相交的两直线构成空间夹角，该角的投影角将随两直线的位置状态不同而改变。
The two intersected lines form a space Angle. The projective Angle of which will change with the change of the location of the two lines.
构建了基于计算机视觉的齿形链链板的测量系统，对直线和圆的边缘定位，提出了新的亚像素算法，计算了齿形链链板的销孔直径及圆度误差、链板节距和两直边夹角，对测量结果进行了误差分析。
The measurement system on chain board of tooth shape chain was established based on computer vision, and a new kind of sub-pixel algorithm for edge orientation of beeline and circle was put forward.
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