中文说明：
从原始图像产生噪声图像，使用db1执行2层小波，使用wpbmpen进行全阈值选择，采用硬阈值和软阈值处理方式,保存低频,进行图像降噪，并绘制各分解系数图像。
English Description：
The noise image is generated from the original image. Db1 is used to perform 2-layer wavelet, wpbmpen is used to select the full threshold, hard threshold and soft threshold are used to process, low frequency is saved, image denoising is carried out, and each decomposition coefficient image is drawn.