是一个数字图像处理的示例程序，将一个图像进行2维傅里叶变换，然后进行巴特沃斯高通和低通滤波。-Digital image processing is an example of a program, a two-dimensional Fourier transform of the image, and then Butterworth high-pass and low-pass filtering.

由长度，方差生成用于图像分割的高斯匹配模板，用于匹配滤波增强，做图像分割。(The Gauss matching template for image segmentation is generated by length and variance, which is used for matching and filtering enhancement and image segmentation.)