Remember it's never going to be perfect due to lenses, distortion and tracking accuracy of the features.

请记住，透镜、畸变和特征点的跟踪精度将使它永远不会完美。

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In tracking, the area of face contour distortion were searched by the method of particle filter, and the face contour parameters were solved.

同时，利用非线性滤波方法在人脸轮廓的变形区域内进行搜索，求解人脸轮廓参数，进行人脸轮廓跟踪。

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State feedback pole assignment technique is used to gain fast tracking of the output voltage, and a repetitive control is designed to reduce voltage distortion under nonlinear loads.

系统利用状态反馈极点配置获得了电压跟踪控制的快速性，利用重复控制较好地抑制了非线性负载工况下的电压畸变。

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