【Key words】 Chaotic measuring； Noise-reduction； Symbolic dynamics； Symbolic distance； Chaos synchronization； Coupling map；
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Traditional level set active contours represent their contours by the zero level sets of the level set functions, which is set to be signed distance functions.
传统水平集活动轮廓模型采用传统水平集函数的零水平集来表示模型的轮廓线,其中传统水平集函数被设置为关于其零水平集的符号距离函数。
参考来源 - 基于活动轮廓模型的图像分割·2,447,543篇论文数据，部分数据来源于NoteExpress
文中的曲面或用参数方程表达或用符号距离函数表达。
In this paper, the surface is presented with a parameterized equation or a signed distance function.
符号距离函数重构是水平集方法中必不可少、且相当费时的步骤。
The reconstruction of signed distance function (SDF) is an imperative and time-consuming step in level set method.
针对如何快速求取空间点到STL模型表面有符号距离这一问题，提出一种基于线性八叉树的参考球方法。
For fast calculating the signed distance from spatial point to STL model, a reference ball method was put foward based on linear octree.
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