious HCI.In this paper, we study the affective state transition model, 3D face modeling and expression synthesis technologies and realize an affective virtual human system based on the three-dimensional model of the human face by computing. After studying the basic theory and method of HMM, We program the forward-backward arithmetic, Viterbi arithmetic and Baum-Welch arithmetic. We get the parameter of matrix of emotion transfer probability and of the vector of expression output probability. In emotion modeling, we present more detailed stimulatory signal and construct the initial matrix of emotion transfer probability, and it provide a method for complicating the stimulatory signal. As for the carrier of the emotion, we use Candide face model of 75 vertexes as the basic model to fit different 2D images. In the expression synthesis, we construct the face model under the environment of VC++ by using the triangular grid and synthesize the expression by controlling the AUs (Action Units) which can synthesize most of the human expressions. Then we can synthesize many real-time expressions accurately.The experiment indicates that the emotion feedback simulated in this virtual human system measures up the rule of the human emotion behavior. This method can provide a feasible way to design for the better HCI environment.