Analysis of textile materials often includes measurement of structural anisotropy or directional orientation of textile object systems.To that purpose the real-world objects are replaced by their images,which are analyzed,and the results of this analysis are used for decisions about the product(s).Study of the image data allows to understand the image contents and to perform quantitative and qualitative description of objects of interest.This study deals particularly with the problem of estimating the main orientation of fiber systems.The methods we consider are based on the two-dimensional discrete Fourier transform combined with the method of moments.