对bitmap格式图片进行中值滤波的一个演示程序，使用C语言编程，适合初学者理解图像处理的基本原理和方法。注意，图片格式限制为8位灰度照片。-Bitmap format pictures of the median filter of a demo program, use the C programming language, suitable for beginners to understand the basic principles of image processing, and m