为了实现模糊控制器的标准化设计，模糊决策采用Mamdani（ min- max）决策法，解模糊采用重心法（centroid）。最后经过精确化计算，得到的结果就是PID参数的修正值k p、k i、d。
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本文定义了样品之间的距离，采用重心法确定类与类之间的距离。
In this paper, distance between two samples and distance between two classes were defined.
采用重心法确定干涉条纹调制度的最大值位置，并以此作为零光程差位置。
The centrobaric method was used to determine the position with the maximum modulation value of fringes and the position was used as the point of zero light path difference.
本文对光栅投影条纹图像进行预处理，提出采用重心法提取条纹中心线位置，可以获得亚像素级的精度；
The method of barycenter, which can obtain the sub-pixel accuracy to abstract the fringe-centerlines, is presented in this paper after preprocessing the picture using grating projection.
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