中文说明：因为有些图像是在非均匀光照下形成的，所以为了使图像显的更为清晰，可以对图像进行顶帽变换，基本思想就是对图像进行开运算处理，进而使图像更为清晰。
English Description：
Because some of the image is in the form of non-uniform illumination, so in order to make the image more clear, the images can be used in top hat transformation, the basic idea is to open the process of the image, and then make the image clearer.