直方图均衡化是一种最常见的间接对比度增强方法，通过使用累积函数对灰度值进行调整以实现对比度的增强。-Histogram equalization is one of the most common indirect contrast enhancement method by using the cumulative function of gray value " adjustment" in order to achieve contrast enhancement.

实现直方图均衡化，不使用matlab自己的函数。-Realize the histogram equalization, without the use of matlab functions of their own.