直方图均衡化是灰度变换的一个重要应用，它高效且易于实现，广泛应用于图像增强处理中。图像的像素灰度变化是随机的，直方图的图形高低不齐，直方图均衡化就是用一定的算法使直方图大致平和。-Histogram equalization is an important application of gray transform it efficient and easy to implement, widely used in image enhancement processing. Pixel grayscale image changes are random, the level of missing graphic histogram, histogram equalization is to use certain algorithms enable the histogram roughly peaceful.