A three-dimensional linear articulatory model of velum based on MRI data
A three-dimensional linear articulatory model of velum based on MRI data
复制标题
基于MRI数据的软腭三维线性关节模型
DOI：
10.21437/interspeech.2005-438
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. Badin
中科院分区：
文献类型：
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作者：
A. Serrurier;P. Badin
在鼻音研究的框架下，我们试图建立一个软腭的三维发音模型。收集了一名法国受试者的25组矢状面MRI图像，该受试者维持46个关节。从这些图像中手动绘制了帆的轮廓;然后将一个常见的3-D三角形网格拟合到这些轮廓上，以构成帆轮廓的3-D表示。这导致46个网格的5239顶点定义的三维坐标。为了开发不受舌头影响的软腭模型，分析首先限于不发生舌头-软腭接触的28个关节：发现通过主成分分析从这些数据中提取的第一成分可以解释膜的完整3-D形状的多达79%的方差，而第二个组成部分在发音运动方面没有意义。研究还发现，同一模型可以解释71%的变异的语料库的18个发音的舌-软腭接触发生。最后，它表明，一个单一的肉点的垂直坐标连接到下面对的膜是足够的预测完整的3-D形状的自由膜。
In the framework of studies on nasality, we have attempted to develop a 3-D articulatory model of velum. Sets of 25 sagittal MRI images have been collected for one French subject sustaining 46 articulations. Contours of the velum have been manually drawn from these images; a common 3-D triangular mesh has then been fitted to these contours in order to constitute 3-D representations of the velum outline. This resulted in 46 meshes of 5239 vertices defined by their 3-D coordinates. In order to develop a velum model free of the influence of the tongue, the analysis was first limited to the 28 articulations where no tongue - velum contact occurs: it was found that the first component extracted from these data by Principal Component Analysis can explain as much as 79% of the variance of the complete 3-D shape of the velum, while the second component was meaningless in terms of articulatory movements. It was also found that the same model could explain 71% of the variance for the corpus of the 18 articulations where tongue - velum contact occurs. It was finally shown that the vertical coordinate of a single flesh point attached to the downward face of the velum is enough to predict the complete 3-D shape of the free velum.