联合使用车底阴影、边缘信息、轮廓对称、灰度对称、水平线对称等车辆先验知识，提出一种基于特征的车辆检测方法。
Prior knowledge of the vehicles, such as shadows underneath the vehicles, rich edge information, contour symmetry, gray level symmetry, horizontal line symmetry and etc, is combined.
在人脸任意位置下，利用PCA自动确定人脸纵方向，采用网格配准方法提取对称面和对称轮廓线；
The vertical direction of face is determined by the PCA at the random pose. Based on surface registration, the symmetrical surface and symmetrical profile are extracted.
获得的光谱谱线轮廓具有典型的对称性线型，测得的谱线半宽度为3.2千兆赫。
The obtained profile of spectral line has a typical and symmetrical shape of line. The line width (FWHM) was measured to be 3. 2 GHz.
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