图片的灰度化和去噪程序，灰度化可画出直方图，去噪使用中值去噪和均值去噪，中值去噪可循环多次，导入要改包名。-And the gray-scale image denoising procedures, and can be painted gray histogram, the use of denoising Denoising and mean de-noising, in denoising can be recycled many times, we have to change package names to import.