该方法简单、通用，是处理方差平稳随机信号的一般方法，且无需趋向性的任何先验知识。

This method, simple and commonly used, is the general method to process the signals, and any priori knowledge of the trend component is not need.

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计量资料差异性比较采用单因素方差分析，非正态分布资料经正态转换后再作统计学处理。

Difference of measurement data was compared with single factor analysis of variance. After normal transformation, the non-normal distribution data were conducted with statistical disposal.

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首先，对机动车号牌图像进行大小、灰度方差、灰度均值的标准化处理。

First, we standardized the size, variance of gray scale and mean value of gray scale of the motor vehicle plate images.

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