中文说明： 图像信号在产生、传输和记录过程中，经常会受到各种噪声的干扰，由于其严重地影响了图像的视觉效果，因此，在进行边缘检测、图像分割、特征提取、模式识别等工作之前，采用适当的方法减少噪声(即：进行图像噪声的滤波)，是一项非常重要的预处理步骤。对图像滤波的要求是，既能滤除图像中的噪声又能保持图像的细节。由于噪声和图像细节的混叠，所以在图像滤波中，图像的去噪与细节的保留往往是一对矛盾。图像滤波是图像处理中非常重要的技术环节，至今仍是图像处理领域的研究热点。
English Description：
Image signal is often interfered by various noises in the process of generation, transmission and recording. Because it seriously affects the visual effect of the image, it is a very important preprocessing step to reduce the noise (i.e. filtering the image noise) by using appropriate methods before edge detection, image segmentation, feature extraction and pattern recognition. The requirement of image filtering is that it can not only filter out the noise in the image, but also keep the details of the image. Due to the aliasing of noise and image details, image denoising and detail preservation are often contradictory in image filtering. Image filtering is a very important technology in image processing, and it is still a research hotspot in the field of image processing.