了解图像变换的实质和意义，熟悉傅立叶变换的性质，通过实验了解二维频谱的分布特点，掌握VC++编程实现数字图像的傅立叶变换及滤波处理的方法。-Understand the nature and meaning of the image transformation, the familiar Fourier transform nature through experiments to understand the characteristics of two-dimensional spectr