通过对离散傅立叶逆变换的分析，我们得到一个线性方程组，它的解可以作为序列的谱。
Analyzing inverse DFT, we obtained a system of linear equations, whose solution can be taken as the spectrum of the data series.
然后再将序列化的轮廓点映射到用户交互绘制的一条草图线上，通过解线性方程组求出变形后各顶点的新坐标。
Then the serialized silhouette points are projected to a line sketched by the user interactively and the new coordinate of vertices are achieved after solving the linear equations.
序列变换是依据外推法的原理，通过序列的核来插值序列的某些项，最后求解线性方程组得到的。
Sequence transformation is based on the principle of extrapolation, interpolating certain items by the kernel of the sequence, and finally is obtained by solving linear equations.
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