一种新德中值滤波，在邻域内如果中心像素为最大值或最小值则用中值代替，否则保持原值不变，适合于红外图像的椒盐去噪。-A new DE median filter, in the neighbourhood if center pixels for maximum or minimum value is used instead of value, or keep the same original value, suitable for infrared image denoising salt &pepper.