second-order feature的意思|示意

Second, in order to extract motion data of each facial part from a video stream, this dissertation studies multiple facial feature tracking algorithms.

为了从视频流中提取基于人脸面部特征的运动数据，本文研究了人脸多特征跟踪算法。

The second order effects of the whole structure and its members, geometric imperfections and residual stress as well as the feature of semi-rigid connections can be taken into account in this method.

该方法能够考虑结构及构件的二阶效应、几何缺陷和残余应力等多种非线性因素的影响，还可以考虑连接的半刚性性能。