该代码是关于图像处理中的图像均衡的内容，利用直方图均衡化之后，原来比较少像素的灰度会被分配到别的灰度去，像素相对集中， 处理后灰度范围变大，对比度变大，清晰度变大，所以能有效增强图像。-The code is a graphic equalizer content on image processing, after histogram equalization, less original pixel gray gray will be assigned to another go, the relative concentration of pixels, larger post-processing grayscale range, contrast becomes large, sharpness becomes large, it is possible to effectively enhance the image.