The edge position, visible area and the mean of gray value of flame also be discussed by analyzing the flame images.

分析火焰数字图像，讨论了火焰锋面位置、火焰面积、平均灰度的计算方法。

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According to the changes of gray value range of images pollute by salt and pepper noise, this paper proposed an improved weighted mean filtering algorithm.

根据椒盐噪声污染图像灰度值取值范围的变化，提出了一种改进的加权均值滤波算法。

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

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。

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