语言过程中舌头的时空图谱和统计模型。

Pub Date : 2018-01-01 Epub Date: 2016-04-28 DOI:10.1080/21681163.2016.1169220
Jonghye Woo, Fangxu Xing, Junghoon Lee, Maureen Stone, Jerry L Prince
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引用次数: 15

摘要

利用电影磁共振成像(MRI)对说话过程中舌头运动的统计建模提供了舌头结构和运动之间关系的关键信息。为了研究群体中舌头形状和运动的变异性,需要对主体间变异性进行一致的整合和表征。本文提出了一种基于平均运动模型和统计变化模式的语音时空图谱构建方法。该模型基于22名正常说话者的电影mri,由几个步骤组成,分别涉及空间和时间对齐问题。首先,将所有图像注册到一个共同的参考空间中,该空间被认为是舌头的中性休息位置。其次,生成每个个体相对于这个参考空间的舌形。第三,使用时间扭曲方法(评估了几种方法)将每个受试者的时间框架对齐到初始平均图像的共同时间序列。最后,通过对每个主题进行时间扭曲,每次生成新的平均图像,并在每个参考时间框架上使用主成分分析产生这些平均图像周围的形状统计,从而创建时空图谱。实验结果包括在图谱创建中各种参数和方法的比较,以及在一个样本短语中不同关键时间框架的最终变化模式的演示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Spatio-Temporal Atlas and Statistical Model of the Tongue During Speech from Cine-MRI.

A Spatio-Temporal Atlas and Statistical Model of the Tongue During Speech from Cine-MRI.

Statistical modeling of tongue motion during speech using cine magnetic resonance imaging (MRI) provides key information about the relationship between structure and motion of the tongue. In order to study the variability of tongue shape and motion in populations, a consistent integration and characterization of inter-subject variability is needed. In this paper, a method to construct a spatio-temporal atlas comprising a mean motion model and statistical modes of variation during speech is presented. The model is based on the cine-MRI from twenty two normal speakers and consists of several steps involving both spatial and temporal alignment problems independently. First, all images are registered into a common reference space, which is taken to be a neutral resting position of the tongue. Second, the tongue shapes of each individual relative to this reference space are produced. Third, a time warping approach (several are evaluated) is used to align the time frames of each subject to a common time series of initial mean images. Finally, the spatio-temporal atlas is created by time-warping each subject, generating new mean images at each time, and producing shape statistics around these mean images using principal component analysis at each reference time frame. Experimental results consist of comparison of various parameters and methods in creation of the atlas and a demonstration of the final modes of variations at various key time frames in a sample phrase.

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