小波变换后的插值方法，经过调试成功，可放心使用的！在db4后用的插值方法！-Wavelet transform of the interpolation methods, after successful commissioning, can rest assured that the use of! In the interpolation method used after db4!

将图像进行二维傅立叶变换，选取一定数量大系数，其余置零，然后还原图像。(The image is a two-dimensional Fu Liye transformation, select a certain number of coefficients, the rest to zero, and then restore the image.)