针对3D动画设计对人脸表情动态变化的三维数据信息的需求,设计了人脸表情动态采集系统.首先,采用标记光栅和空间映射法构建了人脸测量模型;设计了标记光栅图,并给出了利用相位图获取特征矩形的方法.然后,通过光栅上的特征矩形位置信息将测量得到的相对相位转化为绝对相位,再利用空间映射法获取三维坐标点信息.最后,进行了精度验证和人脸测量实验.测量了一个(220±0.01)mm标准半球的直径,平均值为219.95 mm,5次直径拟合的均方差为0.48 mm;5次测量中,三维数据点同标准球面距离的均方差为0.28～0.46 mm.对一名实验人员面部表情进行了测量实验,仅用一幅带有特征矩形的变形光栅图即完成了对人脸表情的三维数据动态采集,所获得的三维造型真实,数据信息丰富,获取速度快.%With the need of 3D animation design for the 3D facial expression data dynamically, a 3D facial experession acquiring system was designed. Firstly, a new model was constructed by using a feature grating pattern and a space mapping method. Then,a feature grating pattern was designed, and the extraction method of a feature rectangle was provided. Furthermore, the relative phase was translated into an absolute phase by using the information of feature rectangle, and the three-dimensional world coordinate information was obtained by the space mapping method. Finally, the tests on accuracy verification and facial measurement were performed. A standard hemispheroid with (220 ± O. 01)mm in diameter was measured five times, and the results show that the average of the fitting diameter is 219.95 mm, mean square error is 0.48 mm, and the mean square error of the distance between 3D points and spherical surface arrange is 0.28-0.46 mm. Moreover, the face with different expressions of a student was measured by the system,and the results indicate that the 3D data can be acquired by the system with only one fringe pattern and a vivid profile of the face is shown.
展开▼
