Аннотация:The absolute value and argument of discrete Fourier transform (DFT) coefficients are investigated by
analyzing images test objects and structural defects in single crystals, which are theoretically calculated from modified
Indenbom-Chamrov equations and experimental data. The role of the argument of DFT coefficients is demonstrated in
revealing the peculiarities of the contrast generated by structural defects and their reliable identification and localization
in the bulk of a single crystal.