以上是一维二维傅里叶正变换及其源代码，包括余弦离散傅里叶变换-The above is a one-dimensional two-dimensional Fourier transform and its source code, including the cosine discrete Fourier transform

在MATLAB环境中，进行图像的离散傅里叶变换和离散余弦变换 在MATLAB环境中，进行图像的离散小波变换，观察子带对重建图像的影响，理解小波变换的多分辨率特性(In the MATLAB environment, the image of the discrete wavelet transform, observe the sub-band on the reconstruction of the image, understand the multi-resolution characte