说明：  给出了两幅纹理图像，一幅为鹅卵石纹理图像，另一幅为沙石纹理图像。代码用于计算它们的频谱纹理特征。
(Gives two texture images, one for the cobblestone texture image, the other one for the sand texture image. Code to calculate their spectral characteristic texture.)