中值滤波的基本原理是把数字图像或数字序列中一点的值用该点的一个邻域中各点值的中值代替，让周围的像素值接近的真实值，从而消除孤立的噪声点。-The basic principles of the median filter is the value of digital image or sequence of numbers in a neighborhood of the point value of the median instead, so that the surrounding pixel values ​ ​ close to the true value, thereby eliminating isolated noise points.