本程序基于matlab平台，向一张图片中分别添加了三种不同的噪声，并用四种不同的去噪方法进行去噪，并比较了去噪的效果(Based on the MATLAB platform, this program adds three different kinds of noise to a picture, and uses four different denoising methods to denoise, and compares the effect of denoising)