projection table

By using stereographic projection of each point group, all symmetry operation and generating operation of the point groups are listed, and group multiplication table of maximal proper point group 822 is filled in.

运用八方晶系各点群的极赤投影图，列出了各点群的所有对称操作；填出了固有点群822的群乘表。

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And then characters are segmented, after image obtain tilt table correction and adaptive binary, the mobile window projection method is used for the characters segmentation, effectively reduce the noise influence.

紧接着对获得的车牌图像进行倾斜校正和自适应二值化处理，利用提出的移动窗口投影法对字符进行分割，有效的减小噪声的影响。

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