A comparison of three-dimensional and two-dimensional analyses of facial motion.
A comparison of three-dimensional and two-dimensional analyses of facial motion.
复制标题
面部运动的三维和二维分析的比较。
作者：
M. Gross;C. Trotman;K. Moffatt
本研究的目的是比较使用三维（3-D）和二维（2-D）方法获得的面部运动幅度。在5个最大动画（微笑、唇包、鬼脸、闭眼和扑腮）中，15个面部标志的运动幅度使用基于视频的系统在3-D和2-D中进行量化。结果表明，在微笑动画中，三维振幅显著大于二维振幅，尤其是下面部的标志。在后一种情况下，二维振幅低估了三维振幅达43%。从一台相机获得的二维振幅比从多台相机获得的二维振幅差异更大。结果表明，二维分析可能不足以评估最大动画期间的面部运动，而三维分析可能更适合于检测面部功能的临床差异。
The purpose of this study was to compare the amplitude of facial motion obtained using three-dimensional (3-D) and two-dimensional (2-D) methods. The amplitude of motion of fifteen facial landmarks during five maximal animations (smile, lip-purse, grimace, eye closure, and cheek-puff) was quantified in 3-D and 2-D using a video-based system. Results showed that the 3-D amplitudes were significantly larger than the 2-D amplitudes, especially for landmarks on the lower face during the smile animation. In the latter instance, the 2-D amplitudes underestimated the 3-D amplitudes by as much as 43%. The difference between 3-D and 2-D amplitudes was greater for 2-D amplitudes obtained from one camera rather than from multiple cameras. The results suggest that a 2-D analysis may not be adequate to assess facial motion during maximal animations, and that a 3-D analysis may be more appropriate for detecting clinical differences in facial function.