二维傅立叶变换的Matlab实现，是利用图像处理软件对给
出的图像进行傅立叶变换处理。
自行设计一幅图像，验证离散傅立叶变换的性质，如：
频谱图中高频分量迅速衰减，可分离性，平移，周期性与共
轭对称性，旋转、线性和比例性，平均值。(The Matlab implementation of two-dimensional Fu Liye transform is based on image processing software. The image is processed by Fu Liye transform. An image is designed to verify the properties of the discrete Fu Liye transform, such as: The high frequency components in the spectrogram decay rapidly, separability, translation, periodicity and total. Yoke symmetry, rotation, linearity and proportionality, average.)