中文说明：
图像经过二维傅立叶频谱分析后，用此函数可以求取频谱的环向、楔向特征。在图像分析中具有较大用途。
English Description：
After two-dimensional Fourier spectrum analysis, the circumferential and wedge features of the spectrum can be obtained by using this function. It is of great use in image analysis