A facial model and animation techniques for animated speech
A facial model and animation techniques for animated speech
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发表时间：
2001
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通讯作者：
Rick Parent;Scott A. King
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作者：
Rick Parent;Scott A. King
创建动画语音需要一个能够代表人类面部在语音过程中经历的无数形状的面部模型，以及一种在正确的时间产生正确形状的方法。我们提出了一个面部模型，旨在支持动画语音。我们的模型具有高度可变形的嘴唇模型，该模型被移植到输入面部几何结构上，为创建嘴唇形状和高质量的嘴唇渲染提供必要的几何复杂性。我们提供了一个高度可变形的舌头模型，可以代表舌头的形状在讲话过程中的经验。我们添加牙齿、牙龈和上颚几何形状来完成内口。为了更真实的皮肤运动，我们考虑下面的软组织和硬组织。为了减少处理时间，我们分层变形的面部表面。我们还提出了一种方法来动画的面部模型随着时间的推移，以创建动画语音。我们使用一个基于轨迹的动画系统，每个轨迹有一个面部模型参数，每个参数可能有多个轨迹。轨迹包含曲线的控制点，该曲线描述参数随时间变化的值。我们允许许多不同类型和阶数的曲线以不同的方式组合。为了更真实的语音，我们开发了一个协同发音模型，定义视位曲线，而不是一个单一的位置。这把视位视为声道的动态形状，而不是静态形状。
Creating animated speech requires a facial model capable of representing the myriad shapes the human face experiences during speech and a method to produce the correct shape at the correct time. We present a facial model designed to support animated speech. Our model has a highly deformable lip model that is grafted onto the input facial geometry providing the necessary geometric complexity for creating lip shapes and high-quality lip renderings. We provide a highly deformable tongue model that can represent the shapes the tongue experiences during speech. We add teeth, gums, and upper palate geometry to complete the inner mouth. For more realistic movement of the skin we consider the underlying soft and hard tissue. To decrease the processing time we hierarchically deform the facial surface. We also present a method to animate the facial model over time to create animated speech. We use a track-based animation system that has one facial model parameter per track with possibly more than one track per parameter. The tracks contain control points for a curve that describes the value of the parameter over time. We allow many different types and orders of curves that can be combined in different manners. For more realistic speech we develop a coarticulation model that defines visemes as curves instead of a single position. This treats a viseme as a dynamic shaping of the vocal tract and not as a static shape.