Sampling is accomplished by calculating the centre of gravity of the line segment in the tracking window, which is moved in order to track the curve.

采样通过移动采样窗口跟踪曲线，在采样窗口内求线段的重心来实现。

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Furthermore, a fractional linear parametric segment is defined; the necessary and sufficient conditions for which the curve is such a segment are also obtained. All the above condition...

还给出了它是分式线性参数段的充分必要条件，这些条件都仅与权系数有关。

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