说明：  傅里叶变换是一种信号处理中的有力工具，可以帮助我们将图像从空域转换到频域，并提取到空域上不易提取的特征。但是经过傅里叶变换后，图像在不同位置的频度特征往往混合在一起，但是Gabor滤波器却可以抽取空间局部频度特征，是一种有效的纹理检测工具
(Fu Liye transform is a powerful tool in signal processing, which helps us transform images from airspace to frequency domain and extract features that are not easy to extract in airspace. But after Fourier transform, the frequency characteristics of images are mixed in different locations. However, Gabor filters can extract local spatial frequency characteristics, which is an effective texture detection tool.)