1）　　对给定的待处理图像统计其直方图，求出

2）　　根据统计出的直方图采用累计分布函数做变换

求变换后的新灰值度。

3）用新灰值度代替旧灰值度，求出 。

-1) given the pending image statistics, the histogram obtained 2) According to the statistics of the histogram of the cumulative distribution function do transform transformation of the new gray value of the degree. 3) to replace the old with the new gray value of the degree of gray value of the degree of, find.