本论文针对视觉描述中的对称性特征检测的重要问题：图像中的具有对称性特征的点集提取，镜像对称图像的对称轴的定位等问题进行了深入研究。

This paper focuses on the principal problems in symmetry detection such as the selection of the symmetric points in image and the location of reflectional symmetry axes and deeply research in them.

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方法：视头颅为一整体，根据镜像对称性原理，制成由面弓、滑动定位尺、轨限、耳杆和额托等附件构成的颧骨复合体骨折定量复位校正仪。

Methods: According to the mirror imaging symmetry principle, we assumed the skull as an entirety and design the localizer to measure the projections of zygoma and zygomatic arch.

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