【Key words】 non-stationary signal； time-frequency representation； parametric basis； adaptive signal decomposition； adaptive time-frequency distribution； Gaussian function； linear chirp； time-shear； frequency-shear； noise； instantaneous frequency；
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采用水平集方法描述结构的拓扑及其变化，使用紧支径向基函数对计算区域的水平集进行插值以得到参数化的水平集方法。
The level set method was adopted to describing the structural topology and its change, and the compactly supported radial basis function was introduced to getting the parametric level set method.
参数曲线的保形性与生成它的基函数的规范化全正性有关。
Shape preservation of parametric curves is associated with normalized total positivity of its basis functions.
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