The Animation Of Lip Curve Based On MPEG-4

Constant acceleration of science and technology has brought about greater demand for highly qualified life. It had been enough for us to communicate with each other by sound and words before. But now, what the people need is to communicate by"face to face", so the research of facial animation was known as hot spots gradually. Realistic facial animation is through theory and methods of modeling, romance and real-time animation to realize the realistic real-time facial animation emulation, and use widely in a variety of domains of virtual reality, video production and video communications. Lip animation is an important part of facial animation, so my work is focus on Lip animation.First of all, this paper introduced the research background and content, and then reviewed the existing lips modeling methods, lips animation, and the relevant definition on face and lips in MPEG-4. And classified these methods, compared the advantages and disadvantages of these methods, and at last introduced my work.There are two aspects of work in this paper.Firstly, we definite a new lip model, and name it model LAP which controls the lip shape with 28 LAP, and we draw the lip with the curves of Cardinal. For a given lip curve, we get the LAP of the Basic Viseme through compute the displacement of feature points, and then use those LAP to control the shape of a lip, to be a very realistic effect of lip animation, the lip animation is driven by text. Taking into account the promotion of LAP, We have considered extending more use of the model, so measured a set of standard LAP values of Basic Viseme from lots of persons.On the other hand, this paper will have proposed a method of applying the standard LAP values of Basic Viseme to different lips. We have got the standard LAP on basic Viseme of different people, for any given closed lip curve , Firstly we compute"the unit of the LAP", and then compute the new LAP of every viseme to adapt to the arbitrary lip shapes, finally the lip is drove by Bopomofo text. During lip variation, interpolation is used to realize the transition and at the same time we take into account of the influence from the anterior shape of the lip to the after shape of the lip, so the animation is smooth and continuous.The model and the application of the LAP method we propose in this paper is simple and easy to promote and apply, it can be applied in a virtual host, movies, games and advertising areas.