并给出了利用半径描述子计算图像区域面积以及利用欧几里德距离判定边界相似度的方法。

A new method using Fourier radius descriptor to compute the area of image and using Euclidean distance to determine the similarity of boundary is educed too.

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结论：采用柔索约束、间隙元作为下颌骨及髁突的边界条件，可提高模型的相似性，为下颌骨的受力分析奠定基础。

Conclusion: Cable and gap elements are reasonable boundary conditions of the finite element model of mandible, which will improve the similarity of the model.

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对于目标中带孔或目标颜色信息和背景颜色信息相似的图像，单独根据边界信息或区域信息无法提取出准确的目标。

For some objects with holes, or their color information similar to the background's, object can't be extracted exactly only by boundary information or region information.

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