说明：  对分别添加了椒盐噪声（密度为0.03）和高斯白噪声（均值为0，方差为0.03）的cameraman.tif图像，利用三种方法进行去噪，计算去噪前后图像的峰值信噪比，显示原始图像、加噪图像和去噪图像，并对实验结果进行分析。
(When salt and pepper noise (density 0.03) and Gauss white noise (mean 0, variance 0.03) are added, respectively cameraman.tif Image, using three methods to denoise, calculate the peak signal-to-noise ratio of the image before and after denoising, display the original image, plus noise image and denoise image, and analyze the experimental results.)