Method for controlling color changes of virtual human face

Abstract

The invention discloses a method for controlling color changes of a virtual human face. The method comprises the following steps: firstly, acquiring a three-dimensional human face grid model; secondly, establishing a mathematical model for face color changes; thirdly, dividing a human face into a forehead, a left cheek, a right cheek, an apex of nose and a chin to determine an area range controlled by face characteristic points, selecting an area central point with clear face color changes as a characteristic point, dividing area ranges of color changes around the characteristic points, taking faces of different models as reference, and selecting a round shape or an elliptical shape to carry out area superposition; and finally, carrying out calculus of interpolation for parameters betweentwo given frames to generate a parameter value of an intermediate frame. Human face characteristic points defined in MEPG-4 are used, and the action range of each characteristic point is divided, so that the universality of the model is improved; and through changing color values of the characteristic points, color changes of a point in an influence range on the periphery of the point are driven,so that a number sequence model is simplified, and the operation amount is greatly reduced. By adopting an interframe interpolation algorithm, smooth transition of color changes can be realized, and three-dimension of color changes of the virtual human face is improved.

Description

technical field [0001] The invention relates to a method for controlling the color change of a human face, in particular to a method for controlling the color change of a virtual human face. Background technique [0002] Three-dimensional facial animation is an important part of computer animation research, mainly studying how to truly imitate human facial expressions and movements. There are many ways for facial models to express emotions. In addition to facial expressions and local body movements, facial color changes are also an important aspect of expressing emotions. However, research on the computer expression of emotions, that is, what kind of facial color should be used to express a certain emotion, and whether the color will change, etc., is still very rare. However, the change of facial color in the emotional expression of virtual human is an essential research content, which will make the emotional expression of virtual human more realistic and meet the increasi...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing technology, such as cumbersome modeling process, large amount of calculation, poor versatility, and reduced sense of reality caused by uneven color changes, the present invention provides a method for controlling the color change of a virtual human face. The change law of face color under different emotions is counted, and a new face color parameter model based on GPU is further proposed.

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